VMAC
– Vehicle Mounted Air Compressors
Toll Free:
1-888-241-2289 Local: 250-740-3200
Fax: 1-250-740-3201
26
SYMPTOM
POSSIBLE CAUSE
CORRECTIVE ACTION
Frequent relief valve
operation
Pressure control line
plugged or frozen
Remove and clear the line
System still at high
pressure
Wait for system blow-down or
bleed off all system pressure
Defective relief valve
Replace the valve
Compressor does
not run
Solenoid valve open
Check solenoid valve operation
and replace if necessary
High oil temperature
See “frequent over-temperature
shut-
down”
Frozen solenoid valve
Temperatures below -10 C (14
F) can cause sticking, run the
engine to warm up the engine
compartment
Frequent over-
temperature shut-
down
Low oil level
Check oil level with equipment
on level ground
Restricted oil lines
Check for kinked or pinched
lines
Plugged oil filter
Replace oil filter
Cooler not functioning
or plugged
Replace or clean oil cooler
Engine cooling system
failure (high engine
temperature)
Correct problem
High ambient
temperatures
Reduce duty cycle
Oil temperature switch
failure
Replace if defective
Excessive oil in the
air discharge
Coalescing separator
failure
Replace element
Clogged scavenge line
screen
Clean or replace
High oil level
Check oil level with equipment
on level ground
Operating angle in
excess of 35 degrees
from horizontal
Reduce operating angle
Air operated
equipment is faulty, or
not correctly connected
to supply valve
Test air operated equipment for
proper operation and connect
to supply valve
Air use rate too high
Check min. pressure check
valve operation and replace if
necessary
Objectionable noise
level
Excessive gear wear
Replace gearbox assembly
