Operation and maintenance manual

Troubleshooting Symptoms Charts QSB4.5 and QSB6.7
Page TS-8 Section TS - Troubleshooting Symptoms
Air Compressor Will Not Stop Pumping
Cause Correction
STEP 1
Air system leaks
.............
Block the vehicle wheels and check the air system
for leaks with spring brakes applied and released.
Check for leaks from the air compressor gaskets
and the air system hoses, fittings, tanks, and
valves. Refer to the OEM service manual.
OK
Go To Next Step
STEP 2
Contact a Cummins® Authorized Repair Facility