Cummins/Onan — Inspecting Drive and Bearings
Maintenance · Generator drive belt and bearings
From a Cummins/Onan service manual — check it applies to your exact model before use.
Applies to: Cummins/Onan HDKB
Before you start
- Disconnect negative battery cable before removing panel.
Procedure
- Remove back panel to inspect drive and bearings.
- Pivot belt tensioner with 3/8 inch drive and remove belt.
- Examine belt; replace if in service 5 years or 2000 hours.
- Remove drive pulley and coupling; inspect split-sleeve bearings.
- Spin idler pulley; replace bearing if noisy.
- Spin generator pulley by hand; check for noise and looseness.
Tools required
- 3/8 inch drive Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Drive belt replacement interval 5 years or 2000 hours
- Coupling nuts 8 lb-ft (12 N-m)
- Hub-to-flywheel bolts 21 lb-ft (29 N-m)
Full service-parts list: Cummins/Onan HDKB →
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.