Cummins/Onan — Generator Mount Pre-load Adjustment

Adjustments · Generator mount / vibration isolators

From a Cummins/Onan service manual — check it applies to your exact model before use.

Applies to: Cummins/Onan DFE

Procedure

1. Turn off and disconnect battery charger (if equipped).
2. Disconnect the negative (-) battery cable(s) to prevent accidental starting.
3. Unscrew bolt (Item 2) from skid but do not remove from either rear engine vibration isolator.
4. Loosen the three screws that secure the engine mount brackets to the engine.
5. Loosen but do not remove the hex nut (Item 1) from the M20 screw of the generator vibration isolators.
6. Lift the generator until mounting feet brackets are high enough to insert a 1 3/4 inch steel spacer under both stator foot brackets.
7. Insert spacers and lower the generator so full weight rests on the mounting foot brackets.
8. Make sure no gap is present between skid and lower mount of rear engine vibration isolators.
9. Tighten the three screws to secure the bracket to the engine to 190-200 ft-lbs (260-270 N-m).
10. Lift the generator to remove the two 1 3/4 inch steel spacers.
11. Start the threads of the rear engine vibration isolator bolts (Item 2) before lowering.
12. Lower the generator and tighten the two rear engine vibration isolator bolts to 270-330 ft-lbs (365-447 N-m).
13. Secure the generator foot brackets to the vibration isolators and tighten to 270-330 ft-lbs (365-447 N-m).

Full service-parts list: Cummins/Onan DFE →

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.

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