Cummins/Onan — Vibration Isolator Installation and Adjustment
Installation · mounting/isolators
From a Cummins/Onan service manual — check it applies to your exact model before use.
Applies to: Cummins/Onan DFGB, Cummins/Onan DFGE, Cummins/Onan DFLB, Cummins/Onan DFLC, Cummins/Onan DFLE, Cummins/Onan VTA28-G5 engine, Cummins/Onan KTA50 engine
Before you start
- Genset operation with shipping screws in place will damage control components
Procedure
- Place vibration isolators on genset support structure, shim/grout to within 0.25 in (6mm) elevation of each other
- Loosen side snubber lock nuts so top plate moves freely
- Place genset onto isolators aligning skid mounting with threaded isolator hole
- Adjust leveling bolts for 0.25 in (6mm) nominal clearance between top plate and isolator base
- Adjust leveling bolts until set is level with clearance roughly equal on all isolators, then lock
- Leave snubber nuts loose for better isolation
- Model DFCE only: remove the two controller cabinet shipping screws
Tools required
- wrench Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Nominal clearance 0.25 inch (6 mm) or greater between top plate and isolator base
Full service-parts list: Cummins/Onan DFGB →, Cummins/Onan DFGE →, Cummins/Onan DFLB →, Cummins/Onan DFLC →, Cummins/Onan DFLE →
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.