Cummins/Onan 1B Series / 1B Series Plant — Oil pump priming
Maintenance · lubrication system
For the Cummins/Onan 1B Series / 1B Series Plant, from the Cummins/Onan operator's manual.
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Procedure
- If oil pump is removed, or one of oil lines disconnected, prime oil pump before operating plant.
- Fill oil pump body with oil.
- After properly filling crankcase with oil, insert screwdriver through valve inspection plate opening.
- Manually operate oil pump cam follower until increased pressure indicates oil pump is properly primed.
Tools required
- screwdriver Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
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.