Cummins/Onan 6CTA8.3 — Vibration Isolators Installation and Adjustment
Installation
For the Cummins/Onan 6CTA8.3, from the Cummins/Onan service manual.
Applies to: Cummins/Onan 6CTA8.3, Cummins/Onan DGBB, Cummins/Onan DGBC, Cummins/Onan DGCA, Cummins/Onan DGCB, Cummins/Onan DGCG, Cummins/Onan DGFA, Cummins/Onan DGFB, Cummins/Onan DGFC, Cummins/Onan 4B3.9 engine, Cummins/Onan 4BT3.9 engine, Cummins/Onan 4BTA3.9 engine
Procedure
- Place vibration isolators on genset support structure; shim/grout so isolator bases are within 0.25 in (6 mm) of each other and level.
- Loosen side snubber lock nuts so top plate moves freely; align top plate with base and springs.
- Place genset onto isolators, aligning skid mounting with threaded isolator hole.
- Adjust leveling bolt through skid into isolator; maintain 0.25 in (6 mm) or greater clearance between top plate and base.
- Adjust leveling bolts until set is level with roughly equal clearance on all isolators, then lock leveling bolt with lock nut.
- Leave snubber nuts loose for better isolation between genset and support structure.
Specs & values
- 0.25 inch (6 mm) nominal top plate clearance
Full service-parts list: Cummins/Onan DGBB →, Cummins/Onan DGBC →, Cummins/Onan DGCA →, Cummins/Onan DGCB →, Cummins/Onan DGFA →, Cummins/Onan DGFB →, Cummins/Onan DGFC →
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.