Cummins/Onan — Generator support alignment to skid base
Installation · generator mounting
From a Cummins/Onan operator's manual covering: 500 DFX-57R, 600 DFX-4R, 600 DFX-4XR, DFX 4R, DFX 4XR, DFX 57R, DFX 5DR, DFX 6DR, DFX 7XR, DFX 9XR. Check it applies to your exact model before use.
Applies to: Cummins/Onan 500 DFX-57R, Cummins/Onan 600 DFX-4R, Cummins/Onan 600 DFX-4XR, Cummins/Onan KT2300-G engine
Before you start
- Generator support must be aligned to prevent premature bearing failure, vibration, drive disc failure
Procedure
- Set unit on mounting foundation with vibration isolators between skid base and foundation
- Secure skid base to isolators and isolators to foundation
- Remove two mounting bolts and use as jackscrews
- Raise generator and remove shims from between generator and support and skid base
- Adjust jackscrew tension and allow generator to hang free
- Measure clearance from skid base top to each generator support surface with feeler gauge
- Add 0.010 in (0.254mm) to each side to determine shim amount
- Turn jackscrews to allow clearance for placing shims
- Lower generator onto shims using jackscrews
- Recheck total clearance equals base-to-support clearance plus 0.010 in
- Remove jackscrews and reinstall as mounting bolts through support, shims, and skid base
- Secure and lock mounting bolts in place
Tools required
- feeler gauge Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- 0.010 inches (0.254 mm) added clearance
Full service-parts list: Cummins/Onan 500 DFX-57R →, Cummins/Onan 600 DFX-4R →, Cummins/Onan 600 DFX-4XR →
Source: Cummins/Onan operator's 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.