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Cummins/Onan 6CTA8.3 Engine

The Cummins/Onan 6CTA8.3 is a 8.3 L 6-cylinder turbocharged engine. It powers generator sets from Cummins/Onan, including the 6CTA8.3 series engine, DGFA and DGFB. It holds 19 L (5.0 gal) of oil and 28 L (7.4 gal) of coolant.

Also known as: Cummins 6CTA8.3

Part of the Cummins/Onan 6CTA8.3 engine family — 9 variants share parts & fitment.

8.3 L

Displacement

Cylinders

19.0 L

Oil capacity

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

Engine specifications

Oil capacity	19.0 L
Coolant capacity	28.0 L
Displacement	8.3 L
Cylinders	6
Aspiration	Turbocharged

Generator sets powered by this engine

Cummins/Onan 6CTA8.3 series engine Cummins/Onan DGFA Cummins/Onan DGFB

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

Troubleshooting

Fault codes

Code	Meaning
31	Engine will not shut off
38	Excessive engine moisture
86	Excessive fuel consumption
387	Excessive vibration
80	Exhaust smoke excessive under load
338	Knock
29	Fuel or oil leaking from exhaust manifold
35	Low power

Fault codes and symptom→remedy steps extracted from this engine’s service/owner documentation; verify against the official manual before servicing.

Common problems

Over Current 1471
Low Coolant Level 197
Weak Battery 1442
Under Frequency 1448
Too Long in Idle 2342
The FAULT 1 or FAULT 2 fault lamp lights. Engine shuts down immediately, engine runs for several seconds and then shuts down, or engine continues to run.
Fix: The standard undesignated fault functions are programmed to shut down the set when a fault is sensed. Fault 1 is time delayed while Fault 2 is immediate. The nature of the fault is an optional selection that is determined when the set installation is designed. The undesignated fault functions may also be programmed for non-shutdown or non-time delay.
The engine does not start
Cause: The starter will disengage after a specified period of time and the control will indicate an overcrank shutdown.
Fix: Place the O/Manual/Auto switch in the O position and press the Fault Acknowledge/Reset button. Before attempting to restart, wait two minutes for the starter motor to cool and then repeat the starting procedure. If the engine does not run after a second attempt, refer to the Troubleshooting section.
SWITCH OFF lamp flashes.
Fix: Indicates Run/Stop/Remote switch is in the Stop position which will prevent automatic starting if an automatic transfer switch is used. Move the Run/Stop/Remote switch to the Remote position for automatic starting.
Status Indicators are not functioning properly.
Fix: Check the status indicators for any visible damage or loose connections. If the issue persists, refer to the Fault Code Table for further troubleshooting.
Speed/Hz Match 1469
Speed Signal Lost 121
Shutdown After Battle Short 1123
Short Circuit 1445
Remote Emergency Stop 1434
Pre-Low Oil Pressure Sensor 143

Compiled from service & troubleshooting documentation across every generator set that uses the Cummins/Onan 6CTA8.3.

Maintenance schedule

Item	Spec	Capacity	Part #
Air filter			AF4669	Amazon eBay $225.00
Fuel filter			3843760	Amazon eBay $74.95
Oil filter			3318853	Amazon eBay $74.95 NAPA $66.59
Battery			—
Belt			3911562	Amazon eBay $26.05
Coolant			—
Oil	Cummins Premium Blue 15W40	6.0 gal	3377363	Amazon eBay
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
Charge air piping	Check	50 hr		Daily or after 8 hours
Check Coolant Level	Check	8 hr		Daily
Check Fuel Level	Check	8 hr		Daily
Check Oil Level	Check	8 hr		Daily
Coolant level	Check	8 hr		Daily or after 8 hours
Drain Water from Fuel Filter	Drain	8 hr		Daily; drain 1 cup or more of fuel to remove water and sediment.
Engine oil level	Check	8 hr		Daily or after 8 hours
Fuel Filter(s)	Drain	8 hr		Drain 1 cup or more of fuel to remove water and sediment. Refer to engine operation and maintenance manual for procedure.
Fuel Tanks (water and sediment)	Drain	8 hr		Drain 1 cup or more of fuel to remove water and sediment.
Fuel level	Check	8 hr		Daily or after 8 hours
General genset inspection	Inspect	8 hr		Daily or after 8 hours. Check for oil, fuel, cooling and exhaust system leaks; check exhaust audibly and visually with set running.
Inspect Genset	Check	8 hr		Check for oil, fuel, cooling and exhaust system leaks. Check exhaust system audibly and visually with set running and repair any leaks immediately.
Inspect Set	Inspect	8 hr		Daily; check for oil, fuel, cooling, and exhaust system leaks.
Oil Level	Check	8 hr		Keep oil level near the dipstick high mark without overfilling.
Air Cleaner	Clean	50 hr		Clean if required. Perform more often in dusty conditions.
Air cleaner (clean if required)	Clean	50 hr		Weekly or after 50 hours; perform more often in dusty conditions
Battery charging system	Check	50 hr		Weekly or after 50 hours
Check Anti-freeze and DCA Concentration	Check	50 hr		Weekly
Check Battery Charging System	Check	50 hr		Weekly
Check Battery Level and Specific Gravity	Check	50 hr		Weekly
Check Coolant Heater	Check	50 hr		Weekly
Check Drive Belt Tension	Check	50 hr		Weekly; visually check belts for evidence of slippage.
Check Generator Air Outlet	Check	50 hr		Weekly
Coolant heater	Check	50 hr		Weekly or after 50 hours
Crankcase Oil	Drain	50 hr		First service — Break-in: drain and replace the crankcase oil after the first 50 hours of operation on new generator sets.
Crankcase oil	Change	50 hr		First service — Drain and replace after first 50 hours of operation on new generator sets.
Drain Exhaust Condensate Trap	Drain	50 hr		Weekly
Drain Water and Sediment from Fuel Tanks	Drain	50 hr		Weekly; drain 1 cup or more.
Exhaust condensate trap	Drain	50 hr		Weekly or after 50 hours
Water and sediment from fuel tank	Drain	50 hr		Weekly or after 50 hours; drain 1 cup or more of fuel to remove water and sediment
Check Air Cleaner (clean if required)	Check	100 hr		Monthly; clean if required; perform more often in extremely dusty conditions.
Clean Generator Assembly	Clean	100 hr		Monthly
Radiator hoses for wear and cracks	Inspect	100 hr		Monthly or after 100 hours
Starting batteries	Check	100 hr		Monthly or after 100 hours
Battery electrolyte level	Check	200 hr		Check at least every 200 hours of operation
Anti-freeze and DCA Concentration	Check	250 hr	3 mo	Refer to engine operation and maintenance manual.
Crankcase oil and filter	Change	250 hr	12 mo	Refer to Cummins Engine Operation and Maintenance Manual. Standby applications: change every 12 months or 250 hours, whichever comes first.
Drive Belt Tension	Check	250 hr	3 mo	Visually check belt for evidence of wear or slippage. Replace if hard or brittle. Refer to engine operation and maintenance manual.
Fuel Filters	Change	250 hr	3 mo	Refer to engine operation and maintenance manual.
Governor Adjustment	Check	250 hr	3 mo

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	Float switch lift below C-clip stop	1/8	inch (3 mm)
Clearance	Overspeed switch magnet-to-fly arm air gap (minimum)	0.005	inches (0.13 mm)
Gap	Mechanical overspeed switch air gap between magnet and fly arm (replace switch if less)	0.005	inches (0.13 mm)
Gap	Overspeed switch air gap	0.005 in. / 0.13 mm	in / mm
Other	AVR DROOP preset at factory	five percent droop at full load and zero power factor
Other	Battery electrolyte corrected specific gravity (fully charged)	1.260		electrolyte temperature corrected
Other	Battery electrolyte specific gravity, fully charged (corrected)	1.260		corrected to 80 °F (27 °C)
Other	Battery recharge threshold specific gravity	1.215
Other	Battery specific gravity	1.260		at 77°F (25°C)
Other	Battery specific gravity temperature correction	four gravity points (0.004) for every ten degrees above 80 F (27 C)
Other	Battery specific gravity, fully charged	approximately 1.260	at 80°F (27°C)
Other	Coolant level	50	mm	below radiator cap opening
Other	Cycle crank crank and rest time	7 to 20	seconds
Other	Cycle crank number of cycles	3, 4, or 5
Other	Cycle cranking (12-lamp control)	3 cycles of 15 seconds
Other	ECM fuse F1 (starter solenoid circuit)	20	amps
Other	ECM fuse F2 (fuel solenoid circuit)	20	amps
Other	ECM fuse F3 (continuous B+ to remote circuits)	15	amps
Other	ECM fuse F4 (ECM circuits)	5	amps
Other	ECM fuse F5 (engine gauge circuits)	5	amps
Other	Frequency adjustment range	±5%	%	genset running
Other	Fuse A31-F1 (control B+)	5	Amp	Engine Interface board
Other	Fuse A31-F3 (auxiliary B+)	5	Amp	Engine Interface board; panel lights, run and start relays
Other	Fuse A38-F1 (Network B+)	10	Amp	Governor Output Module
Other	Fuse A38-F2 (Switched B+)	10	Amp	Governor Output Module
Other	Fuse A38-F3 (Governor B+)	10	Amp	Governor Output Module
Other	Fuse TB-Bat F1 (Customer B+)	20	Amp	Engine Harness Assembly
Other	GOV RAMP adjustment range	0 through 10	seconds
Other	Generator voltage adjustment range via rheostat R21	+/-3 percent of rated nameplate voltage	percent
Other	Governor droop adjustment range	within 5	percent of nominal frequency (3 Hz for 60Hz sets, 2.5 Hz for 50Hz sets)
Other	LOP and HET fault time delay following starter disconnect	about 10 seconds	seconds
Other	Low oil pressure / high engine temperature fault time delay	about 10	seconds	following starter disconnect and inhibited during cranking
Other	Over/under voltage module time delay (to prevent nuisance tripping)	25 percent, or approximately 2.5 seconds	percent / seconds
Other	Overcrank limit (Sentinel)	60	seconds
Other	Overcrank limit (three 15-second cranking cycles with two 15-second rest periods)	75 seconds	seconds
Other	Overcrank option limit (Detector)	75	seconds
Other	Overcrank time limit	75	seconds
Other	Overspeed module time delay	typically one second	seconds
Other	Overspeed warning range 60 Hz sets	2000 to 2200	RPM
Other	REG VHZ adjustment range	1 through 50 (normal range 7 through 21)
Other	Random voltage variation	±1	%	for constant loads
Other	Response jumper setting - 90 to 550 kW	B to C
Other	Response jumper setting - over 550 kW	A to B
Other	Response jumper setting - under 90 kW	A to C
Other	Setup/calibration menu access code	574
Other	Standard cycle cranking (Detector)	three 15-second cranking cycles with two 15-second rest periods
Other	Start delay adjustment range	0 to 300	seconds	remote starting in Auto mode
Other	Starter disconnect speed	450 to 570	RPM
Other	Stop delay adjustment range	0 to 600	seconds	remote stopping in Auto mode
Other	Time delayed start / time delayed stop adjustment range	1 to 15 seconds (start); 1 to 15 seconds (stop); cool-down 3-5 minutes recommended	seconds / minutes
Other	Trailer brake shoe adjustment back-off	10	clicks
Other	Trailer surge brake actuator stroke length (service brakes if exceeds)	1	inch (25 mm)
Other	Under-frequency roll-off (UFRO) threshold, 50 Hz applications	49	Hz
Other	Under-frequency roll-off (UFRO) threshold, 60 Hz applications	59	Hz
Other	Voltage adjustment range	±5%	%	genset running
Other	Voltage regulation	±2	%	from no load to full load
Pressure	Engine oil pressure (normal)	30 to 65	psi (207 to 449 kPa)	at normal operating temperature
Pressure	Engine oil pressure range (low oil pressure troubleshooting)	25 to 65	psi (172 to 449 kPa)
Pressure	Fuel shutoff valve rating (TB1-8 and TB1-5)	not more than 0.5	amps	120 or 240 VAC
Pressure	Idle oil pressure	10 - 30	psi (69 - 207 kPa)	idle

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		soft water/E.G./DCA mixture			Installation review checklist item: cooling system must be filled with soft water/E.G./DCA mixture.
Coolant	50/50 mix of water and antifreeze	Balanced coolant mixture of water, antifreeze and coolant additives			Drain and replace the mixture every 6 months or after 500 hours of operation. Do not add cold coolant to a hot engine; allow engine to cool below 120 F (50 C) before adding coolant.
Engine oil		Refer to Cummins engine Operation and Maintenance Manual for lubricating oil classification			Gensets are shipped with oil added.
Engine oil	SAE 5W synthetic	API CC/CD; sulphated ash max 1.85%; pour point 9°F (5°C) below lowest expected temperature; viscosity max 10,000 mPa·s at -31°F (-35°C) and min 4.1 mm²/s at 212°F (100°C)	below -23°C		For ambient consistently below -10°F (-23°C) and no engine warm-up provision
Engine oil	10W-30	API CC/CD	-23°C to -10°C		For ambient -10°F (-23°C) to 14°F (-10°C)
Engine oil	15W-40	API CC/CD	above -10°C		For ambient 14°F (-10°C) and above
Engine oil	20W-40	API CC/CD	above 0°C		For ambient 32°F (0°C) and above
Fuel	Diesel				Do not use zinc coated or copper fuel lines with diesel fuel.
Fuel	No. 2 diesel				Engine primarily designed for No. 2 diesel; No. 1 fuel or similar acceptable if meets specifications
Fuel	diesel				Do not use zinc coated or copper fuel lines with diesel fuel.
Hydraulic oil	DOT-3				Trailer master cylinder reservoir - keep at least half full
Other	Starting battery electrolyte specific gravity			1.26 specific gravity	1.225 specific gravity recommended where ambient temperature is consistently above 95 F (35 C) to reduce electrolyte loss

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	Indicates that the engine is operating in idle mode; generator build-up is inhibited and engine governed at 800 RPM.	Warning	Remove ground from the engine idle input to return to normal speed and voltage.
102	EMERGENCY STOP	Indicates local or remote Emergency Stop.	Shutdown	Pull the button out; move the Run/Off/Auto switch to Off; press the Reset switch; select Run or Auto as required. Can only be reset at the PCC front panel.
1122	Rated/Idle Trans		Info
1123	Shutdown After Battle Short	A shutdown fault occurred while Battle Short was enabled and transitioned from enabled to disabled.	Shutdown	Review Fault History and perform corrective action.
1124	Delayed Shutdown	A shutdown fault became active while the Delayed Shutdown feature was enabled.	Warning	Review Fault History and perform corrective action.
1131	Battle Sh Active	Control is in Battle Short mode (bypasses several critical fault shutdowns).	Warning	None; used for genset operation during emergencies.
121	Speed Signal Lost	Mag pickup speed indication is not being sensed.	Shutdown	Restart and check RPM on digital display; inspect MPU wires/connector pins; check for 3.5 to 15 VAC at MPU while cranking.
1311	Customer Input #1		Warning	Optional customer selection (e.g., Low Fuel Day Tank, Water In Fuel, Ground Fault, Low Starting Hydraulic Pressure, Low Starting Air Pressure). Programmable: enable/disable, status/warning/shutdown, active closed or open, and display name.
1311, 1312, 1317, 1318	CUSTOMER INPUT #1 - #4	Optional customer-selected fault input is active.		Disconnect signal lead from TB1 and reset the control; check external wiring/active input selection.
1312	Customer Input #2		Warning	Optional customer selection; programmable (enable/disable, status/warning/shutdown, active open/closed, display name). Default #2 thru #4 - Warning.
1317	Customer Input #3		Warning	Optional customer selection; programmable (default #3 - Low Fuel).
1318	Customer Input #4		Warning	Optional customer selection; programmable (default #4 - Rupture Basin Fault).
1334	Crit Scaler Out Of Range	Incorrect feature or calibration was entered into control.	Shutdown	Reload correct feature/calibration file.
1335	Noncrit Scaler Out Of Range	Incorrect feature or calibration was entered into control.	Warning	Reload correct feature/calibration file.
1337	No Message		Info
135	Oil Pressure Sensor H	Engine oil pressure sender signal is shorted high.	Warning	Check sender/connectors/wires; verify fault simulation not enabled; check 0.5 to 4.5 VDC at P7-13 (OP OUT) and P7-17 (OP COM).
141	Oil Pressure Sensor L	Engine oil pressure sender signal is shorted low.	Warning	Check sender/connectors/wires; check for shorts/open circuits at P7-13, 17, 21.
1416	Fail To Shutdown	Genset continues to run after receiving shutdown command (Battle Short feature enabled).	Warning	Check Battle Short feature setting.
1417	Powr Down Error	Controller cannot power down because of an unknown condition.	Warning	Indicates controller cannot power down because of unknown condition. Possible drain on battery. Contact an authorized service center for service.
143	Pre-Low Oil Pres	Engine oil pressure dropped to an unacceptable level.	Warning	Indicates engine oil pressure has dropped below the warning trip point. If generator is powering critical loads and cannot be shut down, wait until next shutdown period and then follow code 415 procedure.
1433	Emergency Stop	Local Emergency Stop.	Shutdown	Pull the 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	Low Coolant Temp	Engine coolant heater is not operating or not circulating coolant (coolant <=70 F [21 C]).	Warning	Indicates engine coolant heater is not operating or is not circulating coolant. Check coolant heater power supply for blown fuse or disconnected cord; check for low coolant level and replenish; look for coolant leaks and repair.
1438	Fail To Crank	Engine failed to crank after the PCC received a start signal.	Shutdown	Test for B+ at the starter; check fuse F3 (2 Amps); check K4 start pilot relay and starter circuitry; refer to code 121.
144	Coolant Sensor High	Engine coolant temperature signal is shorted high.	Warning	Check sender/connectors/wires; check resistance between P7-30 (IH20) and P7-34 (IH20 COM).
1442	Weak Battery	During cranking battery voltage at or below weak battery trip point.	Warning	Recharge or replace battery; check electrolyte level and connections; check harness.
1443	Battery Failed	Dead battery - engine will not start.	Shutdown	See code 1438 instructions.
1444	KW Overload	Generator output power exceeded 105% of genset rating (3 sec at 110% of rated).	Warning	Check load and load lead connections; check CTs and CT connections.
1445	Short Circuit	Generator output current exceeded 175% of rated.	Shutdown	Check load and load lead connections (fault may not reset for several minutes).
1446	High AC Voltage	Phase voltage exceeded 130% of nominal, or 110% of nominal for 10 seconds.	Shutdown	Check fault simulation; clear fault and restart; refer to Generator/Base Board Isolation Procedure.
1447	Low AC Voltage	Phase voltage dropped below 85% of nominal for 10 seconds.	Shutdown	Check load; reconnect per reconnection diagram; check PMG/field wiring; check P8-21/P8-22 shunt connections.
1448	Under Frequency	Engine speed dropped below 90% of nominal for 10 seconds.	Shutdown	Check fuel supply, intake air supply and load; check P8 connections.
1449	Over Frequency	Frequency is 10% above base frequency for 20 seconds.	Warning	Check fuel or air delivery problem; repair P7/P8 connections.
145	Coolant Sensor Low	Engine coolant temperature signal is shorted low.	Warning	Check sender/connectors/wires; check for shorts at P7-30 and P7-34.
1452	Gen CB Not Close	Genset circuit breaker (S2) failed to close when PTC enabled.	Warning	Refer to Section 5.
1453	Gen CB Not Open	Genset circuit breaker (S2) failed to open when PTC enabled.	Warning	Refer to Section 5.
1459	Reverse Power	Improper CT phasing.	Shutdown	Check wiring to voltage sense circuit; refer to CT Installation in Section 6.
146	Pre-High Coolant Temp	Engine has begun to overheat (coolant temperature risen to an unacceptable level).	Warning	Reduce load; check air inlets/outlets and remove obstructions to airflow; if engine can be stopped follow code 151.
1461	Loss Of Field	Loss of field (electric) due to reverse kVAR.	Shutdown	Check field circuit.
1466	Modem Failure	Control cannot communicate with the modem.	Warning	Check for open, short circuit to ground, and loose connections to the modem.
1468	Network Error	Momentary loss of communication from the LonWorks Network.	Warning	Refer to the LonWorks Network publications.
1469	Speed/Hz Match	Measured speed and measured AC output frequency do not agree.	Shutdown	Check calibration file.
1471	Over Current	Generator output current exceeded 110% of rated for 60 seconds.	Warning	Check load and load lead connections.
1472	Over Current	Generator output current exceeded 110% of rated; time/current calculation initiated shutdown.	Shutdown	Check load and load lead connections (fault may not reset for several minutes).
151	High Coolant Temp	Engine has overheated (coolant temperature above the shutdown trip point).	Shutdown	Engine has overheated. Allow engine to cool completely, then: check coolant level and replenish and repair leaks; check for obstructions to cooling airflow; check fan belt and repair or tighten; check blower fan and circulation pumps on remote radiator installations; reset control and restart.
197	Low Coolant Level	Engine coolant level has fallen below the warning trip point.	Warning	Indicates engine coolant level has fallen below warning trip point. If generator is powering critical loads and cannot be shut down, wait until next shutdown period, then follow code 235 procedure. If engine can be stopped, follow code 235 procedure.
200	LOW OIL PRESSURE	Indicates engine oil pressure has dropped to an unacceptable level.	Warning	If powering critical loads, wait until next shutdown period and follow 201-SHUTDOWN procedure; check oil pressure via menu prior to clearing fault.
201	LOW OIL PRESSURE	Indicates engine oil pressure has dropped below the shutdown trip point.	Shutdown	Check oil level, lines and filters; replenish if low; reset control and restart. Oil pressure limits in Table 4-3.
204	OIL PRESS SENDER	The control has sensed that the engine oil pressure sender is out of its working range.	Warning	Check that the engine oil pressure sender is properly connected.
210	LOW COOLANT TEMP	Warning occurs when engine coolant temperature is 70°F (21°C) or lower, indicating the engine coolant heater is not operating or is not circulating coolant.	Warning	Indicates engine coolant heater is not operating or is not circulating coolant; check coolant heater power supply/fuse, low coolant level, and open heater element.
211	HIGH COOLANT TEMP	Indicates the engine coolant temperature is getting close to the recommended maximum temperature limit: 215°F (102°C) standby or 207°F (97°C) prime.	Warning	Reduce load if possible; check air inlets/outlets; follow 212-SHUTDOWN procedure if engine can be stopped.
212	Oil Temp Sensor H	Indicates engine has overheated (coolant temperature above the shutdown trip point: 223°F (106°C) standby or 215°F (102°C) prime).	Warning	Check sender/connectors/wires; check resistance between P7-22 (OIL TEMP) and P7-26 (OIL TEMP COM).
213	Oil Temp Sensor L	Resistance of the coolant temperature sender is out of range.	Warning	Check the resistance of the sender; should be 500 to 2k ohms.
214	LOW COOLANT LVL	Indicates engine coolant level has fallen below the trip point.	Warning	Check coolant level in radiator and coolant recovery bottle; look for leakage; reset control and restart.
215	LOW COOLANT LVL	Indicates engine coolant level has fallen below the trip point. LOW COOLANT LVL Shutdown will not occur if genset is in Idle mode (low coolant warning only).	Shutdown	Check coolant level in radiator and recovery bottle and replenish if low; check defective coolant bottle hose or radiator cap; reset control and restart after correcting problem. Will not occur in Idle mode.
220	MAG PICKUP	Mag pickup speed indication is not being sensed or does not match generator set output frequency.	Shutdown	Restart and check RPM on the digital display; isolate per troubleshooting table 4-18.
221	FAIL TO CRANK	Possible fault with control or starting system; engine will not crank.	Shutdown	Check fuse F3 on the Engine Interface board; clean battery cable connections; recharge or replace battery.
222	OVERCRANK	Possible fuel system problem; engine stops cranking.	Shutdown	Check for empty fuel tank, fuel leaks, or plugged fuel lines; check/replace dirty fuel filter and air filter; reset and restart.
223	OVERSPEED	Indicates engine has exceeded normal operating speed (115% ±1% of nominal).	Shutdown	Inspect the mechanical fuel linkage and repair or replace; check the EFC for binding or damage; monitor the PCC duty cycle display and replace A32 or A38 as indicated.
224	FAIL TO SYNCHRONIZE	The generator set has not synchronized to the system bus within the allowable time frame.		Check governor system stability and adjust governing/synchronizer parameters; check for fuel system problems causing engine instability; widen synchronizing window and reduce acceptance time delay.
226	FAIL TO CLOSE	Indicates that the paralleling breaker has been given a signal to close, but has not closed properly.		Verify charging mechanism of paralleling breaker; check the close signal to the breaker; verify auxiliary contact signals from the breaker to the control are operational.
230	LOW DC VOLTAGE	Indicates battery voltage is below 10 VDC.	Warning	Recharge or replace battery; clean/tighten connections; check engine DC alternator; check battery charger float level.
231	HIGH DC VOLTAGE	Indicates battery voltage exceeds 32 VDC.	Warning	Check voltage float level on battery charger if applicable (lower float level); check engine DC alternator and replace if normal battery charging voltage is not obtained.
232	WEAK BATTERY	Indicates battery voltage drops below 60% of nominal for two seconds, during starting.	Warning	Recharge or replace the battery; see 230 LOW DC VOLTAGE.
2327	PTC Fault	PTC module or communication link not working properly when PTC enabled.	Warning	Check blinking light on PTC module; check B+ TB3-3 to TB3-4; check PTC status voltage TB3-5 to TB3-6 (~0.2 VDC); repower control.
2329	Low S1 Frequency	Low utility (S1) frequency.	Warning	Check S1 AC inputs and wiring to PTC at TB5; check sensor set points.
2331	Low S1 Voltage	Low utility (S1) voltage.	Warning	Repower PCC 2100 control to clear; check S1 AC inputs at TB5; check S1 pickup/dropout set points.
2335	Excitation Fault	Loss of all three voltage sense leads or failure in excitation circuit.	Shutdown	Check field wiring (X1 and X2) for shorts or opens.
2336	Memory Error	Control memory error; data corruption of critical operating parameters.	Shutdown	Try reloading calibration file.
2337	Pwr Tran Disabled	PTC module available but PTC feature not enabled.	Warning	Use InPower to enable PTC feature; cycle power off for 5 seconds then repower.
2338	Pwr Tran Failure	PTC module trim enabled but control could not communicate with PTC module.	Warning	Check blinking light and B+ TB3-3 to TB3-4; check connections between TB2 and TB3; cycle power.
2339	Pwr Down Enabled	Power Down (sleep) function enabled but PTC module or network board is active.	Warning	None required.
234	Overspeed	Engine has exceeded normal operating speed.	Shutdown	Clear fault and restart genset; check fault threshold; monitor RPM; check electronic governor actuator.
2341	High Control Temp	Control temperature above normal (158 F [70 C]) for time greater than set time.	Warning	Check genset room air flow.
2342	Too Long In Idle (10 min.)	Genset has been in Idle mode too long.	Warning	Indicates genset has been in Idle mode too long (10 minutes maximum).
235	Low Coolant Level	Engine coolant level has fallen below the shutdown trip point.	Shutdown	Coolant level has fallen below the shutdown trip point. Allow engine to cool completely, then check coolant level and replenish, look for possible coolant leakage points and repair; reset control and restart.
2358	High S1 Voltage	Utility (S1) voltage increased above over voltage threshold.	Warning	Measure S1 AC inputs at PTC module; check utility nominal voltage; check sensor set points.
2396	S1 CB Not Close	Utility contact (S1) failed to close with PTC enabled.	Warning	Refer to Section 5.
2397	S1 CB Not Open	Utility contact (S1) failed to open with PTC enabled.	Warning	Refer to Section 5.
240	LOW FUEL-DAY	Indicates day tank fuel supply is running low.	Warning	Check fuel supply and replenish as required.

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

Procedures

Adjusting Values/Parameters adjustment

⚠ If Home button or Previous Main Menu button is pressed before pressing save symbol, changes are not saved.

Press button next to symbol in display until + and − symbols are displayed.
Press button next to arrow symbols to move to numeric character to change.
Press button next to + symbol to increase value or select parameter.
Press button next to − symbol to decrease value or select parameter.
After adjusting values/selecting parameters, press symbol to save changes.

Convert Day Tank Controller 240 VAC to 120 VAC adjustment

Remove the two jumpers between terminals TB1-6 and TB1-7.
Connect one jumper between TB1-5 and TB1-6 and the other between TB1-7 and TB1-8.
Move selector switch S103 on the control PCB to the up position for 120V.
If equipped with a transformer, remove jumpers between H2 and H3 and connect one between H1 and H3 and the other between H2 and H4.

Day Tank Controller Conversion 240 VAC to 120 VAC adjustment

Remove the two jumpers between terminals TB1-6 and TB1-7 and connect one between TB1-5 and TB1-6 and the other between TB1-7 and TB1-8.
Move selector switch S103 on the control PCB to the up position for 120V.
On the control transformer, remove the two jumpers between terminals H2 and H3 and connect one between H1 and H3 and the other between H2 and H4.

Dip Adjustment adjustment

Turn the DIP pot clockwise to increase the voltage vs frequency slope for frequencies below the UFRO threshold.
Greater slope gives greater voltage roll off as frequency drops, easing large load pickup but increasing voltage dip.
Turn the pot fully counterclockwise to make the slope the same above and below the threshold frequency.

Dwell Adjustment adjustment

Turn the DWELL pot clockwise to increase dwell time (voltage recovery time when frequency dips below threshold).
Turn the DWELL pot fully counterclockwise to eliminate dwell.
With no dwell, voltage recovery follows engine speed recovery.

Electric Governor Calibration Checks adjustment

Tools: Frequency meter or tachometer

Start the generator set.
Set no-load speed for desired droop (isochronous 60.0 Hz/1800 r/min).
With no load, turn GAIN clockwise until actuator lever oscillates; reduce until stable.
Reduce GAIN one division, then turn fully clockwise while observing lever.
Turn I adjustment counterclockwise until lever stable; it should oscillate up to 3 times.
Apply and remove loads to check response; recalibrate if unsatisfactory.

Electric Governor Preliminary Adjustments adjustment

Tools: Screwdriver

Set frequency adjust (engine speed) potentiometer to mid position and tighten locking nut.
Set I potentiometer one division from zero.
Set Gain potentiometer at the third division from zero.
For isochronous operation turn Droop potentiometer fully counterclockwise.
Turn droop screw to approximately 40 for 3 percent droop.
Turn droop screw to approximately 80 for 5 percent droop.

Fuel Pump Control: Convert 120 VAC to 240 VAC adjustment

Remove jumpers between TB1-5/TB1-6 and TB1-7/TB1-8; connect two jumpers between TB1-6 and TB1-7.
Move selector switch S103 on control PCB to down position for 240 VAC.
If equipped with a transformer, remove jumpers between H1/H3 and H2/H4 and connect two jumpers between H2 and H3.
Attach a tag to the control box indicating the supply voltage.

Fuel Pump Control: Convert 240 VAC to 120 VAC adjustment

Remove jumpers between TB1-6/TB1-7; connect one jumper TB1-5 to TB1-6 and one TB1-7 to TB1-8.
Move selector switch S103 on control PCB to up position for 120V.
If equipped with a transformer, remove jumpers between H2/H3 and connect one between H1-H3 and one between H2-H4.

Governor Adjustments (Type A Electric Governor) adjustment

Set selector switch S1 to OFF, S2 to appropriate model position.
Set pots initially: Gain 20%, I 20%, D 30%, Droop 0%.
Start set, adjust Speed pot for required frequency (60Hz=1800RPM or 50Hz=1500RPM) at operating temperature.
Disconnect load, turn Gain pot to 100% or until unstable, then back off until stable.
Adjust D and I pots similarly; readjust Speed if necessary.
Push throttle to minimum speed, release and observe overshoot (2-5 Hz acceptable); adjust I pot to reduce overshoot or hunting.

Initial Start Setup adjustment

⚠ Selecting this menu resets all operating parameters to default values; perform only by technically qualified personnel.

Press RESET, MENU and PHASE SELECT simultaneously to invoke the Initial Start Setup menu.
Toggle the Standby/Prime option.
Select the correct generator set model, frequency and kW rating.
Select the correct nominal line-to-line output voltage.
Select DELTA or WYE.
Select SAVE to save changes; MAIN MENU is then displayed.

Mechanical Governor Speed Adjustment adjustment

Tools: Frequency meter or tachometer, Wrench

Use the frequency control meter (if equipped) or an accurate tachometer.
Loosen the speed adjustment screw locknut.
Start set, warm to operating temperature, then apply full rated load.
Adjust speed adjust screw in or out to reach required speed (60 Hz - 1800 r/min, 50 Hz - 1500 r/min).
Hold screw at proper setting and retighten locknut.
Remove and apply loads to check response; readjust if necessary.

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
		AVR response jumper	A to C	For generator output 90 kW or less (SX440 and MX321)
		Auxiliary terminal board TB21	K1, K2, P2, P3, P4, S2, S1, A2, A1	A1 and A2 connect a VAR/power factor controller when paralleling with a utility; S1 and S2 connect a droop compensating CT when paralleling with a generator set or utility
		CT1 - U load leads (A phase); CT2 - V load leads (B phase); CT3 - W load leads (C phase)	6 lead gensets: generator output leads routed through CTs; 12 lead gensets: load wires routed through CTs	12-lead sets have dual secondary CTs (3 pins); 6-lead sets have single secondary CTs (2 pins)
		Day tank LO SHUTDOWN engine shutdown connection	TB1-14 to engine block ground; TB1-15 to TB2-16 on the ECM
		Fault relay K8/K9 (Dry Contact Module)	K8=Over Crank, Low Oil Pressure, High Engine Temperature, Low Coolant Level, Low Fuel Level; K9=Low Fuel Level, Rupture Basin	Contact ratings: 40A max carry/break N.O. 12V coil, 30A N.C. 12V coil, 20A N.O./10A N.C. 24V coil
		MX321 PMG-excited jumper positions	2-3, 4-5 and 6-7	These jumpers must be in these positions
		MX321 voltage regulator frequency jumper	3-2 for 50 Hz; 3-1 for 60 Hz
		SX440 voltage regulator frequency jumper	C-50 for 50 Hz; C-60 for 60 Hz
		TB3 (ECM alternative RUN/STOP/REMOTE connection)	TB3-1=REMOTE, TB3-2=RUN, TB3-3=STOP	Provides alternative direct connection to ECM for troubleshooting or customer connection
		Voltage trimmer R21	voltage regulator terminals 1 and 2	There must be a jumper between terminals 1 and 2 when voltage trimmer R21 is not used
	single phase	QSG-Series power distribution panel voltage selector switch S1 position	main output terminals	Rotary switch under lockable cover selects 120/240 VAC single phase
	single phase	Voltage regulator terminal 6	jumpered to terminal 8	When the generator is connected for single-phase output, terminal 6 is not connected to the isolation transformer
	three phase	QSG-Series power distribution panel voltage selector switch S1 position	main output terminals	Rotary switch selects 120/208 VAC three phase
110/190	3
110/220	1
110V - 120V L-N	Single phase, 2-wire	Jumper locations for single phase, 2-wire		PTC Module AC wiring (0300-5382-01, -02)
115/220	3
115/230	1			Generator voltage connections (reconnectable type only) per Figure 5-20; single phase double delta connection will reduce set rating and may not work with 3-phase meters
120	single phase	Day tank fuel pump control power reconnection	move jumpers from TB1-6/TB1-7 to TB1-5/TB1-6 and TB1-7/TB1-8	Move selector switch S103 on the control PCB to the up position for 120 V (factory set for 240 V, S103 down)
120/208	3
120/240	1
127/220	3
139/240	3
190, 200, 208, 220, 230, 240, 380, 416, 440, 460, 600 (L-L)	3 (three phase)	3 or 4 wires		Voltage Configuration submenu; default = 3Ph 208V 4W
190V - 240V L-L	Three phase	Jumper locations for three phase, 190V-240V L-L		Use 0300-5382-01 for 190V-240V L-L, 50/60 Hz
200, 220, 230, 240 (L-L)	1 (single phase)	3 wires		Voltage Configuration submenu (Governor/Regulator Setup)
200V - 240V L-L	Single phase, 3-wire	Jumper locations for single phase, 3-wire		PTC Module AC wiring
220/380	3
220/480	3
230/400	3

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 6CTA8.3 family

300

Part #	Description	Category
140-2241	Element, Air Cleaner	Air filter
140-2251	Element, Air Cleaner Secondary (Inner)	Air filter
140-2252	Element, Air Cleaner - Secondary (Inner)	Air filter
3833680	Bracket, Air Cleaner	Air filter
3837348	Cleaner, Air	Air filter
3919520	Bracket, Air Cleaner	Air filter
AC9055-01	Air Cleaner	Air filter
AF4669	Air Cleaner	Air filter
3016627	Alternator	Alternator
3016628	Alternator	Alternator
309-0561	Alternator & Drive Components Group Pulley. Alternator - Multi Groove (Use with 35 A MP Alternator)	Alternator
130-3216	V-belt	Belt
3897933	Bracket, Belt Guard	Belt
3897934	Bracket, Belt Guard	Belt
3897937	Bracket, Belt Guard	Belt
3911562	Belt	Belt
3921633	Guard, Belt	Belt
3922900	Tensioner, Belt	Belt
3925697	Bracket, Belt Tensioner	Belt
405-5832	Door, Housing	Door
3377363	Lube Oil, Cummins Premium Blue 15W40 (one-gallon jugs)	Fluid
3843760	Fuel Filter (Fleetguard FS1251 equivalent)	Fuel filter
102-1356	Gasket, Oil Drain	Gasket
3519762	Gasket, Turbocharger	Gasket
3914303	Gasket, Gear Housing (Front-Gear-Cover group BP9733-04)	Gasket
3914311	Gasket, Int Manifold Cover	Gasket
3916300	Gasket, Turbocharger	Gasket
3917779	Gasket, Gear Cover (Front-Gear-Cover group BP9733-04)	Gasket
3918779	Gasket, Connection	Gasket
3921691	Gasket, Exh Out Connection	Gasket
3931350	Gasket, Oil Drain	Gasket
3931608	Gasket, Acc Drive Cover	Gasket
406-0831	Hinge, Door	Hinge
106334	Hose, Plain	Hose
210753	Clamp, Hose	Hose
3025152	Hose, Plain	Hose
3283227	Coupling, Plain Hose	Hose
3905084	Hose, Flexible	Hose
3907167	Coupling, Plain Hose	Hose
3911875	Hose, Flexible	Hose
3911880	Coupling, Elbow Hose	Hose
3912183	Hose, Plain	Hose
3913724	Hose, Plain	Hose
3913751	Hose, Plain	Hose
3916529	Hose, Plain	Hose
3918163	Clamp, Hose	Hose
3918521	Clamp, Hose	Hose
3918607	Hose, Elbow	Hose
3918611	Hose, Plain	Hose
3920762	Hose, Elbow	Hose
3925025	Hose, Molded	Hose
3931970	Hose, Plain	Hose
501-0441	Line, Fuel - Flex (Fuel In)	Hose
503-0197	Clip, Hose	Hose
503-0365	Clamp, Hose	Hose
503-0446	Clamp, Hose	Hose
503-0465	Clamp, Hose	Hose
503-0685	Clamp, Hose	Hose
503-1595	Hose	Hose
503-1599	Hose, Radiator	Hose
155-3150-04	Muffler, Critical	Muffler
502-0047	Nipple, Pipe (1/4)	Nipple
3318853	Combination Full-Flow/Bypass Lubricating Oil Filter	Oil filter
102-1237	Adapter, Drain-Oil	Service part / kit
102483	End, Control Rod	Service part / kit
108722	Clip	Service part / kit
127007	Screw, Pan Head Cap	Service part / kit
130-3212	Advanced Efficiency Hydraulic/Transmission Filter	Service part / kit
140-1260	Fitting, Safety Filter	Service part / kit
140-1548	Indicator, Service	Service part / kit
140-2240	Cleaner, Air (Incl Element)	Service part / kit
140332	Clamp, T Bolt	Service part / kit
146159	Washer, Plain	Service part / kit
146160	Washer, Plain	Service part / kit
155-2307	Silencer	Service part / kit
180371	Clip	Service part / kit
203555	Connection, Exhaust Outlet	Service part / kit
204991	Washer, Plain	Service part / kit
213365	Screw, Hexagon Head Cap	Service part / kit
3007636	Plug, Expansion	Service part / kit
3008468	Plug, Pipe 1/2 NPT	Service part / kit
3010596	Screw, Captive Washer Cap	Service part / kit
3018006	Screw, Hexagon Head Cap	Service part / kit
3026910	Cable	Service part / kit
3028870	Connection, Tur Oil Inlet	Service part / kit
3030871	Gauge, Pressure	Service part / kit
3030872	Gauge, Temperature	Service part / kit
3031348	Flange, Power Takeoff	Service part / kit
3031643	Rectifier	Service part / kit
3032105	Bearing, Ball	Service part / kit
3033379	Control, Vernier	Service part / kit
3033800	Washer, Plain	Service part / kit
3035083	Isolator, Vibration	Service part / kit
3035084	Isolator, Vibration	Service part / kit
3039554	Switch, Push Button	Service part / kit
3039570	Ammeter	Service part / kit
3049554	Hourmeter & Tachometer	Service part / kit
3050323	Speed Switch, Electronic	Service part / kit
309-0553	Switch, Temperature-Pre Water	Service part / kit
309-0554	SWITCH WATER	Service part / kit
3175239	Nut, Lock	Service part / kit
3284244	Connector, Female	Service part / kit
332-1473	Lug, Solderless	Service part / kit
3393823	Bolt, Carriage	Service part / kit
3885910	Red Paint, Spray can	Service part / kit
3900629	Screw, Hex Flange Head Cap	Service part / kit
3900630	Screw, Hex Flange Head Cap	Service part / kit
3900631	Screw, Hex Flange Head Cap	Service part / kit
3900632	Screw, Hex Flange Head Cap	Service part / kit
3900633	Screw, Hex Flange Head Cap	Service part / kit
3901249	Screw, Hex Flange Head Cap	Service part / kit
3901757	Screw, Hex Flange Head Cap	Service part / kit
3902115	Screw, Hex Flange Head Cap M12 x 1.75 x 65	Service part / kit
3902468	Cap, Filler	Service part / kit
3902662	Nut, Hexagon Flange	Service part / kit
3903463	Cover, Access Hole	Service part / kit
3903990	Screw, Hex Flange Head Cap	Service part / kit
3904971	Connection Water Transfer	Service part / kit
3905156	Shim A/R 1.00 mm Thick	Service part / kit
3905157	Shim A/R 1.04 mm Thick	Service part / kit
3905158	Shim A/R 1.08 mm Thick	Service part / kit
3905159	Shim A/R 1.10 mm Thick	Service part / kit
3905160	Shim A/R 1.14 mm Thick	Service part / kit
3905161	Shim A/R 1.18 mm Thick	Service part / kit
3905162	Shim A/R 1.20 mm Thick	Service part / kit
3905163	Shim A/R 1.24 mm Thick	Service part / kit
3905164	Shim A/R 1.28 mm Thick	Service part / kit
3905165	Shim A/R 1.30 mm Thick	Service part / kit
3905166	Shim A/R 1.34 mm Thick	Service part / kit
3905167	Shim A/R 1.38 mm Thick	Service part / kit
3905168	Shim A/R 1.40 mm Thick	Service part / kit
3905169	Shim A/R 1.44 mm Thick	Service part / kit
3905170	Shim A/R 1.48 mm Thick	Service part / kit
3905171	Shim A/R 1.50 mm Thick	Service part / kit
3905172	Shim A/R 1.54 mm Thick	Service part / kit
3905173	Shim A/R 1.58 mm Thick	Service part / kit
3905174	Shim A/R 1.60 mm Thick	Service part / kit
3905175	Shim A/R 1.64 mm Thick	Service part / kit
3905176	Shim A/R 1.68 mm Thick	Service part / kit
3905177	Shim A/R 1.70 mm Thick	Service part / kit
3905178	Shim A/R 1.74 mm Thick	Service part / kit
3905180	Shim A/R 1.78 mm Thick	Service part / kit
3905181	Shim A/R 1.80 mm Thick	Service part / kit
3905182	Shim A/R 1.84 mm Thick	Service part / kit
3905183	Shim A/R 1.88 mm Thick	Service part / kit
3905184	Shim A/R 1.90 mm Thick	Service part / kit
3905185	Shim A/R 1.94 mm Thick	Service part / kit
3905186	Shim A/R 1.98 mm Thick	Service part / kit
3906436	Tube, Water Inlet	Service part / kit
3906439	Plate, Clamping	Service part / kit
3906619	Plug, Pipe	Service part / kit
3906715	Screw, Hex Flange Head Cap	Service part / kit
3906733	Screw, Hex Flange Head Cap	Service part / kit
3907978	Stud M10 x 1.50(Both Ends) x 50	Service part / kit
3908402	Tube, Water Outlet	Service part / kit
3910901	Screw, Hex Flange Head Cap	Service part / kit
3911670	Manifold, Exhaust	Service part / kit
3912151	Plate, Clamping	Service part / kit
3912159	Connection, Water Outlet	Service part / kit
3914502	Aftercooler	Service part / kit
3914868	Plate, Cover	Service part / kit
3915772	Seal, Rectangular Ring (Front-Gear-Cover group BP9733-04)	Service part / kit
3916326	Connection, Exhaust Outlet	Service part / kit
3916518	Screw, Hex Flange Head Cap M10 x 1.50 x 125	Service part / kit
3916585	Screw, Hexagon Head Cap	Service part / kit
3917394	Connection, Water Transfer	Service part / kit
3918109	Screw, Hex Flange Head Cap M8 x 1.25 x 25	Service part / kit
3918192	Washer, Sealing	Service part / kit
3918498	Screw, Hex Flange Head Cap M10 x 1.50 x 145	Service part / kit
3918500	Tube, Air	Service part / kit
3918542	Spacer, Mounting	Service part / kit
3918927	Connection Water Transfer	Service part / kit
3919461	Block, Terminal	Service part / kit
3919462	Harness, Wiring	Service part / kit
3919465	Cabinet, Instrument	Service part / kit
3919467	Decal	Service part / kit
3919563	Tube, Water Transfer	Service part / kit
3919577	Heater, Engine	Service part / kit
3919578	Panel, Instrument	Service part / kit
3919585	Panel, Eng Instrumentation	Service part / kit
3919687	Connector, Female	Service part / kit
3919748	Dataplate	Service part / kit
3919750	Brace, Exh Out Connection	Service part / kit
3919751	Shield, Heat	Service part / kit
3919814	Connection, Tur Oil Drain	Service part / kit
3919815	Tube, Tur Oil Drain	Service part / kit
3919871	Bracket, Cable	Service part / kit
3921533	Shield, Dust	Service part / kit
3921724	Tag, Identification	Service part / kit
3923360	Plate, Clamping	Service part / kit
3924389	Washer, Sealing	Service part / kit
3924798	Shaft, Idler	Service part / kit
3925186	Screw, Flat Head Cap	Service part / kit
3925568	Damper, Vibration	Service part / kit
3925749	Connector, Banjo	Service part / kit
3925883	Screw, Hex Flange Head Cap	Service part / kit
3926125	Screw, Hexagon Head Cap	Service part / kit
3926901	Pulley, Idler	Service part / kit
3930678	Tube, Vent	Service part / kit
3930903	Cover, Valve	Service part / kit
3931827	Tube, Tur Oil Drain	Service part / kit
402-0030	Part 402-0030	Service part / kit
41320-D	Shaft, Stub	Service part / kit
416-0444	Cable, Battery - Negative	Service part / kit
416-0619	Cable, Battery	Service part / kit
501-0480	Line, Fuel - Flex (Fuel Out)	Service part / kit
504-0011	Valve, Shutoff (1/2”)	Service part / kit
505-0021	Bushing, Pipe - Reducer (3/4º to 1/2º)	Service part / kit
505-0050	Elbow, Street (1/2' x 90 ° )	Service part / kit
505-0185	Nipple, Half (1/2' x 1.5' lg)	Service part / kit
508-0015	Washer, Insulating - Fiber (#8)	Service part / kit
508-0231	Bumper Switch, Selector	Service part / kit
526-0003	#Washer, Flat (#8)	Service part / kit
526-0008	148-036’?	Service part / kit
526-0219	Washer, Flat (1/2)	Service part / kit
526-2140	Washer, Flat (M12)	Service part / kit
554802	Washer, Plain	Service part / kit
5818824	Nut, Hexagon Flange M10 x 1.50	Service part / kit
62399-N	Key, Square	Service part / kit
70208	Screw, Pan Head	Service part / kit
800-0008	Screw, Cap - Hex Head (1/'4-2Ox 1-1/4')	Service part / kit
800-0026	Screw, Cap - Hex Head (5/16-18 X 3/4')	Service part / kit
800-0091	Part 800-0091	Service part / kit
800-0520	Screw, Cap - Hex Head - Self Locking 3/4-10 x 1"	Service part / kit
800-2058	Screw, Cap - Hex Head (M8 x 1.25 x 25)	Service part / kit
800-2088	Screw, Cap - Hex Head	Service part / kit
800-2110	Hood, Inlet - Air Molded	Service part / kit
800-2111	Screw, Cap - Hex Head (M12 x 1.25 x 25mm)	Service part / kit
809-0035	Screw, Machine - Thread Cutting, Round Head (#8 X 3/4')	Service part / kit
815-0172	Cover, Adapter Outlet	Service part / kit
818-0150	Rivet	Service part / kit
821-0014	2 821-0018 1 3 526-0018 2 4 856-0006 1 5 870-0212 1 6 NOTE 1 REF 7 NOTE 1 REF 8 NOTE 1	Service part / kit
821-0018	Screw, Self-locking - Hex Washer Head ( 1'4.20 x 5 8')	Service part / kit
821-0029	Screw, Self–Locking – Hex Washer Head (3/8–16 x 3/4")	Service part / kit
821-6003-02	Screw, Cap - Hex Head (M8 x 1.25 x 25mm)	Service part / kit
850-0030	Washer, Lock - Spring (#10)	Service part / kit
850-0060	Screw, Cap - Hex Head (5/16-18 X 7-1/2" )	Service part / kit
850-2005	Washer, Lock - Spring (M5)	Service part / kit
850-2008	Washer, Lock (M8)	Service part / kit
850-2010	Lock	Service part / kit
850-2012	Washer, Lock - Spring (M12)	Service part / kit
856-0008	Washer, Lock - EIT (5/16'1)	Service part / kit
856-0013	Washer, Lock - W/EIT (1/2)	Service part / kit
860-2006	Genset component (SJB series)	Service part / kit
862-0004	4 ttNut, Hex - Set Mounting - Key 2 HARDWARE SET, SET MOUNTING	Service part / kit
862-0016	Nut, Hex	Service part / kit
863-0002	Cleaner, Air (Includes Element)	Service part / kit
870-0048	Nut, Self-locking - Hex (5/16-18)	Service part / kit
870-0053	Nut, Hex (s10-32)	Service part / kit
870-0196	Nut, Insulating (#8)	Service part / kit
870-0212	Nut, Locking (1/4-20)	Service part / kit
870-0257	Nut, Locking (5/16−18) * − Parts Used On Heat Exchanger Installations With Automatic Water Regulator # − Cut Off And Discard Swivel Connector End Of Hose So That 1/8 NPT Connector End Measures Length As Indicated Above + − Parts Used On Heat Exchanger Installations Without Automatic Water Regulator	Service part / kit
870-0281	Nut, Self-Locking – Hex Washer Head (3/8–16)	Service part / kit
871-0010	Nut, Hex - Srass (#10-32) Washer, Lock - EIT (#10) Washer, Lock - IT (#10)	Service part / kit
S-1008-1	Connector, Female	Service part / kit
S-103-D	Screw, Hexagon Head Cap	Service part / kit
S-114	Screw, Hexagon Head Cap 1/4 - 20 X 3/4 Inch.	Service part / kit
S-115	Screw, Hexagon Head Cap	Service part / kit
S-118	Screw, Hexagon Head Cap	Service part / kit
S-118-A	Screw, Hexagon Head Cap	Service part / kit
S-168-C	Screw, Hexagon Head Cap	Service part / kit
S-224	Nut, Heavy Hexagon	Service part / kit
S-225	Nut, Heavy Hexagon Jam	Service part / kit
S-257	Nut, Regular Hexagon	Service part / kit
S-511	Pin, Cotter	Service part / kit
S-600	Washer, Lock 1/4 inch	Service part / kit
S-608	Washer, Lock	Service part / kit
S-622	Washer, Plain 3/8 inch	Service part / kit
S-907-B	Union, Plain Female	Service part / kit
S-920	Nipple, Plain Pipe	Service part / kit
S-960	Tee, Female Pipe	Service part / kit
S-962-E	Draincock	Service part / kit
405-5908	Panel, Side - Radiator Housing	Panel
405-5917	Panel, End - Roof	Panel
155-3164-01	Pipe, Exhaust	Pipe
405-5744	Post, Housing - Center	Post
405-5916	Post, Corner - Housing	Post
3802975	Pump, Water	Pump
3929614	Pump, Water	Pump
145530	Seal, O Ring	Seal
3819725	Clamp, Hose	Seal
3902089	Seal, O Ring	Seal
3902466	Seal, Rectangular Ring	Seal
3903475	Seal, Rectangular Ring	Seal
3905449	Seal, Rocker Lever Cover	Seal
3907177	Seal, Rectangular Ring (Cylinder-Block group BP97003)	Seal
3908139	Front Seal Service Kit, includes installation tools (Front-Gear-Cover group BP9733-04)	Seal
3910824	Seal, O Ring	Seal
3913994	Seal, O Ring (Front-Gear-Cover group BP9733-04)	Seal
3931824	Seal, O Ring	Seal
193-0244	Sender, Pressure - 0i1	Sensor
193-0353	Sender, Temperature - Oil	Sensor
193-0375	# Sender, Water Temperature	Sensor
309-0269	Sender, Temperature-Lo Engine	Sensor
3921402	Motor, Starting	Starter
3921403	Starter 24V	Starter
3926534	Housing, Thermostat	Thermostat
3928639	Thermostat	Thermostat
526-0451	Washer, Flat - Stainless Steel (M8)	Washer
319-2653	Window, Control (If Equipped)	Window

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 6CTA8.3?

The Cummins/Onan 6CTA8.3 engine has an oil capacity of 19.0 liters.

What is the displacement of the Cummins/Onan 6CTA8.3?

The Cummins/Onan 6CTA8.3 has a displacement of 8.3 liters with 6 cylinders.

Which generators use the Cummins/Onan 6CTA8.3 engine?

The Cummins/Onan 6CTA8.3 powers 3 generator set(s), including Cummins/Onan 6CTA8.3 series engine, Cummins/Onan DGFA, Cummins/Onan DGFB.

What is a common problem with the Cummins/Onan 6CTA8.3 engine?

A commonly reported issue on generators using the Cummins/Onan 6CTA8.3 is: Over Current.

Cummins/Onan 6CTA8.3 Engine

Engine specifications

Generator sets powered by this engine

Troubleshooting

Fault codes

Common problems

Maintenance schedule

Repair guides

Service intervals

Service specifications

Recommended fluids

Fault codes

Procedures

Voltage reconnection

Parts cataloged across the Cummins/Onan 6CTA8.3 family

Common questions