HomeCummins/OnanCummins/Onan 2.5HJBAA

Cummins/Onan 2.5HJBAA Generator Set

The Cummins/Onan 2.5HJBAA is a generator set. It is available at 120 V, rated 25 A. The set weighs about 22.7 kg (50 lb).

3
Document types

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

Specifications

Voltage options120 V
Rated current25 A
Circuit breaker20 A
Battery voltage12 V
Dry weight22 kg

Filters & service parts

model family
ItemSpecCapacityPart #Interval
Air filter find
Fuel filter find
Oil filter find
Belt find
Coolant
Oil

Compiled from this model's family documentation — may include parts for closely-related variants. Confirm the exact part for your serial number.

Troubleshooting

4

Fault codes

CodeMeaning
RedActive Fault is present

Symptoms & remedies

SymptomRemedy
The numeric Fault Code, a brief description of the fault and the time when the fault occurred (accumulated run time in hours) are displayed.Press BACK to clear the fault. The red FAULT LED on the Display will turn off. See Troubleshooting (p. 47) to determine the cause of the fault and the corrective actions that may be taken.
An active Fault is checked by going to FAULT INFO.If there is an active fault, the FAULT INFO screen will display the numeric Fault Code, a brief description of the fault and the time when the fault occurred. If there is no active fault, the screen will state, “No Active Faults.”
Up to 5 of the most recent faults (fault history) are checked by pressing HIST on the FAULT INFO screen.Press / to page through the 5 faults. If there is no fault history, the screen will state, “No Stored Faults.”

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

Parts

32
Part #DescriptionQtySystem
193-0530*Sensor, Temperature (Battery) (not shown)3Sensor PartsGeek
300-6019Control, Remote1Control PartsGeek
319-4741*Cover, Terminal Block1Cover PartsGeek
320-222915 Amp Breaker2Breaker PartsGeek
320-223020 Amp Breaker2Breaker PartsGeek
332-3846Block, Terminal (16 Places)1Block PartsGeek
405-7207-02Cover, Access (Wiring Space)1Cover PartsGeek
405-7705-02Enclosure (Chassis)1Enclosure PartsGeek
526-0029*Washer, Flat (1/2")1Washer PartsGeek
541-0918Kit, Sensor (Battery Temp) (Includes Parts Marked *)1Kit PartsGeek
541-0919Kit, Harness (Keypad, 25') (Includes Parts Marked >)1Kit PartsGeek
541-0928Fuse (200 Amp)1Fuse PartsGeek
541-0929Fuse (300 Amp)1Fuse PartsGeek
541-0930Fuse (400 Amp)1Fuse PartsGeek
541-0932Kit, Harness (Keypad, 50') (Includes Parts Marked #)1Kit PartsGeek
541-0969Kit, Harness (Start / Stop) (Includes Parts Marked %)1Kit PartsGeek
541-0970Kit, Service (Includes Removal Tool and Harness)1Kit PartsGeek
541-0979Kit, Fan (Includes Bracket and Fan)1Kit PartsGeek
541-0982Kit, Installation (Cover) (Includes Parts Marked *)1Kit PartsGeek
541-1182Kit, Harness (EXT Wake) (Includes Parts Marked ~)1Kit PartsGeek
541-1183Kit, Remote Control (Includes Remote Control)1Kit PartsGeek
815-0862*Screw, Pan Head Torx (M4 x 10mm)3Screw PartsGeek
819-1158Screw, Pan Head Mach Xrec4Screw PartsGeek
823-0002-02*Screw, Pan Head Thread Form Torx (M4 x .7 x 25mm)2Screw PartsGeek
98-6476Label, Ground1Label PartsGeek
98-8071*Label, Warning (not shown)1Label PartsGeek
98-8074Label, Information (Wiring)1Label PartsGeek
98-8075Label, Instruction (Ground)1Label PartsGeek
98-8119Label, Warning (Main)1Label PartsGeek
98-8126-01Label, Information (15/15 Amp Rating)1Label PartsGeek
862-0003*Nut, Hex (3/8")1Service part / kit PartsGeek
870-2054Nut, Flanged Locking (M6)5Service part / kit PartsGeek

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
Prime
Standby

Available documents

Owner's manual — 901-0606 Onan Equinox Inverter-Charger Manual (Cummins/Onan)Parts manual — 901-0200B Onan HJBAA Inverter- Chargers Parts (12-2008) (Cummins/Onan)Service manual — 901-0606C Onan HJBBA Inverter-Charger Operations Installation Service (04-2004) (Cummins/Onan)