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# VACUUM PUMP (for KD Series Engine) > INSPECTION

## for Preparation Click here

1. CHECK OPERATION OF CHECK VALVE SUB-ASSEMBLY

1. Check that air flows from the hose side to the pump side.

1. Check that air does not flow from the pump side to the hose side.
   If necessary, replace the check valve sub-assembly.

2. CHECK VACUUM PUMP HOUSING

1. Check the inside surface of the housing for scoring.
   If necessary, replace the vacuum pump assembly.