Cummins/Onan 1750DQKB / 3200 Series — Generator Mount Pre-Load Adjustment
Adjustments · Generator mount / vibration isolators
For the Cummins/Onan 1750DQKB / 3200 Series, from the Cummins/Onan service manual.
Applies to: Cummins/Onan 1750DQKB, Cummins/Onan DFE
Before you start
- Accidental starting of the generator set during this procedure presents the hazard of severe personal injury or death.
Procedure
- Turn off and disconnect battery charger (if equipped).
- Disconnect the negative (-) battery cable(s) to prevent accidental starting.
- Unscrew bolt (Item 2) from skid but do not remove it from either rear engine vibration isolator.
- Loosen the three screws that secure the engine mount brackets to the engine.
- Loosen but do not remove the hex nut (Item 1) from the M20 screw of the generator vibration isolators.
- Lift the generator until the mounting feet brackets are high enough to insert a 1 3/4 inch steel spacer under both stator foot brackets.
- Insert spacers and lower the generator so the full weight rests on the mounting foot brackets.
- Make sure no gap is present between the skid and the lower mount of the rear engine vibration isolators; tighten the three screws to 190-200 ft-lbs.
- Lift the generator to remove the two 1 3/4 inch steel spacers.
- Before lowering, start the threads of the rear engine vibration isolator bolts (Item 2).
- Lower the generator and tighten the two rear engine vibration isolator bolts to 270-330 ft-lbs.
- Secure the generator foot brackets to the vibration isolators; tighten the fastener to 270-330 ft-lbs.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- engine mount bracket screws: 190-200 ft-lbs (260-270 FridayParts $22.00 N-m)
- rear engine vibration isolator bolts: 270-330 ft-lbs (365-447 N-m)
- generator foot bracket fastener: 270-330 ft-lbs (365-447 N-m)
Full service-parts list: Cummins/Onan 1750DQKB →, 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.