Cummins/Onan — Mounting the Power Unit to the Side Rail
Installation · power unit mounting
From a Cummins/Onan service manual covering: ES2075s, FS1870s, M11979s, M1976s, M1977s, M1978s. Check it applies to your exact model before use.
Applies to: Kubota 2482B engine
Before you start
- Dropping the power unit can cause severe personal injury or death.
- Do not drill holes into the tractor rail; drilling will damage it and could cause it to bend or break.
- Over tightening the mounting bracket bolts can damage the angle brackets.
Procedure
- Remove shipping carton staples and carefully lift the carton off the power unit.
- Leave the power unit skid base on the unit until it has been mounted on the rails.
- Raise the power unit onto a forklift or floor jack and make sure it is stable.
- Remove or relocate accessories that interfere with mounting of the power unit.
- Mark the rail 18 inches (457 mm) apart to indicate the mounting location.
- Inspect the rail and angle brackets for interference and relocate the unit if found.
- Maintain 2 inches (50.8 mm) clearance at the air inlet and in front of the radiator.
- Remove mounting screws from the back of both side panels.
- Assemble the spacer and then the angle bracket to the side panels.
- Tighten angle bracket mounting bolts to 32 ft lbs (43 N·m).
- Secure clamps to the rails with 5/8-inch bolts, flat washers and lock nuts; do not tighten yet.
- Tighten top mounting bracket bolts to 50 ft lbs (68 N·m), then bottom bolts to 50 ft lbs (68 N·m).
- Lower the jack, remove the four skid base bolts, remove skid base and reinstall the bolts to 32 ft lbs (43 N·m).
- Remove the cardboard covering the radiator/condenser outlet and check U-joint alignment.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Angle bracket mounting bolts: 32 ft lbs (43 N·m)
- Mounting bracket bolts: 50 ft lbs (68 N·m)
Source: Cummins/Onan service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.