Cummins/Onan — Vibration Isolator Installation and Adjustment Procedure
Adjustments · Vibration isolators
From a Cummins/Onan service manual — check it applies to your exact model before use.
Applies to: Cummins/Onan GGHG, Cummins/Onan GGHH, Ford V-10 6.8L engine
Procedure
- Place vibration isolators on the generator set support structure; shim or grout so all isolator bases are within 0.25 inch (6 mm) elevation of each other.
- Loosen the side snubber lock nuts so the top plate is free to move vertically and horizontally; verify alignment with base and springs.
- Place the generator set onto the isolators while aligning the skid mounting with the threaded isolator hole.
- Adjust isolators with the leveling bolt to level the set; nominal clearance between top plate and base is 0.25 inch (6 mm) or greater.
- If radiator and engine/alternator are mounted on separate skids, make both skids level for proper fan belt alignment.
- If the set is not level, adjust leveling bolts until level with sufficient, roughly equal clearance on all isolators.
- Lock the leveling bolt in place with the lock nut.
- Leave snubber nuts loose to provide better isolation between the generator set and support structure.
Specs & values
- 0.25 inch (6 mm) nominal clearance
- Isolator base elevation within 0.25 inch (6 mm) of each other
Full service-parts list: Cummins/Onan GGHG →, Cummins/Onan GGHH →
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.