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Cummins/Onan KTA50-G3 Engine

The Cummins/Onan KTA50-G3 is a 50 L 16-cylinder turbocharged engine rated at 1500 rpm, producing up to 1470 kW. It powers generator sets from Cummins/Onan, Everdigm and Katolight, including the 1005 DFLC, 1120 DFLC, C1250 D2R and C1400 D5. It holds 204 L (215.6 US qt) of oil and 400 L (105.7 gal) of coolant.

Also known as: Cummins KTA50-G3

Part of the Cummins/Onan KTA50 engine family — 19 variants share parts & fitment.

50.0 L

Displacement

Cylinders

1500 rpm

Rated speed

1470 kW

Gross power

On this pageSpecs Generator sets Maintenance FAQ Service intervals Torque & specs Fluids Fault codes Procedures Wiring

Engine specifications

Oil capacity	204 L (215.6 US qt)
Coolant capacity	400.0 L
Displacement	50.0 L
Cylinders	16
Aspiration	Turbocharged
Rated speed	1500 rpm
Gross power	1470 kW

Generator sets powered by this engine

Shared across brands: Cummins/Onan, Everdigm, Katolight

Cummins/Onan 1005 DFLC Cummins/Onan 1120 DFLC Cummins/Onan C1250 D2R Cummins/Onan C1400 D5 Cummins/Onan DFLCCummins/Onan DFLC-4493470Cummins/Onan DFLC-5618743Cummins/Onan KTA 50 G3Cummins/Onan KTA-50G3 Cummins/Onan KTA50 Everdigm EDG-1250C Katolight D1250FNZ4 Katolight D1250FRZ4 Katolight D1250FSZ4

How to read your Cummins/Onan engine serial & model number →

Common problems

Over Current 1471
Low Coolant Level 197
Engine cranks but fails to start
Cause: Empty fuel tank, fuel leaks, or plugged fuel lines
Fix: Check for empty fuel tank, fuel leaks, or plugged fuel lines and correct as required.
WEAK BATTERY — Warning 232
Cause: Indicates battery voltage drops below 60% of nominal for two seconds, during starting. Discharged or defective battery.
Fix: See Warning message 230, LOW DC VOLTAGE.
Weak Battery 1442
UNDER FREQUENCY — Shutdown 313
Cause: Indicates that engine speed has dropped below 90% of nominal for 10 seconds. NOTE: Five seconds before shutdown, a Load Dump signal is initiated.
Fix: Contact an authorized service center.
Under Frequency 1448
Too Long in Idle 2342
Speed/Hz Match 1469
Speed Signal Lost 121
Shutdown After Battle Short 1123
SHORT CIRCUIT — Shutdown 322
Cause: Indicates that generator output current has exceeded 175% of rated.
Fix: Contact an authorized service center.
Short Circuit 1445
REVERSE POWER — Shutdown 335
Cause: Indicates improper CT or PT phasing. (Non-parallel units only.)
Fix: Contact an authorized service center.
Remote Emergency Stop 1434

Compiled from service & troubleshooting documentation across every generator set that uses the Cummins/Onan KTA50-G3.

Maintenance schedule

Item	Spec	Capacity	Part #
Air filter	Air Cleaner - Throwaway Type		140-2098	Amazon eBay
Fuel filter			—
Oil filter			—
Battery			—
Belt	Decal - Caution Fan Drive & Lube Components Group Belt.		98-5347	Amazon eBay
Coolant		440.0 l	—
Oil		177.0 l	—
Spark plug			—

Pooled from every document that names this exact engine — confirm the interval and part number against your unit's serial number.

Service intervals

Item	Action	Hours	Months	Notes
Вентиляционные устройства генератора	Check	10 hr		10 часов / еженедельно
Весь агрегат	Test	10 hr		Включение минимум на час, предпочтительно с нагрузкой 50 %; 10 часов / еженедельно
Подключение вспомогательной клеммной коробки	Check	10 hr		10 часов / еженедельно
Уровень охладителя воды	Check	10 hr		10 часов / еженедельно
Уровень смазочного масла в двигателе	Check	10 hr		10 часов / еженедельно
Уровень топлива	Check	10 hr		10 часов / еженедельно
Уровень электролита в батарее	Check	10 hr		10 часов / еженедельно
crankcase oil	Change	50 hr		First service — Drain and replace the crankcase oil after the first 50 hours of operation on new generator sets (break-in)
Вентиляционный клапан топливного бака	Check	100 hr		100 часов / ежемесячно (положение отметки в таблице)
Все переключатели (в т.ч. двигателя)	Test	100 hr		100 часов / ежемесячно
Осадок в топливном баке	Drain	100 hr		100 часов / ежемесячно (положение отметки в таблице)
Отверстие и внутреннее пространство генератора	Clean	100 hr		Очистка сухим воздухом; 100 часов / ежемесячно
Соленоид подачи топлива	Check	100 hr		100 часов / ежемесячно
Уровень зарядки батареи гидрометром	Test	100 hr		100 часов / ежемесячно
Check Electrolyte Level (batteries)	Check	200 hr		At least every 200 hours of operation
Воздушный фильтр (у масляного – уровень масла)	Check	200 hr		200 часов / ежегодно
Все болты и гайки	Check	200 hr		Проверка и затягивание при необходимости; 200 часов / ежегодно
Все реле распределительной аппаратуры	Test	200 hr		200 часов / ежегодно
Кабельные контакты батареи	Clean	200 hr		200 часов / ежегодно; зачистка и смазка
Линии топлива, воздуха и выхлопная система на протечки	Check	200 hr		200 часов / ежегодно
Натяжение клиновидного ремня	Check	200 hr		200 часов / ежегодно
Плавкие предохранители и отключающие устройства	Check	200 hr		200 часов / ежегодно
Подшипники генератора	Lubricate	200 hr		200 часов / ежегодно
Проверка агрегата изготовителем	Inspect	200 hr		200 часов / ежегодно
Противовибрационные устройства	Check	200 hr		При наличии таковых; 200 часов / ежегодно
Смазочное масло	Change	200 hr		200 часов / ежегодно
Чистка всего агрегата и наружной поверхности панели управления	Clean	200 hr		200 часов / ежегодно
Чистота контакторов и контактов прерывателей	Check	200 hr		200 часов / ежегодно
Air cleaner element - restriction	Check	250 hr	6 mo	Replace air cleaner element as required
Air compressor air cleaner element	Replace	250 hr	6 mo	Cummins two-cylinder compressor
All belts	Check	250 hr	6 mo
Belt tension	Check	250 hr	6 mo	Measure in center span of pulleys; fan idler pulley design self-tensions
Belts	Check	250 hr	6 mo	Replace cracked or frayed belts
Change Crankcase Oil and Filter	Change	250 hr	12 mo	If used for standby applications, change oil every 12 months or 250 hours, whichever comes first (footnote X6)
Coolant filter	Change	250 hr	6 mo	At each oil and filter change interval
Cooling fan	Check	250 hr	6 mo	Check for cracks, loose rivets, bent or loose blades
Cooling system additives (DCA4)	Check	250 hr	6 mo	Check concentration whenever coolant is added between filter changes
Crankcase breather tube/hose	Check	250 hr	6 mo	Remove and check internally for obstructions or sludge; clean or replace
Crankcase oil and filter	Change	250 hr	12 mo	Standby applications: change oil every 12 months or 250 hours, whichever comes first
DCA water filter	Change	250 hr	6 mo	Change filter or element at each B Check; service element may be changed at C Check if DCA-4L additive added at each B Check

Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.

Service specifications

Type	Item	Value	Unit	Condition
Clearance	Air cleaner nozzle distance from element	at least 1 (25)	inch (mm)
Clearance	Angular alignment T.I.R. limit	not more than .001	in per inch of radius	center of shaft to indicator axis
Clearance	Angular alignment maximum T.I.R.	0.001	inch per inch of radius (center of shaft to indicator axis)	measuring deflection to bolt heads
Clearance	Crankshaft end clearance	0.13 MIN / 0.51 MAX	mm
Clearance	Crankshaft end clearance	0.13 to 0.51	mm	engine mounted in unit
Clearance	Crankshaft end clearance — new maximum	0.014	inch	new
Clearance	Crankshaft end clearance — new maximum	0.015	inch	new
Clearance	Crankshaft end clearance — new maximum	0.017	inch	new
Clearance	Crankshaft end clearance — new maximum	0.043	inch	new
Clearance	Crankshaft end clearance — new minimum	0.004	inch	new
Clearance	Crankshaft end clearance — new minimum	0.005	inch	new
Clearance	Crankshaft end clearance — new minimum	0.006	inch	new
Clearance	Crankshaft end clearance — new minimum	0.007	inch	new
Clearance	Crankshaft end clearance — worn limit	0.018	inch	worn
Clearance	Crankshaft end clearance — worn limit	0.022	inch	worn
Clearance	Crosshead to valve spring retainer minimum clearance	0.020	inch
Clearance	Crosshead to valve spring retainer minimum clearance	0.025	inch
Clearance	Fan hub bearing end clearance	0.03 MIN / 0.15 MAX	mm
Clearance	Fan hub bearing end clearance	0.03 to 0.15	mm
Clearance	Float switch assembly float lift clearance below C-clip stop	1/8	inch (3 mm)	use a feeler gauge
Clearance	Generator-to-engine angular alignment (T.I.R.)	.001 in. per inch of radius (center of shaft to indicator axis), maximum	in	750 kW gensets and larger
Clearance	Injector plunger travel (3375004 Dial Indicator Kit)	0.304 ± 0.001	inch
Clearance	Injector plunger travel (3375004 Dial Indicator Kit)	0.308 ± 0.001	inch
Clearance	Injector plunger travel (dial indicator method)	0.187 ± 0.001	inch
Clearance	Injector plunger travel — NT-855 Big Cam (non Top-Step)	0.228	inch
Clearance	Injector plunger travel — aluminum rocker housing cold	0.179	inch	cold
Clearance	Injector plunger travel — cast iron rocker housing cold	0.175	inch	cold
Clearance	MPU sensor to gear tooth adjustment	back out one quarter turn	turn	after contacting gear tooth
Clearance	Thermostat seal installation depth	no more than 0.51	mm	below top of cast edge
Clearance	Turbocharger BB (RR-151) and (RR-153) end clearance	0.09 MIN / 0.13 MAX	mm
Clearance	Turbocharger BB bearing radial clearance - RR-151	0.75 MAX	mm	0.030 in
Clearance	Turbocharger BB bearing radial clearance - RR-153	0.55 MAX	mm	0.021 in
Clearance	Turbocharger axial end play - HC5A	0.05 MIN / 0.13 MAX	mm
Clearance	Turbocharger axial end play - HT7100	0.06 MIN / 0.16 MAX	mm
Clearance	Turbocharger axial end play - T18A	0.10 MIN / 0.23 MAX	mm
Clearance	Turbocharger compressor wheel radial clearance	0.003 to 0.033	inch
Clearance	Turbocharger end clearance	0.004 to 0.009	inch
Clearance	Turbocharger radial clearance	0.003 to 0.007	inch
Clearance	Turbocharger radial clearance compressor impeller - HC5A	0.15 MIN / 0.45 MAX	mm
Clearance	Turbocharger radial clearance turbine wheel - HC5A	0.20 MIN / 0.55 MAX	mm
Clearance	Turbocharger rotor end clearance	0.006 to 0.018	inch
Gap	Float switch lift to test open	1/8	inch	below C-clip stop
Gap	Heat exchanger zinc plug erosion limit A	approximately 19	mm	0.75 in; new 51 mm [2 in]
Gap	Heat exchanger zinc plug erosion limit B	approximately 6.4	mm	0.25 in; new 16 mm [0.625 in]
Gap	MPU sensor to flywheel ring gear tooth	back it out one quarter turn	turn	sensor threaded in until it just touches gear tooth
Other	AVR Droop setting	5	% at full load, 0 PF
Other	AVR voltage regulation (load regulation)	approximately ±0.5	% RMS
Other	Air cleaner element cleaning air pressure	30 (207)	psi (kPa)	low pressure compressed air through element from clean side
Other	Air compressor discharge carbon deposit thickness limit	2	mm	1/16 in
Other	Air discharge line maximum carbon deposit thickness	1/16	inch
Other	Air starting motor minimum air pressure	480	kPa
Other	Alternator belt tension	356	N	Burroughs tension gauge ST-1293
Other	Angular alignment maximum T.I.R.	.001 inches per inch of radius	in/in	center of shaft to indicator axis
Other	B+ output fuse	10	amp	F1, Base board, 12/24 volt
Other	Battery charging current	45	Amps
Other	Battery electrolyte specific gravity	1.260		at 80°F
Other	Battery specific gravity (high ambient, above 95F/35C)	1.225		recommended to reduce electrolyte loss
Other	Battery specific gravity (recharge threshold)	below 1.260
Other	Battery specific gravity - charge threshold (below this, charge battery)	1.215
Other	Battery specific gravity - fully charged (corrected)	1.260

Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.

Recommended fluids

Fluid	Grade	Standard	Ambient	Capacity	Notes
Coolant		Water should be clean, slightly alkaline with pH value range of 8.5 to 10.5			Maintain the Fleetguard DCA Water Filter on the engine; use permanent-type antifreeze with rust inhibitor additives in cold weather. 'Anti-leak' antifreezes are not recommended
Coolant	50 percent ethylene glycol / 50 percent water	Low-silicate antifreeze meeting ASTM D4985 (less than .10% silicate)			50/50 gives -34 F freeze point and 228 F boiling point; working range 40 to 60 percent antifreeze; use refractometer, not hydrometer; pre-charge 1.5 SCA units per gallon
Coolant	50/50 low-silicate antifreeze and quality water	ASTM D4985 (less than 0.10% silicate as Na2SiO5)			Must be pre-charged with supplemental coolant additives (DCA4) to 1.5 units per gallon; never below 1.2 or above 3 units per gallon. Do not use soluble oils.
Coolant	DCA-4L liquid additive				One bottle (P/N 3300858) per 10 gallons cooling system capacity; one bottle per 15-gallon capacity if methoxy propanol antifreeze is used; maintain a minimum of one DCA Unit per gallon
Coolant	soft water / E.G. / DCA mixture				Cooling system to be filled with soft water/E.G./DCA mixture (on-site review checklist).
Coolant	water/antifreeze mixture (permanent type antifreeze)	Clean, low mineral content water free of chloride, sulphate or acid			Mix water and antifreeze per supplier recommendation for lowest expected ambient temperature; do not use antifreeze containing anti-leak additives
Coolant	Смесь воды и антифриза 50/50; низкосиликатный антифриз	Добавка Cummins DCA4 или эквивалент			Вода чистая, без хлоридов, сульфатов и кислот, с pH от 8,5 до 10,5; при заполнении холодной системы остается 6 (максимум 8) % дополнительной емкости для расширения
Coolant	60 percent ethylene glycol / 40 percent water	Low-silicate antifreeze	-54°C to -32°C		Arctic specification coolant mixture for -32 to -54 C [-25 to -65 F]
Engine oil	Arctic oil, viscosity 10,000 mPa·s max. at -35 F [-35 C]	API Classification CC/SC or CC/CD; sulfated ash 1.85% by weight maximum			For ambient consistently below -13 F [-25 C] with no provision to keep engine warm
Engine oil	SAE 15W-40	API CE or CF4			Cummins Premium Blue or equivalent; CD or CD/SF acceptable where CE/CF4 not available; sulfated ash must not exceed 1.85 mass percent
Engine oil	SAE 5W-30 synthetic CE/SF	API CE or CF4	below -23°C		For ambient temperatures consistently below -23 C [-10 F] with no provision to keep engine warm
Engine oil	Synthetic lubricating oil	Appropriate API Service category and viscosity grade			Recommended where ambient temperature is consistently lower than -13 F [-25 C]; same oil change interval as petroleum based oil
Engine oil	SAE 10W (alternate single grade)	API CC/CD	-25°C to 0°C		Alternate oil grades, Table 3-3
Engine oil	SAE 10W-30	API CC (naturally aspirated); CC/CD (turbocharged); CC/SC (light-duty)	-25°C to 35°C		Recommended multigraded lubricating oil; Table 3-2
Engine oil	SAE 5W synthetic	API class CC/CD; sulphated ash content not exceeding 1.85 percent; pour point 9°F (5°C) below lowest expected temperature; viscosity 10,000 mPa.s maximum at -31°F (-35°C) and 4.1 mm2/s minimum at 212°F (100°C)	above -25°C		Recommended when ambient temperature is consistently below -13°F (-25°C) and there is no provision to keep the engine warm; do not use petroleum base 5W grade oil
Engine oil	multigrade / multiviscosity	API Class CC/CD; maximum sulphated ash content 1.85 percent	-25°C to 35°C		Specifications section lists ambient ranges -13°F to 95°F (-25°C to 35°C), 14°F (-10°C) and above, and 32°F (0°C) and above; single grade oil not recommended; do not mix oils of another classification or brand
Engine oil	SAE 20W (alternate single grade)	API CC/CD	-5°C to 20°C		Alternate oil grades, Table 3-3
Engine oil	SAE 20W-40	API CC/CD	above 0°C		32 F and above [0 C and above]
Engine oil	SAE 30 (alternate single grade)	API CC/CD	above 4°C		39 F and above [4 C and above]
Engine oil	SAE 40 (alternate single grade)	API CC/CD	above 10°C		50 F and above [10 C and above]
Fuel	ASTM No. 2 diesel	No. 2 D; blends of No. 2 D and No. 1 D below 0 C [32 F]			Viscosity must be kept above 1.3 cSt; maximum cloud and pour points 6 C [10 F] lower than ambient
Fuel	Diesel				Day tank fuel transfer pump maintains reservoir of diesel fuel in the day tank.
Fuel	No. 2 Diesel Fuel	ASTM D-445 viscosity 1.3 to 5.8 CentiStoke at 104 F [40 C]; cetane number 40 minimum; sulfur not to exceed 1% by weight; water and sediment not to exceed 0.1% by weight			No. 1 fuels or other fuels within listed specifications may be used
Fuel	No. 2 diesel				Engine will also operate on No. 1 fuel or other similar fuels if they meet certain specifications
Fuel	Дизельное топливо класса А1 или А2	BS 2869: Часть 1:1998 (класс А1); BS 2869: Часть 2:1998 (классы А2, С1, С2, D, E, F, G, H)			Топливо должно быть как можно более чистым, по возможности не содержать воды и загрязнений
Grease		MIL-G-3545, excluding sodium or soda soap thickeners			Drop point 350 F min.; worked penetration 250-300
Grease	Aeroshell No. 5 Lubriplate (type 180AA) or Moly-disulfide grease				For backside idler pivot arm bushings (Teflon bushings)
Grease	Kluber, type ASONIC GHY72			75.0 grams	P7 generator bearing re-lubrication grease fill quantity; fill period 4000-4500 hours. Must not be mixed with any other type.
Grease	Lithium based grease	Mobilux No. 2 or Shell Alvania R3		2.74 oz (81 ml)	Generator end bearing. Temperature range -22F to +248F (-30C to +120C). Grease should be equally divided between the bearing, bearing cap cavity, and bearing cartridge cavity.
Grease	Water pump type grease (Amoco Rykon Premium No. 2 / Chevron SRI / Exxon Unirex N2 / Shell Dolium R / Texaco Premium RB)				Fan idler pivot arm and front engine support lubrication

Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.

Fault codes

Code	Name	Meaning	Severity	Action
101	IDLE MODE	Engine operating in idle mode	Info	Remove ground from engine idle input to return to normal speed and voltage.
102	EMERGENCY STOP	Local or remote Emergency Stop activated	Shutdown	Pull button out or turn clockwise to pop out; move Run/Off/Auto switch to Off; press Reset; select Run or Auto. Reset only at PCC front panel.
121	SPEED SIGNAL LOST	Mag pickup speed indication is not being sensed.	Shutdown	Restart and check RPM on the digital display.
135	OIL PRESSURE SENSOR H	Engine oil pressure sender signal is shorted high.	Warning	Check sender/connectors/wires.
141	OIL PRESSURE SENSOR L	Engine oil pressure sender signal is shorted low.	Warning	Check sender/connectors/wires.
143	PRE-LOW OIL PRES	Engine oil pressure has dropped to an unacceptable level.	Warning	If critical loads, wait until next shutdown period and follow code 415.
144	COOL SENSOR HIGH	Engine coolant temperature signal is shorted high.	Warning	Check sender/connectors/wires.
145	COOL SENSOR LOW	Engine coolant temperature signal is shorted low.	Warning	Check sender/connectors/wires.
146	PRE-HIGH COOL TMP	Engine has begun to overheat.	Warning	Reduce load; check air inlets/outlets; follow code 151 if engine can be stopped.
151	HIGH COOLANT TEMP	Engine has overheated above the shutdown trip point.	Shutdown	Allow cool down; check coolant level, cooling airflow, fan belt, blower fan and circulation pumps.
197	LOW COOLANT LEVEL	Engine coolant level has fallen below the warning trip point.	Warning	Check coolant level and replenish if low; reset control.
200	LOW OIL PRESSURE	Engine oil pressure dropped to an unacceptable level	Warning	Follow 201 Low Oil Pressure procedure.
201	LOW OIL PRESSURE	Engine oil pressure below shutdown trip point	Shutdown	Check oil level, replenish if low, reset control and restart; contact authorized service center.
204	OIL PRES SENDER	Engine oil pressure sender not functioning correctly	Warning	Check sender connection; contact authorized service center.
210	LOW COOLANT TEMP	Engine coolant temperature 70 F (21 C) or lower	Warning	Check coolant heater power, fuse and cord; check coolant level and leaks.
211	HIGH COOLANT TEMP	Engine operating near cooling system capacity	Warning	Review 212 correction list; increase in load or higher ambient may cause shutdown.
212	HIGH COOLANT TEMP	Engine overheated; coolant above shutdown trip point	Shutdown	Cool engine; check coolant level, airflow obstructions and fan belt; reset and restart.
213	COOLANT SENDER	Resistance of coolant temperature sender out of range	Warning	Contact authorized service center.
214	LOW COOLANT LVL	Engine coolant level below trip point	Warning	Cool engine; check coolant level and leaks; reset control and restart.
215	LOW COOLANT LVL	Engine coolant level below trip point	Shutdown	Cool engine; check coolant level and leaks; reset control and restart. Shutdown will not occur in Idle mode.
220	MAG PICKUP	Mag pickup speed indication not sensed or does not match output frequency	Shutdown	Restart and check RPM on digital display; contact authorized service center.
221	FAIL TO CRANK	Possible fault with control or starting system	Shutdown	Clean and tighten battery cables; recharge or replace battery; contact service center.
222	OVERCRANK	Possible fuel system problem	Shutdown	Check fuel tank, leaks, plugged lines, fuel filter and air filter; reset control and restart.
223	OVERSPEED	Engine exceeded normal operating speed (2070 rpm @ 60 Hz; 1800 rpm @ 50 Hz)	Shutdown	Contact authorized service center.
224	FAIL TO SYNCHRONIZE	Generator set has not synchronized to the system bus within the allowable time frame.	Warning	Check governor system stability; adjust governing and synchronizer parameters; check fuel system.
226	FAIL TO CLOSE	Paralleling breaker has been given a signal to close, but has not closed properly.	Shutdown	Verify breaker charging mechanism; check close signal; verify auxiliary contact signals.
230	LOW DC VOLTAGE	Battery voltage below 24 VDC	Warning	Check battery charger fuse; recharge or replace battery; clean and tighten cable terminals.
231	HIGH DC VOLTAGE	Battery voltage exceeds 32 VDC	Warning	Contact authorized service center.
232	WEAK BATTERY	Battery voltage drops below 60% of nominal for two seconds during starting	Warning	See warning message 230 LOW DC VOLTAGE.
234	OVERSPEED	Engine has exceeded normal operating speed.	Shutdown	Check for large block load removal, flammable vapors or leaking turbocharger seals.
235	LOW COOLANT LEVEL	Engine coolant level has fallen below the shutdown trip point.	Shutdown	Check coolant level and replenish if low; reset control.
240	LOW FUEL - DAY	Day tank fuel supply running low	Warning	Check fuel supply and replenish as required.
241	LOW FUEL	Fuel supply running low	Warning	Check fuel supply and replenish as required.
250	EEPROM ERROR	PCC memory error; data corruption of critical operating parameters	Shutdown	Contact authorized service center.
251	EEPROM ERROR	PCC memory error; data corruption of noncritical operating parameters	Warning	Contact authorized service center.
252	EEPROM ERROR	PCC memory error; data corruption of noncritical operating parameters	Warning	Contact authorized service center.
260	CUSTOMER FAULT 1	Customer defined input closed to ground		Shutdown or warning preselected; message is editable; contact authorized service center.
261	GROUND FAULT	Customer defined input closed to ground		Shutdown or warning preselected; message is editable; contact authorized service center.
262	RUPTURE BASIN	Customer defined input closed to ground		Shutdown or warning preselected; message is editable; contact authorized service center.
263	HIGH GEN TEMP	Customer defined input closed to ground		Shutdown or warning preselected; message is editable; contact authorized service center.
270	PHASE ROTATION	The phase relationship between the generator set and the system bus is not matched.	Shutdown	Verify genset phase rotation matches bus; verify control wiring to bus PT module.
272	FIRST START	PowerCommand control is not receiving a proper signal from the system master first start sensor.	Warning	Verify Master First Start Sensor and interconnection wiring.
301	HIGH AC VOLTAGE	One or more phase voltages exceeded 130% of nominal, or 110% of nominal for 10 seconds	Shutdown	Contact authorized service center.
303	LOW AC VOLTAGE	One or more phase voltages dropped below 85% of nominal for 10 seconds	Shutdown	Contact authorized service center.
313	UNDER FREQUENCY	Engine speed dropped below 90% of nominal for 10 seconds	Shutdown	Load Dump signal initiated five seconds before shutdown; contact authorized service center.
320	OVERCURRENT	Generator output current exceeded 110% of rated for 60 seconds	Warning	Contact authorized service center.
321	OVERCURRENT	Generator output current exceeded 110% of rated; PCC time/current calculation initiated shutdown	Shutdown	Contact authorized service center.
322	SHORT CIRCUIT	Generator output current exceeded 175% of rated	Shutdown	Contact authorized service center.
330	OVERLOAD	Three-phase power output exceeds 105% of standby (or 115% of prime) rating	Warning	Load Dump output activated after five seconds; warning activated after 60 seconds; contact authorized service center.
335	REVERSE POWER	Improper CT or PT phasing (non-parallel units only)	Shutdown	Contact authorized service center.
337	LOSS OF EXCITATION	Alternator excitation system is improperly adjusted or has failed.	Shutdown	Check output voltage calibration, load sharing lines, and leading power factor loads.
359	FAIL TO START	Engine cranks but fails to start after last crank time.	Shutdown	Check fuel tank, leaks, fuel lines, fuel filter, air filter; check fuel solenoid and actuator.
415	LOW OIL PRESSURE	Engine oil pressure has dropped below the shutdown trip point.	Shutdown	Check oil level, lines and filters; replenish if low; reset control.
421	OIL TEMP	Engine oil temperature has exceeded the warning threshold.	Warning	Reduce load; check air inlets/outlets; check engine oil level.
441	LOW BAT VOLTAGE	Battery voltage supply to the control is approaching a low level.	Warning	Recharge or replace battery; check charger fuse, connections and DC alternator.
442	HIGH BAT VOLTAGE	Battery voltage supply is approaching a high level.	Warning	Check battery charger float level; check battery wiring/calibration.
1122	Rated/Idle Trans		Info
1123	SHUTDOWN AFTER BS	Shutdown fault occurred while Battle Short was enabled and then disabled.	Shutdown	Review Fault History and perform corrective action.
1124	DELAYED SHUTDOWN	Shutdown fault became active while Delayed Shutdown feature was enabled.	Warning	Review Fault History and perform corrective action.
1131	BATTLE SHORT ACTIVE	Control is in Battle Short mode.	Warning	Bypasses several critical fault shutdowns for emergency operation.
1311	Customer Input #1			Optional customer selection (e.g. Low Fuel Day Tank, Water In Fuel, Ground Fault). Programmable via service tool: enable/disable, status/warning/shutdown, active open/closed, display name.
1311, 1312, 1317, 1318	CUSTOMER INPUT #1 - #4	Optional customer-selected fault input is active.	Warning	Check external wiring and active input (closed/open) selection.
1312	Customer Input #2			See code 1311.
1313-1316	Network Fault 1 thru 4
1317	Customer Input #3			See code 1311.
1318	Customer Input #4			See code 1311.
1334	CRIT SCALER OR	Incorrect feature or calibration entered into control.	Shutdown	Reload correct calibration.
1335	NONCRIT SCALER OR	Incorrect feature or calibration entered into control.	Warning	Reload correct calibration.
1337	No Message		Info
1416	FAIL TO SHUTDOWN	Genset continues to run after shutdown command.	Warning	Check Battle Short feature enabled condition.
1417	POWER DOWN ERROR	Controller cannot power down.	Warning	Check for possible battery drain.
1433	EMERGENCY STOP	Local Emergency Stop.	Shutdown	Pull button out; move switch to O; press Fault Acknowledge/Reset; select Manual or Auto.
1434	REMOTE E-STOP	Remote Emergency Stop.	Shutdown	See code 1433 to reset.
1435	Engine Cold	Warning LED illuminates when engine jacket water coolant temperature falls below 70°F (21°C); per NFPA 110 requirement, indicates engine may not accept load within 10 seconds	Warning	Check coolant heaters for proper operation; other precautions may be necessary to warm engine before applying load
1438	FAIL TO CRANK	Engine failed to crank after PCC received a start signal.	Shutdown	Check starter, fuse F3, K4 relay, E-Stop switch and MPU circuit.
1442	WEAK BATTERY	Battery voltage at or below weak battery warning trip point during cranking.	Warning	See code 441 for corrective action.
1443	BATTERY FAILED	Dead battery - engine will not start.	Shutdown	See code 441 for corrective action.
1444	KW OVERLOAD	Generator output power exceeded 105% of genset rating.	Warning	Check load and load lead connections; check CTs.
1445	SHORT CIRCUIT	Generator output current has exceeded 175% of rated.	Shutdown	Check load and load lead connections.
1446	HIGH AC VOLTAGE	One or more phase voltages exceeded 130% of nominal.	Shutdown	Check fault simulation, load removal, threshold settings, Base board/generator.

Showing the first 80 of 133 codes.

Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.

Procedures

Adjustment of Mechanical Overspeed Switch adjustment

⚠ Do not break or remove the lockwire.

⚠ Do not use the ST-1224 if stop crank adjustment is required.

Tools: ST-1224 Tachometer drive adapter (2:1 ratio), tachometer, 1/16 inch hex allen wrench

Remove the tachometer drive adapter.
Install the ST-1224 in place of the standard drive adapter; connect the tachometer and overspeed stop switch to the ST-1224.
Start the engine and warm to operating temperature.
Set the engine speed to the appropriate overspeed switch set speed in Table 1-3 as indicated by the tachometer.
Remove the round head dust cover screw marked 2 from the top of the switch.
Insert a 1/16 inch hex allen wrench into the adjusting screw located just below the surface of the cover.
Turn the adjusting screw counterclockwise to lower the engine shut off speed; clockwise to raise it.
Replace the dust cover screw.
Reset the switch by pushing the reset button on top of the switch.
Replace the ST-1224 with the original drive adapter and reconnect the cables.

Aligning Generator with Engine (Angular Alignment) adjustment

⚠ Accidental starting of the generator set during this procedure presents the hazard of severe personal injury or death.

Tools: Dial indicator, Shims

Disconnect the negative (-) battery cable(s) before beginning.
Fasten a dial indicator to the generator shaft or cooling fan with the sensing point on the capscrew head or flat surface of the drive disc at the bolt circle diameter.
Bar the engine over in a clockwise rotation as viewed from engine flywheel; do not allow it to roll back on compression.
Determine the total indicator reading (T.I.R.) as the sum of the maximum positive and negative dial indicator readings over one revolution.
Measure the distance from the center of the generator shaft to the indicator measuring point.
Measure the distance from the generator side of the flex discs to the center of the generator mounting bolt.
Compare the distances; multiply this ratio times one half the T.I.R. to approximate the amount of shims to remove or add.

Alternator Belt Adjustment adjustment

⚠ Over-tensioning of alternator belts can result in premature accessory drive bushing wear and seal leakage.

Tools: GT-1293 Burroughs Tension Gauge

Loosen the alternator and adjusting link mounting capscrews.
Loosen the jam nuts on the adjusting screw.
Turn the adjusting screw clockwise to tighten the belt tension.
Check the belt tension with a gauge.
Tighten the jam nuts on the adjusting screw to 55 Nm [40 ft-lb].
Tighten the adjusting link and alternator mounting capscrews to 55 Nm [40 ft-lb].
Check the belt tension again.

Angular Alignment Procedure adjustment

⚠ Accidental starting of the generator set during this procedure presents the hazard of severe personal injury or death. Make sure to disconnect the negative (-) battery cable(s) before beginning.

Tools: Dial indicator, Wooden shims

Disconnect the negative (-) battery cable(s) before beginning.
Fasten a dial indicator to the generator shaft or cooling fan with sensing point on capscrew head or flat surface of drive disc at bolt circle diameter.
Bar the engine over in a clockwise rotation as viewed from engine flywheel; do not allow it to roll back on compression.
Record maximum positive and negative dial indicator readings as the engine completes one revolution.
T.I.R. equals the sum of the maximum positive and negative readings.
Maximum T.I.R. should not be more than .001 inch for each inch of radius.
Remove equal shims from under both generator mounting feet to lower the generator.

Angular Alignment Procedure (750 kW gensets and larger) adjustment

⚠ Accidental starting during this procedure presents hazard of severe injury or death

⚠ Do not bar engine over by prying on fan blade

Tools: dial indicator

Disconnect negative battery cable(s) before beginning
Fasten dial indicator to generator shaft or cooling fan, sensing point on capscrew head or drive disc flat surface
Bar engine over in clockwise rotation as viewed from flywheel, do not allow roll-back at end of travel
Record total indicator reading (T.I.R.) as sum of max positive and negative readings over one revolution
Calculate shim correction using ratio of generator shaft-to-indicator distance vs generator mounting bolt distance
Add or remove shims from both generator mounting feet as calculated

Angular Alignment Procedure (Generator to Engine) adjustment

⚠ Accidental starting during this procedure presents the hazard of severe personal injury or death.

⚠ Do not bar engine over by prying on fan blade.

Tools: dial indicator

Disconnect the negative (-) battery cable(s) before beginning.
Fasten a dial indicator to the generator shaft or cooling fan with sensing point resting on the drive disc capscrew head/flat surface at the bolt circle diameter.
Bar the engine over in a clockwise rotation as viewed from the engine flywheel; do not allow it to roll back on compression at the end of travel of each reading.
Record the total indicator reading (T.I.R.) as the sum of the maximum positive and negative dial indicator readings over one engine revolution.
Compare the measured T.I.R. to the maximum allowed (.001 in. per inch of radius from center of shaft to indicator axis); add or remove shims under the generator mounting feet to correct.

Axial Alignment Procedure (750 kW gensets and larger) adjustment

Tools: dial indicator

Check axial alignment only when objectionable vibration is present after angular alignment
Fasten dial indicator holding device to skid base/engine block/generator shell, sensor on generator shaft hub
Bar engine over clockwise through a couple of rotations, recording readings at eight equally spaced points
If out of tolerance, remove capscrews connecting drive discs and flywheel, mark discs, reposition holes 180 degrees
Reinstall capscrews and retorque; recheck alignment; try 30/60/90 degree repositioning if unchanged

Axial Alignment Procedure (Generator to Engine) adjustment

Tools: dial indicator

Fasten a dial indicator holding device to the skid base, engine block, or generator shell with the sensor point resting on the generator shaft hub.
Bar the engine over in a clockwise rotation through a couple of rotations, recording indicator readings at eight equally spaced points around the shaft diameter to obtain axial T.I.R.
Reduce the measured T.I.R. runout by one half if excessive vibration remains after angular alignment.

Crossheads - Adjustment adjustment

Tools: ST-669 Torque Wrench Adapter

Adjust the crossheads on the cylinder that has both valves closed.
Loosen the crosshead adjusting screw locknuts on the intake and exhaust valve crossheads.
Turn the adjusting screw out at least one turn.
Hold the crosshead down against its guide.
Turn the adjusting screw in until it touches the top of the valve stem but does not raise the crosshead.
Hold the adjusting screw and tighten the lock nut to the torque value.

Dipstick Calibration adjustment

⚠ The dipstick will break if the scribe mark is too deep.

Tools: scribe

Drain the oil from the pan.
Install the dipstick in the dipstick tube.
Use clean 15W-40 oil to fill the oil pan to the specified low level.
Remove the dipstick and scribe a mark across the dipstick at the oil level. Mark the low level with an L.
Install the dipstick and add additional oil to the specified full level.
Remove the dipstick and scribe a mark across the dipstick at the oil level. Mark the high oil level with an H.

Gain Adjustment adjustment

Close the main line circuit breaker and apply approximately 1/4 of the rated load.
Make sure the engine speed is constant.
Turn the GAIN potentiometer clockwise slowly until the engine speed is not constant.
Slowly turn the potentiometer counterclockwise until a constant speed is achieved, then an additional 1/2 division.

Governed Speed Adjustment adjustment

For 60 Hz full load, set engine no-load governed speed to 60.0 Hz (1800 RPM) isochronous, 61.8 Hz (1854 RPM) for 3% droop, or 63.0 Hz (1890 RPM) for 5% droop.
For 50 Hz full load, set engine no-load governed speed to 50.0 Hz (1500 RPM) isochronous, 51.5 Hz (1545 RPM) for 3% droop, or 52.5 Hz (1575 RPM) for 5% droop.
Use the SPEED ADJUST potentiometer on the engine instrument panel for fine speed adjustments of less than ±100 RPM.

Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.

Voltage reconnection

Voltage	Phase	Connection	Leads	Notes
		12 lead generator sets	Load wires are routed through the CTs	Reconnectable gensets (12 leads) have dual secondary CTs (3 pins); CT wire 2/3 to pin 2 (high voltage) or pin 3 (low voltage).
		6 lead	6	Generator end is not 12 lead reconnectable; 6 lead only
		6 lead generator sets	Generator output leads are routed through the CTs	Non-reconnectable gensets (6 leads) have single secondary CTs (2 pins).
		Cummins PowerCommand generic AC Reconnect Wiring Diagram 625-2755 (Rev. D) and 625-3100 (Rev. F)		Applies to models DFAA, DFAB, DFAC, DFBF, DFCB, DFCC, DFEB, DFEC, DFFB, DFGA, DFGB, DFJA, DFJB, DFJC, DFJD, DFLB, DFLC, DFLD, DFMB (625-2755) and models DFAA-DFMB plus DFCE, DFED, DQAA, DQAB, DQBA, DQBB (625-3100).
	A	CT21 – U load leads	A phase	CT dot must face the generator; CT terminal 1 connects to metering circuit; terminal 2/3 connects to ground.
	A (U)	Bus PT module TB1 A	bus A phase	Bus PT module A39.
	A (U)	CT21	U load leads (A phase)	CT dot must face the generator; CT terminal 1 connects to metering circuit, terminal 2/3 to ground.
	B	CT22 – V load leads	B phase	CT dot must face the generator; CT terminal 1 connects to metering circuit; terminal 2/3 connects to ground.
	B (V)	Bus PT module TB1 B	bus B phase	Bus PT module A39.
	B (V)	CT22	V load leads (B phase)	CT dot must face the generator; terminal 1 to metering circuit, terminal 2/3 to ground.
	C	CT23 – W load leads	C phase	CT dot must face the generator; CT terminal 1 connects to metering circuit; terminal 2/3 connects to ground.
	C (W)	Bus PT module TB1 C	bus C phase	Bus PT module A39.
	C (W)	CT23	W load leads (C phase)	CT dot must face the generator; terminal 1 to metering circuit, terminal 2/3 to ground.
	N	Bus PT module TB1 N	bus neutral	Bus PT module A39.
110 V - 120 V L-N	1	Single phase, 2-wire		PTC module jumper locations
190 V - 240 V L-L	3	Three phase		Use PTC module 0300-5382-01; 50/60 Hz
200 V - 240 V L-L	1	Single phase, 3-wire		PTC module jumper locations
220/380	3	4 LEAD WYE	4
2400/4160	3	6 LEAD WYE	6
277/480	3		12	Generator end is 12 lead reconnectable and has PMG permanent magnet generator
277/480	3	4 LEAD WYE	4
347/600	3	4 LEAD WYE	4
380 V - 600 V L-L	3	Three phase		Use PTC module 0300-5382-02; 50/60 Hz
high voltage genset		12-lead CT secondary wire marked 2/3 to pin 2	2/3	For high voltage gensets.
low voltage genset		12-lead CT secondary wire marked 2/3 to pin 3	2/3	For low voltage gensets.

Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.

Parts cataloged across the Cummins/Onan KTA50 family

300

Part #	Description	Category
140-2096	Element, Primary (Outer)	Air filter
140-2098	Air Cleaner - Throwaway Type	Air filter
140-2467	Element, Safety (Inner)	Air filter
140-2501	Cleaner, Air (Disposable)	Air filter
140-2502	Band, Mounting – Air Cleaner	Air filter
140-2503	Bracket, Mounting	Air filter
140-3163	Cleaner, Air (No Replaceable Element)	Air filter
140-3230	Cleaner, Air (Includes Elements - See Ref. No. 25 and 26)	Air filter
309-0272	Regulator, Voltage - 24 VDC (Used on 35 A MP Alternator)	Alternator
309-0561	Alternator & Drive Components Group Pulley. Alternator - Multi Groove (Use with 35 A MP Alternator)	Alternator
503-1743-01	Alternator & Orive Components Group Pulley, Alternator - Multi Groove (Use with 35 AMP Alternator)	Alternator
206587	CAP, MAIN BEARING	Bearing cap
206588	CAP, MAIN BEARING	Bearing cap
98-5347	Decal - Caution Fan Drive & Lube Components Group Belt.	Belt
106069	SCREW, HEXAGON HEAD CAP	Bolt
205584	SCREW, TWELVE POINT CAP	Bolt
206028	SCREW, SOCKET HEAD CAP	Bolt
3032633	SCREW, TWELVE POINT CAP	Bolt
3177945	SCREW, HEX FLANGE HEAD CAP	Bolt
3628452	SCREW, HEXAGON HEAD CAP	Bolt
S-112	SCREW, HEXAGON HEAD CAP	Bolt
205684	BRACKET, LIFTING	Bracket lifting
205230	BUSSING	Bushing
0300-4623-29	DFLB (600V)	Current transformer
0300-4623-30	DFLC (600V)	Current transformer
0300-4623-52	DFLB BR (0-480V)	Current transformer
0300-4623-54	DFLC BR (0-480V)	Current transformer
3178803	CYLINDER BLOCK OPTION BP6089	Cylinder block
3178910	CYLINDER BLOCK	Cylinder block
148582	DOE, PIN	Dowel pin
70662	DOE, PIN	Dowel pin
3629497	DRAINCOCK	Draincock
206224	PLUG, EXPANSION	Expansion plug
206742	PLUG, EXPANSION	Expansion plug
3629168	PLUG, EXPANSION	Expansion plug
122-0757	Filter. Water - W/Corosion Inhibiting Chemical	Filter
159-1445	Reservoir, Fuel	Fluid
FS1216	Fuel/Water Sep Spin-On	Fuel filter
121-0113	Gasket, Pump	Gasket
121-0117	Gasket, Hand Hole	Gasket
205059	WASHER, PLAIN	Gasket
3002993	DOE, RING	Gasket
3025485	WASHER, PLAIN	Gasket
3176857	DOE, RING	Gasket
3178450	WASHER, PLAIN	Gasket
3178457	WASHER, PLAIN	Gasket
M-4352581	Upper Gasket Set	Gasket
S-604	WASHER, LOCK	Gasket
S-610	WASHER, LOCK	Gasket
338-2529	Harness. Wiring	Harness
128-0108	Insulation, Hose – Bulk (Order By The Foot – 12 Feet Required)	Hose
130-3538	Chemical DCA4 Service Pre-Charging Complete System	Hose
130-3576	Clamp, Hose	Hose
130-5588-02	Tube, Water Heater	Hose
130-5589-02	Tube, Water Heater	Hose
130-5590-02	Tube, Water Heater	Hose
130-5591-02	Tube, Water Heater	Hose
338-2925	Hose, Radiator	Hose
501-0704	Line, Flexible Fuel - Fuel Out	Hose
501-0707	Line, Flexible Fuel - Fuel In	Hose
502-1162	Connector, Hose (3/8")	Hose
503-0183	Clamp, Hose	Hose
503-0685	Clamp, Hose	Hose
503-0868	Clamp, Hose - T-Bolt Type (3.5" NON)	Hose
503-1140	Hose, Rubber	Hose
503-1484	Elbow, Hose (45 Deg) (7" ID)	Hose
503-1620	Hose – Bulk (3/8" ID) (Order by the Foot)	Hose
503-1727	Hose, Radiator (3” ID x 10”)	Hose
503-1728	Hose (3” ID x 5–1/2”)	Hose
503-1870-11	Clamp, Hose	Hose
503-1870-12	Clamp, Hose	Hose
505-0324	Hose. Bulk (Sold by the Foot) Two Feet Required Nipple, Pipe - Half (3/4 NPT x 2"LG)	Hose
518-0548-24	Clamp, Hose	Hose
98-5759	Drive - Multi Groove Hose, Flexible - Lube (Grease)	Hose
98-5842	Clamp, Hose - T-Bolt Type (3.5" NON)	Hose
3375004	Dial Indicator Kit for injector and valve adjustment	Injector
3822575	Injector and valve adjustment kit	Injector
FP-3053124	Injector Assembly, PTK (New)	Injector
3011884	INSERT, LINER	Insert liner
3019150	INSERT, LINER	Insert liner
3021148	INSERT, LINER	Insert liner
206580	BEARING, MAIN	Main bearing
206581	BEARING, MAIN A/R No.2,3,4,5,6,7,&8, Upper	Main bearing
206582	BEARING, MAIN A/R No.2,3,4,5,6,7,&8, Upper	Main bearing
206583	BEARING, MAIN A/R No.2,3,4,5,6,7,&8, Upper	Main bearing
206584	BEARING, MAIN A/R No.2,3,4,5,6,7,&8, Upper	Main bearing
206590	BEARING, MAIN	Main bearing
206591	BEARING, MAIN A/R No.2,3,4,5,6,7,&8, Lower	Main bearing
206592	BEARING, MAIN A/R No.2,3,4,5,6,7,&8, Lower	Main bearing
206593	BEARING, MAIN A/R No.2,3,4,5,6,7,&8, Lower	Main bearing
206594	BEARING, MAIN A/R No.2,3,4,5,6,7,&8, Lower	Main bearing
206600	BEARING, MAIN	Main bearing
206601	BEARING, MAIN A/R No.1&9, Upper	Main bearing
206602	BEARING, MAIN A/R No.1&9, Upper	Main bearing
206603	BEARING, MAIN A/R No.1&9, Upper	Main bearing
206604	BEARING, MAIN A/R No.1&9, Upper	Main bearing
206610	BEARING, MAIN	Main bearing
206611	BEARING, MAIN A/R No.1&9, Lower	Main bearing
206612	BEARING, MAIN A/R No.1&9, Lower	Main bearing
206613	BEARING, MAIN A/R No.1&9, Lower	Main bearing
206614	BEARING, MAIN A/R No.1&9, Lower	Main bearing
3018210	SET, MAIN BEARING STANDARD	Main bearing set
3018211	SET, MAIN BEARING A/R .010 Inch O/S	Main bearing set
3018212	SET, MAIN BEARING A/R .020 Inch O/S	Main bearing set
3018213	SET, MAIN BEARING A/R .030 Inch O/S	Main bearing set
LF3325	Full-flow spin-on lubricating oil filter element	Oil filter
016-40820	Harness, Wiring (Includes Cable Ties and Terminals)	Service part / kit
102-1335	Plug, Oil Drain	Service part / kit
121-0116	Cover, Hydraulic Hole	Service part / kit
130-2981	Cap. Radiator - 7#PSI	Service part / kit
130-3758	Radiator (includes Cap)	Service part / kit
140-1260	Fitting, Safety Filter	Service part / kit
140-1548	Indicator, Service	Service part / kit
140-2097	Cleaner, Air (Includes Elements)	Service part / kit
140-2099	Band	Service part / kit
140-2395	Tube, Air Inlet	Service part / kit
140-2504-01	Bracket - Right Side	Service part / kit
140-2504-02	Bracket - Left Side	Service part / kit
140-2508	Tube, Air Inlet (7" x 9" - 3/4")	Service part / kit
140-2509	Tube, Air Inlet	Service part / kit
140-2515	Bracket, Mounting	Service part / kit
140-2519	Tube, Air Inlet	Service part / kit
140-2521	Tube, Air Inlet	Service part / kit
140-2528	Shield – Air In Heat	Service part / kit
300-2856	Board Assy, Printed Circuit	Service part / kit
300-2863	Board Assy, Printed Circuit - Relay Assembly- (A14)	Service part / kit
3007525	(3022157) KIT, LINER LINER, CYLINDER	Service part / kit
301-9054-01	Decal - Panel Front Markings (Control With Meters)	Service part / kit
301-9054-02	Clip - Fastener	Service part / kit
301-9054-03	Clip - Fastener	Service part / kit
3012611	CYLINDER LINER (O/S) KIT, LINER A/R .020 inch O/S	Service part / kit
3012612	CYLINDER LINER (O/S) KIT, LINER A/R .030 Inch O/S	Service part / kit
302-1720	Meter, Frequency (M23)	Service part / kit
302-1753	Ammeter (M22) See Current Transformer & Ammeter Installation Figure for Parts)	Service part / kit
302-1800	Ammeter (M22) Scale in Amps as Indicated 0-2000/0-4000 (600 VAC Application) 0-3000/0-6000 (120-480 VAC Application)	Service part / kit
302-1908	Screw. Cap - Hex Head (M8-1.25 x 35MM)	Service part / kit
305-0813-01	Battery charger, Onan, 120V, 375W	Service part / kit
305-0818-02	EOOO-21002	Service part / kit
307-1056	Relay. 24 VDC	Service part / kit
307-1987	2 307-1056 3 3 815-0388 6 4 323-0804 3 5 815-0544 3 6 319-0447 1 7 NOTE 1 REF 8 NOTE 2	Service part / kit
308-0882	Decal - Panel Front Markings (Control Without Meters)	Service part / kit
309-0436	Decal - Model Identification ONAN GEN SET CUMMINS GEN SET CUMMINS ONAN GEN SET	Service part / kit
309-0437	(222"F)	Service part / kit
309-0635-02	Valve, Check	Service part / kit
3096680	Piston STC 13.8:1 Ratio	Service part / kit
3096681	Piston KT Series 15.5:1 Ratio	Service part / kit
3096682	Piston KTA Series 14.5:1 Ratio	Service part / kit
3096683	Piston 13.5:1 Ratio	Service part / kit
3096684	Piston KTA 15.7:1 Ratio	Service part / kit
3096685	Piston STC 13.9:1 Ratio	Service part / kit
319-0447	Screw. Machine - Pan Head. Cross-Recessed Drive (#6-32 x 1/2")	Service part / kit
319-0754	Tie. Cable	Service part / kit
322-0363	Component 322-0363	Service part / kit
323-0804	Screw. Machine - Round Head with IT Lock Washer (#6-32 x 1/2")	Service part / kit
323-1200	# Socket, Contact (Used in J1, J2)	Service part / kit
323-1304	tiotming, Umector	Service part / kit
323-1306	Genset component (SJB series)	Service part / kit
3318201	Battery Cable Group	Service part / kit
332-0052	Clamp, Loop	Service part / kit
332-0607	Block, Terminal (T81)	Service part / kit
332-1279	Terminal. Lug - Ring (3/8	Service part / kit
332-1292	Sender, Pressure - Oil (E123)	Service part / kit
332-1445	Tie, Cable 18 98-5219 1 Decal - Panel Front (Not I l l u s t r a t e d ) 19 98-5220 1 Decal	Service part / kit
332-1673	Terminal, Wire - Spade	Service part / kit
332-2634	Clamp, Hose	Service part / kit
332-2723	Strip. Marker	Service part / kit
333-0677-01	Heater, Coolant - 4990 Watt	Service part / kit
333-0677-02	Heater, Coolant - 6420 Watt	Service part / kit
3375005	Dial indicator extension	Service part / kit
3375007	Support Plate / Support Block for dial indicator	Service part / kit
338-1835	Harness, Wiring (A13 to A l l )	Service part / kit
338-1836	Harness, Wiring (A14 to All) (Relays)	Service part / kit
338-1904	Harness. Wiring (A15 to All)	Service part / kit
338-2278	Harness. Wiring - AC (Includes Terminal Block & Cable Ties) [Used only with meters]	Service part / kit
338-2532	Terminal. Lug - Forked (No. 6 Screw)	Service part / kit
355-0093	Voltmeter (M21) Dual Scale 0-300/0-600V Single Scale 0-750V	Service part / kit
3628731	Piston STC Kit	Service part / kit
3630913	Piston KTA-50-G7	Service part / kit
3631241	Piston Kit STC 13.9:1 Ratio	Service part / kit
3631242	Piston Kit 13.5:1 Ratio	Service part / kit
3631243	Piston Kit KTA 15.7:1 Ratio	Service part / kit
3631244	Piston Kit KTA Series 14.5:1 Ratio	Service part / kit
3631245	Piston Kit KT Series 15.5:1 Ratio	Service part / kit
3631246	Piston Kit STC 13.8:1 Ratio	Service part / kit
3801268	CYLINDER LINER (O/S) KIT, LINER A/R .040 Inch O/S	Service part / kit
3803530	Piston Assembly STC	Service part / kit
3804747	Piston Kit KTA-50-G7	Service part / kit
3804885	Piston KTA-50-G8/G9	Service part / kit
406-0333	Component 406-0333	Service part / kit
406-0334	Clip, Retaining - Turnbutton Fastener	Service part / kit
4089847	Piston Kit GTA38/19	Service part / kit
4090013	Piston Kit KTA-38-M2	Service part / kit
4090029	Piston Kit QSK19CE	Service part / kit
4090181	Piston GTA38/19	Service part / kit
4097889	Piston KTA-38-M2	Service part / kit
4910463	Piston QSK19R/M	Service part / kit
4910465	Piston QSK Series	Service part / kit
4916177	Piston GTA/GQSK19	Service part / kit
4918058	Piston QSK19CE	Service part / kit
4922319	Piston QSK19C	Service part / kit
4955233	Piston Kit QSK19R/M	Service part / kit
4955235	Piston Kit QSK Series	Service part / kit
4955236	Piston Kit QSK19C	Service part / kit
4955238	Piston Kit GTA/GQSK19	Service part / kit
501-0520	Screw, Cap - Hex Head (3/8-24 x 5/8")	Service part / kit
501-0524	Washer, Lock - EIT (3/8")	Service part / kit
501-0558	Line. Flexible - Bypass	Service part / kit
503-1717	Elbow, Reducer (45 Deg) (7" ID to 6" ID)	Service part / kit
503-1720	Insert, Reducer (6" OD to 5-1/2" ID)	Service part / kit
503-1730	503-0183 21 503-1731 22 505-0324 23 504-0171 24 505-0102 25 505-0132 26 505-0102 27 28 29	Service part / kit
504-0028	Valve, Radiator Drain	Service part / kit
505-0007	Belt. Drive - Multi Groove (Used with 35 A MP Alternator * Pulley, Alternator - Multi Groove (Use with 75 A MP Alternator)	Service part / kit
505-0017	Bushing, Pipe – Reducer (3/8" to 1/4")	Service part / kit
505-0021	Bushing, Pipe - Reducer (3/4º to 1/2º)	Service part / kit
505-0100	Nipple, Pipe - Close (1/2”)	Service part / kit
505-0102	Filter. Water - W/Corosion Inhibiting	Service part / kit
505-0117	Bushing, Reducer - Flush, Brass (1/2' NPT x3/8° NPT)	Service part / kit
505-0132	Nipple, Pipe - Close (3/4 NPT x l-3/8"LG) Elbow. Pipe - 90* (3/4 NPT)	Service part / kit
505-0376	Elbow – 45 Deg (3/8")	Service part / kit
508-0015	Washer, Insulating - Fiber (#8)	Service part / kit
511-0161-02	.*	Service part / kit
517-0131	Capacitor (Used across Voltmeter Terminals on some Sets)	Service part / kit
518-0548-42	Clamp, Retainer 4 Prior To December 1996 Production (Mounted On Top And Side Of Control Box Wrapper)	Service part / kit
526-0030	Washer, Flat (3/8")	Service part / kit
800-0055	Screw, Cap – Hex Head (3/8–16 x 2-1/4")	Service part / kit
800-0062	Nut, Insulated	Service part / kit
800-0094	Screw, Cap – Hex Head (1/2–13 x 2")	Service part / kit
800-0270	DCA4 Service Pre-Charging Complete System	Service part / kit
800-2060	Screw, Cap - Hex Head (M8x 1.25 x35)	Service part / kit
809-0035	Screw, Machine - Thread Cutting, Round Head (#8 X 3/4')	Service part / kit
812-0063	853-0003 300-2856 338-1836 812-0063 853-0003 300-2863 338-1835 332-1445 NOTE 1 NOTE 2 332	Service part / kit
812-0065	Screw, Machine - Round Head (#6 - 32 x 5/8')	Service part / kit
812-0084	Screw. Machine - Round Head (	Service part / kit
815-0388	Bracket. Mounting - Relay Lead(s), Electrical Wire, Electrical - 20 AW G, Insulated Terminal, Wire - Forked, 18-20 Gauge	Service part / kit
815-0544	Screw, Machine - Round Head IT Washer (#6 - 32 x 1/2')	Service part / kit
821-0004	Screw, Self-Locking - Hex	Service part / kit
821-0029	Screw, Self–Locking – Hex Washer Head (3/8–16 x 3/4")	Service part / kit
821-0033	Screw, Self–Locking – Hex Washer Head (7/16–14 x 3/4")	Service part / kit
821-5004-03	Screw, Self-Locking – Hex Washer Head (3/8–16 x 1")	Service part / kit
850-0050	Washer, Lock - Spring (3/8”)	Service part / kit
853-0003	Washer, Lock - ET (#6)	Service part / kit
856-0008	Washer, Lock - EIT (5/16'1)	Service part / kit
856-0010	Washer, Lock - EIT (3/8')	Service part / kit
870-0131	Nut. Hex - with ET (#10-32)	Service part / kit
870-0196	Nut, Insulating (#8)	Service part / kit
870-0281	Nut, Self-Locking – Hex Washer Head (3/8–16)	Service part / kit
900-0181	PCC Control Service Manual	Service part / kit
903-0128	NA	Service part / kit
903-0208	NA	Service part / kit
903-0608	NA	Service part / kit
98-4732	Caution	Service part / kit
98-4798	Decal - Caution "7# PSI HOT WATER SYSTEM"	Service part / kit
98-5298	Decal - Panel Rear Markings (All Control Panels)	Service part / kit
98-5299	Decal - Panel Rear Markings (All Control Panels)	Service part / kit
98-5316	Decal - Panel Rear Markings (All Control Panels)	Service part / kit
98-5387	Nut, Self-Locking - with ET Lockwasher (#10-32)	Service part / kit
98-5393	Screw, Tapping - Round Head (#8 x 3/4")	Service part / kit
98-5822	Bushing, Reducer - Flush (1/2 NPT x 3/8 NPT)	Service part / kit
98-6108-03	Decal - Model Identification	Service part / kit
98-6111-03	ONAN GEN SET CUMMINS GEN SET	Service part / kit
98-6139-03	CUMMINS ONAN GEN SET	Service part / kit
98-6169	Terminal Assembly (Includes Replaceable Items 26 thru 29)	Service part / kit
F-2375	A single line drawing of the prime power system	Service part / kit
M-3804747	Piston Kit	Service part / kit
68445	PIN, GROOVE	Pin
3628605	PLUG, PIPE	Pipe plug
3628607	PLUG, PIPE	Pipe plug
3178464	PLATE, COVER	Plate cover
121-0111	Drive, Pump	Pump
159-1451	Pump, Fuel Transfer	Pump
3011076	SEAL, D RING	Seal
3014668	SEAL, D RING	Seal
3081489	SEAL, OIL	Seal
3177556	SEAL, RECTANGULAR RING	Seal
508-0292	Washer, Sealing - Copper	Seal
509-0283-01	Seal	Seal
509-0336	Seal, O-Ring	Seal
509-0337	Seal, O-Ring	Seal
193-0244	Sender, Oil Pressure (E1)	Sensor
193-0375	Sender, Coolant	Sensor
309-0269	Sender, Temperature-Lo Engine	Sensor
960-0181	Service manual	Service manual
960-0302	Service manual	Service manual
960-0504	PCC Control Service Manual	Service manual
960-0507	Detector Control Service Manual	Service manual
3033853	SHAFT, IDLER	Shaft idler
3175281	SHAFT, IDLER	Shaft idler
205741	SHIM, A/R .007 Inch O/S	Shim
205742	SHIM, A/R .008 Inch O/S	Shim
205743	SHIM, A/R .009 Inch O/S	Shim
205744	SHIM, A/R .020 Inch O/S	Shim
205745	SHIM, A/R .031 Inch O/S	Shim
149-2232	Starter - 24 VDC	Starter
3000138	SUPPORT, BEARING	Support bearing
309-0649	Thermostat (Includes Connector Socket) (S11)	Thermostat
3000139	BEARING, THRUST	Thrust bearing
3001708	BEARING, THRUST A/R .010 Inch O/S	Thrust bearing
3001709	BEARING, THRUST A/R .020 Inch O/S	Thrust bearing
3001710	BEARING, THRUST A/R .030 Inch O/S	Thrust bearing
3001711	BEARING, THRUST A/R .040 Inch O/S	Thrust bearing

Parts cataloged across all variants of this engine family — verify the exact part fits your specific variant and serial number before ordering.

Common questions

What is the oil capacity of the Cummins/Onan KTA50-G3?

The Cummins/Onan KTA50-G3 engine has an oil capacity of 204 L (215.6 US qt).

What is the displacement of the Cummins/Onan KTA50-G3?

The Cummins/Onan KTA50-G3 has a displacement of 50.0 liters with 16 cylinders.

Which generators use the Cummins/Onan KTA50-G3 engine?

The Cummins/Onan KTA50-G3 powers 14 generator set(s), including Cummins/Onan 1005 DFLC, Cummins/Onan 1120 DFLC, Cummins/Onan C1250 D2R, Cummins/Onan C1400 D5, Cummins/Onan DFLC.

What is a common problem with the Cummins/Onan KTA50-G3 engine?

A commonly reported issue on generators using the Cummins/Onan KTA50-G3 is: Over Current.