Vmac VR70 - Page 39

VMAC – Vehicle Mounted Air Compressors
Toll Free: 1-800-738-8622 Local: 1-250-740-3200
Fax: 1-250-740-3201
37
SYMPTON
POSSIBLE CAUSE
CORRECTIVE ACTION
Objectionable noise
level.
Excessive gear wear.
Contact the nearest dealer to
replace compressor/gearbox
assembly. Refer to the dealer.
Maximum RPM setting
higher than necessary
to meet air demand
requirements.
Reduce maximum RPM settings.
Operating with the
hood open
Close the hood.
Engine RPM stays at
base idle when
compressor runs.
Mechanical throttle
control receiving
power, housing is
acting as a chassis
ground.
Test and correct connections.
Throttle control not
adjusted properly.
Adjust throttle controls.
Poor electrical
connections.
Test and correct connections.
Throttle control not
functioning.
Replace throttle control.
Pressure sensor
defective or
disconnected.
Check connections or replace
pressure sensor.
Engine RPM over-
revs when
compressor is
activated.
Throttle controls not
connected properly.
Check and correct connections.
Throttle control not
setup properly.
Adjust high idle screw.
Pressure sensor
defective or
disconnected.
Check connections or replace
pressure sensor.
Engine RPM does
not return to base
idle.
Wiring fault.
Check and correct wiring
according to wiring diagram.
Throttle not properly
adjusted.
Adjust idle down screw.
Engine RPM stays at
maximum whenever
the compressor is
running.
Idle-down setting is too
high.
Reset idle-down pressure.