VMAC
– Vehicle Mounted Air Compressors
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56
SYMPTOM
POSSIBLE CAUSE
CORRECTIVE ACTION
Compressor building
above set pressure
(Verified by pressure
gauge) or pressure relief
valve venting at 200 psi.
Pressure control tube
plugged or frozen.
Remove and clear the tube.
Defective inlet or
poppet O-ring.
Replace O-ring.
Defective inlet valve.
Replace inlet assembly.
Plugged or restricted
pressure control tube.
Replace components as needed.
Unloader valve out of
adjustment or failed.
Replace unloader valve.
SYMPTOM
POSSIBLE CAUSE
CORRECTIVE ACTION
Compressor will not build
to set pressure
(Verified by pressure
gauge).
Defective
downstream
equipment (Filter
Regulator Lubricator,
fittings, hose reel.
Replace as required with suitable
components.
Unloader valve
manually activated.
Manually disengage unloader
valve.
Excessive leakage
through blowdown
muffler.
Replace blowdown shuttle valve.
Plugged or dirty
compressor air filter.
Replace air filter.
Drive belt slipping.
Check belt.
Leaks in air lines.
Replace components as needed.
Pressure relief valve
leaking.
Replace pressure relief valve.
Inlet valve regulator
set too low.
Adjust inlet valve regulator.
See p. 68.
SYMPTOM
POSSIBLE CAUSE
CORRECTIVE ACTION
Engine Stalls.
Low fuel in engine.
Add fuel to engine.
Compressor pressure
set too high.
Lower compressor air pressure to
approx. 150 psi.
Ensure unloader activates (rpm
decreases).
Starting compressor
under pressure.
Ensure system is depressurizing
on shut down.
Operating at too high
of an elevation.
See section on elevation on p. 14.
Low engine oil.
Add oil to engine.
Spark plug gap.
Replace spark plug.
Spark arrester
clogged.
Clean or replace the spark
arrester.
Mounted in enclosure.
See enclosure mounting
parameters on p. 21.
Summary of Contents for G300003
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