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Cummins/Onan KTA50-G9 Engine

The Cummins/Onan KTA50-G9 is a 50 L 16-cylinder turbocharged and low temperature aftercooled engine rated at 1800 rpm, producing up to 1656 kW. It powers generator sets from Cummins/Onan and Everdigm, including the 1500DFLE, 1500DFLE-1540, C1500D6R and DFLE. It holds 120 L (31.7 gal) of oil and 379 L (100.1 gal) of coolant.

Also known as: Cummins KTA50-G9

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

50.0 L

Displacement

Cylinders

1800 rpm

Rated speed

1656 kW

Gross power

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

Engine specifications

Oil capacity	120.0 L
Coolant capacity	379.0 L
Displacement	50.0 L
Cylinders	16
Aspiration	Turbocharged and low temperature aftercooled
Rated speed	1800 rpm
Gross power	1656 kW

Generator sets powered by this engine

Shared across brands: Cummins/Onan, Everdigm

Cummins/Onan 1500DFLECummins/Onan 1500DFLE-1540Cummins/Onan C1500D6R Cummins/Onan DFLECummins/Onan DFLE-3313575Cummins/Onan DFLE-33772633Cummins/Onan DFLE-5005286Cummins/Onan KTA50 Everdigm EDG-1500C

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

Common problems

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.
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.
SHORT CIRCUIT — Shutdown 322
Cause: Indicates that generator output current has exceeded 175% of rated.
Fix: Contact an authorized service center.
REVERSE POWER — Shutdown 335
Cause: Indicates improper CT or PT phasing. (Non-parallel units only.)
Fix: Contact an authorized service center.
LOW OIL PRESSURE — Shutdown 201
Cause: Indicates engine oil pressure has dropped below the shutdown trip point.
Fix: Check oil level. If oil level is low, replenish. Reset control and restart. Oil pressure limits are listed in Specifications. Contact an authorized service center.
LOW AC VOLTAGE — Shutdown 303
Cause: Indicates that one or more of the phase voltages has dropped below 85% of nominal for 10 seconds.
Fix: Contact an authorized service center.
HIGH COOLANT TEMP — Shutdown 212
Cause: Indicates engine has overheated (coolant temperature has risen above the shutdown trip point).
Fix: Allow engine to cool down completely before proceeding with the following checks: Check coolant level and replenish if low. Look for coolant leakage and repair if necessary; Check for obstructions to cooling airflow and correct as necessary; Check fan belt and repair or tighten if necessary; Reset control and restart after locating and correcting problem. Contact an authorized service center if none of the above.
HIGH AC VOLTAGE — Shutdown 301
Cause: Indicates that one or more of the phase voltages has exceeded 130% of nominal, or has exceeded 110% of nominal for 10 seconds.
Fix: Contact an authorized service center.
EEPROM ERROR — Warning 251
Cause: Indicates PCC memory error. Data corruption of noncritical operating parameters.
Fix: Contact an authorized service center.
Over Current 1471
Low Coolant Level 197
WEAK BATTERY — Lamp: Warning 1442
Cause: During cranking, the battery voltage is at or below the weak battery warning trip point for a time greater than or equal to the weak battery set time
Fix: See code 441 for corrective action.
Warning, Shutdown, and Non-Automatic lamps are not lit. Digital display shows main menu or selected menu.
Cause: Indicates all engine systems are normal.
Fix: No corrective action required.
TOO LONG IN IDLE — Lamp: Warning 2342
Cause: Genset has been in Idle mode too long (10 minutes maximum)

Compiled from service & troubleshooting documentation across every generator set that uses the Cummins/Onan KTA50-G9.

Maintenance schedule

Item	Spec	Part #	Interval
Air filter	Cummins Heavy-Duty Engine - Rugged 4-cycle industrial diesel delivers reliable power, low emissions, and fast response to load changes.	—
Fuel filter		—
Oil filter	Last changed 4/14/2025 @ 180 HRS	—	180 hr
Battery		—
Belt		—
Coolant	104oF (40oC) ambient radiator	—
Oil	Cummins Heavy-Duty Engine - Rugged 4-cycle industrial diesel delivers reliable power, low emissions, and fast response to load changes.	—
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
Check Electrolyte Level (batteries)	Check	200 hr		At least every 200 hours of operation
Air cleaner element - restriction	Check	250 hr	6 mo	Replace air cleaner element as required
All belts	Check	250 hr	6 mo
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)
Cooling fan	Check	250 hr	6 mo	Check for cracks, loose rivets, bent or loose blades
Crankcase oil and filter	Change	250 hr	12 mo	Standby applications: change oil every 12 months or 250 hours, whichever comes first
Engine oil	Change	250 hr	6 mo	Whichever occurs first
Fan idler pivot arm	Lubricate	250 hr	6 mo	Water pump type grease until grease appears
Front engine support	Lubricate	250 hr	6 mo	Chevron SRI grease or equivalent
Fuel filter	Replace	250 hr	6 mo
Hoses	Inspect	250 hr	6 mo	Check/replace as required
Oil filters	Change	250 hr	6 mo	Change filters with oil
Pulley tensioner	Check	250 hr	6 mo
Engine oil filters	Change	805 hr		Last changed date and HRS: 2/3/2025, 805HRS
Batteries	Check	1500 hr	12 mo
Cold start aids	Check	1500 hr	12 mo	Seasonal
Crankshaft end clearance	Inspect	1500 hr	12 mo
Engine (steam clean)	Clean	1500 hr	12 mo	Before conducting any 1500 hour maintenance
Engine mounting bolts and nuts	Check	1500 hr	12 mo	Tighten loose; inspect rubber
Engine protection system	Check	1500 hr	12 mo
Fan idler pulley tensioner	Adjust	1500 hr	12 mo
Heat exchanger zinc plugs (marine only)	Check	1500 hr	12 mo	Change if 50 percent eroded
Valves and injectors	Adjust	1500 hr	12 mo	First service — Initial adjustment at 1500 hours; thereafter not again before 6000 hour injector calibration
valve clearance	Check	2000 hr		B-Series (4BT3.3): valve clearance checks not required for 2000 hours, twice the industry standard
Grease generator bearing (P7)	Lubricate	4000 hr		Table 5-2 explicit interval; grease type Kluber ASONIC GHY72, 75 grams
Generator bearing (P7 only)	Lubricate	4500 hr		Re-lubrication period 4000-4500 hours; 75 grams Kluber ASONIC GHY72
Air compressor	Inspect	6000 hr	24 mo	Discharge and intake checks
Coolant	Change	6000 hr	24 mo	Clean and flush cooling system
Crankcase breather element	Replace	6000 hr	24 mo	Clean/replace
Engine protection system	Adjust	6000 hr	24 mo	Calibrate
Fan hub	Inspect	6000 hr	24 mo	End clearance and grease leakage
Fan idler pulley assembly	Replace	6000 hr	24 mo	Rebuild or replace as necessary
Fuel pump	Clean	6000 hr	24 mo	Clean and calibrate
Injectors	Clean	6000 hr	24 mo	Clean and calibrate
Thermostats and seals	Replace	6000 hr	24 mo
Turbocharger	Inspect	6000 hr	24 mo
Vibration damper	Inspect	6000 hr	24 mo	Replace after 24,000 hours; K2000 dampers replaced every 12,000 hours
Water pump	Replace	6000 hr	24 mo	Rebuild or replace
engine overhaul	Other	20000 hr		QSK23-Series: expected life cycle to 20,000 hours before first overhaul
Exercise generator set	Test		1 mo	At least once a month for a minimum of 30 minutes, under not less than 30 percent of nameplate rating

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	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	Fan hub bearing end clearance	0.03 MIN / 0.15 MAX	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	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 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
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	Air compressor discharge carbon deposit thickness limit	2	mm	1/16 in
Other	Alternator belt tension	356	N	80 lbf, Burroughs tension gauge GT-1293
Other	Amperage PH1	1806		5 Min.
Other	Amperage PH2	1802		5 Min.
Other	Amperage PH3	1804		5 Min.
Other	B+ output fuse	10	amp	F1, Base board, 12/24 volt
Other	Battery charging current	45	Amps
Other	Battery specific gravity - charge threshold (below this, charge battery)	1.215
Other	Battery specific gravity - fully charged (corrected)	1.260
Other	Continuous crank without cycle cranking option (PCC)	up to 75	seconds
Other	Customer Output relay contact rating	2	amps at 30 VDC	TB1 customer outputs 1-4, normally open
Other	Eng Hours	228.2		5 Min.
Other	Eng Hours	228.4		15 Min.
Other	Eng Hours	228.6		30 Min.
Other	Eng Hours	228.9		45 Min.
Other	Eng Hours	229.1		1 Hour
Other	Eng Hours	229.3		1-1/2 Hr.
Other	GOV GAIN default value for paralleling applications	70	%
Other	Ground Fault Relay current setting	5 to 1200	amperes	optional GFR
Other	Ground Fault Relay time delay setting	0 to 1	second	optional GFR
Other	Kilowatts	1500		5 Min.
Other	Maximum vibration damper thickness - Houdaille	66.38	mm	2.574 in
Other	Maximum vibration damper thickness - Made in England Before F-82	65.91	mm	2.595 in
Other	Maximum vibration damper thickness - Made in England F-82 and After	65.66	mm	2.585 in
Other	Optional control relay (K11/K12/K13) contact rating	10	amps at 600 VAC
Other	Output frequency adjustment range	+/- 5	%	set running, not in idle mode
Other	Overcrank cycle cranking (Detector, standard)	three 15-second cranking cycles with two 15-second rest periods	seconds
Other	Overcrank cycle cranking (PCC)	3, 4, or 5 cycles; crank and rest times 7 to 20	seconds
Other	Overcrank limit (Detector, optional)	75	seconds
Other	Overcurrent shutdown threshold	110% of rated	% of rated	PCC time/current calculation
Other	Overcurrent warning threshold	110% of rated for 60 seconds	% of rated	generator output current
Other	Overload warning threshold	105% of standby or 115% of prime	% of rating	three-phase power output; load dump after five seconds, warning after 60 seconds
Other	PTD injector travel verification specification	7.80 MIN / 7.82 MAX	mm
Other	PTD non-top stop injector travel adjustment	7.82	mm
Other	PTD non-top stop injector travel limits	7.77 to 7.87	mm
Other	REG VHZ (underfrequency roll-off) adjustable range	1 through 50; normal range 7 through 21
Other	Short circuit shutdown threshold	175% of rated	% of rated	generator output current
Other	Start delay (PCC, remote start in Auto)	0 to 300	seconds
Other	Start delay adjustment range	0 to 300	seconds
Other	Stop delay (PCC, remote stop in Auto)	0 to 600	seconds

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	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	soft water / E.G. / DCA mixture				Cooling system to be filled with soft water/E.G./DCA mixture (on-site review checklist).
Engine oil	SAE 15W-40	API CE or CF4 (CD or CD/SF where CE/CF4 not available)			Multigrade preferred; sulfated ash limit must not exceed 1.85 mass percent. Arctic operation (below -23 C) use synthetic CE/SF 5W-30.
Fuel	ASTM No. 2 diesel	ASTM			Alternate diesel fuels per Cummins engine O&M Manual specifications
Fuel	Diesel				Day tank fuel transfer pump maintains reservoir of diesel fuel in the day tank.
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
Grease	Lithium based		-30°C to 120°C	81.0 ml	Mobilux No. 2 or Shell Alvania R3; generator end bearing; temperature range -22 F to +248 F (-30 C to +120 C); grease divided between bearing, bearing cap cavity and cartridge cavity.
Grease	Lithium based grease, Mobilux No. 2 or Shell Alvania R3		-30°C to 120°C	2.74 oz (81 ml)	End bearing lubricant; grease equally divided between bearing, bearing cap cavity and bearing cartridge cavity.
Other	Donaldsons D1400 solvent (or equivalent)				Air cleaner element cleaning: soak filter at least 15 minutes in water and Donaldsons D1400 solvent.

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 112 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

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.

HC4-7 Axial Alignment Procedure adjustment

Tools: Dial indicator with magnetic base or clamp

Check only when an objectionable vibration is present.
Fasten dial indicator holding device to skid base, engine block, or generator shell with magnetic base or clamp.
Position sensor point on the generator shaft hub.
Bar the engine over in a clockwise rotation as viewed from engine flywheel through a couple of rotations.
Record indicator readings in eight equally spaced points around the shaft diameter.
Remove the capscrews connecting drive discs and flywheel and mark discs and flywheel.
Rotate engine or generator so drive disc holes are repositioned 180 degrees from original location.
Put capscrews back in and retorque. Recheck shaft alignment.
If runout unchanged, rotate discs to 30, 60 or 90 degrees from original location.
If T.I.R. does not improve, inspect flywheel pilot and drive disc runouts.

P7 Axial Alignment Procedure adjustment

Check only when an objectionable vibration is present.
Remove the capscrews connecting drive discs and flywheel.
Mark the drive discs and flywheel with respect to each other.
Rotate engine or generator so drive discs holes are repositioned two bolt holes from original location.
Put capscrews back in and retorque. Recheck/record vibration levels.
Repeat this test until drive disc holes are repositioned 180 degrees from original location.
Review vibration data and position drive disc in lowest recorded level location.

PT (type D) Injector - Adjustment adjustment

⚠ The injector plunger is under spring tension. Do NOT allow the tool to slip.

⚠ Prevent damage to the indicator by allowing the lever to return slowly.

Tools: 3822575 injector and valve adjustment kit, 3822574 rocker lever actuator, ST-669 Torque Wrench Adapter

Assemble the parts of an injector and valve adjustment kit, Part No. 3822575, or equivalent, and install it on the cylinder.
Adjust the indicator so the tip touches the top of the injector plunger.
Lower the indicator 12.25 mm [0.5 inch] to allow for travel. Lock the indicator support to the post.
Use a rocker lever actuator, Part No. 3822574, or equivalent. Depress the lever until the injector bottoms two or three times.
Hold the lever with the injector plunger firmly bottomed and set the indicator to ZERO.
Turn the adjusting screw until the indicator reads the specified travel.
Tighten the locknut to the torque value.
Check the injector adjustment and repeat if not within specification.

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 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
277/480	3		12	Generator end is 12 lead reconnectable and has PMG permanent magnet generator
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-G9?

The Cummins/Onan KTA50-G9 engine has an oil capacity of 120.0 liters.

What is the displacement of the Cummins/Onan KTA50-G9?

The Cummins/Onan KTA50-G9 has a displacement of 50.0 liters with 16 cylinders.

Which generators use the Cummins/Onan KTA50-G9 engine?

The Cummins/Onan KTA50-G9 powers 9 generator set(s), including Cummins/Onan 1500DFLE, Cummins/Onan 1500DFLE-1540, Cummins/Onan C1500D6R, Cummins/Onan DFLE, Cummins/Onan DFLE-3313575.

What is a common problem with the Cummins/Onan KTA50-G9 engine?

A commonly reported issue on generators using the Cummins/Onan KTA50-G9 is: 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..