HomeCummins/OnanCummins/Onan HGJAF

Cummins/Onan HGJAF Generator Set

The Cummins/Onan HGJAF is a generator set.

3
Document types

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

Specifications

Ratings spec sheet not in our library yet — see the documents below.

Maintenance & consumables

ItemSpecCapacityPart #Interval
Air filter1000 hr find
Fuel filter500 hr find
Oil filter500 hr find
Belt8 hr find
Coolant2 hr
Oil500 hr

Troubleshooting

31

Fault codes

CodeMeaning
2Low Oil Pressure Fault
3Service Check Fault
4Overcrank
12Overvoltage
13Undervoltage
14Overfrequency
15Underfrequency
17Fuel Pump Fault
19Governor Actuator (EFI Only)
22Governor Actuator Overload (EFI Only)
23Oil Pressure Switch Fault
27Voltage Sense Lost
29High Battery Voltage
31Overspeed Fault
32Low Cranking Speed Sense
33Fault Code 3 - Fault Code 33
35Control Card Failure
36Generator Set Stopped Without Fault Condition - Fault Code 36
37Invalid Set Configuration
38Field Overload (Overvoltage)
41Alternator Rotor Fault
42Processor Fault - Fault Code 42
43Processor Fault - Fault Code 43
45Speed Sense Fault
47Ignition Fault
48Field Sense Fault
51Processor Failure - Fault Code 51
52Fuel Injector Fault (EFI Only)
54MAT Sensor Fault (EFI Only)
56MAP Sensor Fault (EFI Only)
57Overprime Fault

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

Parts

8
Part #DescriptionQtySystem
172082383.1L, 196.5g working capacityCarbon canister buy
172082523.3L, 233.8g working capacityCarbon canister buy
0420-0603Bypass Control Board Tester1Service part / kit buy
0541-1143Bypass Control Board Tester Adapter Kit1Service part / kit buy
0541-1287Harness Kit for InPower Diagnostic Service Tool1Service part / kit buy
0541-1374InPower Harness Kit (Spec J and later)1Service part / kit buy
0541-1389Harness Kit for InPower Diagnostic Service Tool1Service part / kit buy
500-3450OUTLINE DRAWING—HGJAFService part / kit buy

Service, wear & replacement parts referenced for this model and its engine — confirm the exact part for your serial number. See the full parts catalog to search and cross-reference.

Fuel consumption

RatingLoadL/hgal/h
Full load5.32.4
Half load3.91.8
No load2.21.0
Prime
Standby

Available documents

Installation manualParts manualService manual