Cummins/Onan — Belt Replacement
Repair & overhaul · Drive belt
From a Cummins/Onan operator's manual — check it applies to your exact model before use.
Applies to: Cummins/Onan GGPA, Cummins/Onan GGPB, Cummins/Onan GGPC, General Motors GM 5.0 L engine
Before you start
- The belt idler is under tension. Do not allow your hands to get between the belt and pulley.
Procedure
- Slip in belt onto all pulleys except for the water pump/fan drive pulley.
- Insert the 3/8 inch male ratchet or breaker bar into tensioner arm.
- Rotate the ratchet counter clockwise until the spring tension on the belt is relieved sufficiently to position the belt over the water pump/fan drive pulley.
- Slowly release spring tension onto belt.
- Install fan guard.
- Connect the negative (-) cable to the battery.
- Start the generator set and visually check belt for proper alignment with the engine running.
Tools required
- 3/8 inch male ratchet or breaker bar Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Spring-loaded idler maintains the correct belt tension
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.