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VMAC
– Vehicle Mounted Air Compressors
VMAC Technical Support:
1-888-241-2289
VMAC Knowledge Base: www.kb.vmacair.com
58
SYMPTOM
POSSIBLE CAUSE
CORRECTIVE ACTION
Engine rpm does not
decrease.
Throttle tube frozen,
plugged or obstructed.
Clean or replace tube.
Throttle actuator failure.
Replace actuator.
Discharge valve failure.
Replace discharge valve.
Using large receiver tank.
See p. 68.
Inlet regulator pressure
set below unloader valve
pressure setting.
Follow the inlet regulator
adjusting steps on p. 68.
SYMPTOM
POSSIBLE CAUSE
CORRECTIVE ACTION
Engine rpm does not
increase.
Unloader valve manually
activated.
Manually disengage unloader
valve.
Inlet valve regulator
pressure set too low.
Adjust inlet valve regulator to
increase pressure.
Discharge valve failure.
Replace discharge valve. .
Throttle actuator failure.
Replace actuator.
SYMPTOM
POSSIBLE CAUSE
CORRECTIVE ACTION
Blowdown does not
function.
Scavenge tube frozen,
plugged or obstructed.
Clean or replace tube.
Blowdown muffler
plugged or obstructed.
Replace muffler.
Blowdown valve failure.
Replace blowdown valve
assembly.
SYMPTOM
POSSIBLE CAUSE
CORRECTIVE ACTION
Oil comes out of the
blowdown muffler.
Operating angle more
than 15° from horizontal.
Reduce operating angle.
Compressor oil overfilled.
Check oil level with equipment on
level ground.
Faulty blowdown shuttle
valve.
Replace blowdown shuttle valve.
Blowdown valve failure.
Replace blowdown valve
assembly.
SYMPTOM
POSSIBLE CAUSE
CORRECTIVE ACTION
Engine overheat.
High ambient
temperatures.
Reduce duty cycle.
Low engine oil level.
Check engine oil level with
equipment on level ground.
Cooling intake plugged.
Correct problem.
Insufficient ventilation.
Correct problem.
Spark arrester fouled.
Clean spark arrester.
Mounted in enclosure.
See enclosure mounting
parameters on p. 21.
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