50
14K160TH OTR Body & Air Compressor Manual # 99903184
PROBLEM
CAUSE
RESOLUTION
Restricted compressor inlet air
filter.
Replace filter.
Faulty control system operation.
Check regulator signal. Repair
system if needed.
High Discharge Pressure
(Indicated if the safety valve
blows or the system shuts down
on high pressure)
Faulty discharge pressure
gauge.
Replace pressure gauge.
Coalescer plugged.
Clean coalescer.
Faulty safety valve.
Replace safety valve.
No regulator air pressure signal
to inlet valve.
Check signal, and replace faulty
components.
Sump Relief Valve Activates
Inlet valve leaks or is open.
Repair or replace valve.
Faulty regulator.
Repair or replace regulator.
Sump Pressure Does Not Blow
Down
Inoperative automatic blow
down valve at coalescer head.
Replace valve
Blockage.
Check air line from side of inlet
valve to blow down valve.
Clogged muffler.
Check / clean muffler.
Oil Consumption
Excess oil consumption, or oil in
service line.
Check overfilling of oil sump.
Repair leaking oil lines or oil cooler.
Inspect oil line to the compressor.
Open plugged oil return line if
needed.
Replace coalescer element if
defective.
Repair leaks in compressor shaft
seal.
Check discharge pressure.
Pressure should be between 65 PSI
and 150 PSI.
Engine Will Not Accelerate or
Maintain Full Load Speed
Engine problem.
Refer to engine manual.
High compressor discharge
pressure.
Reduce discharge pressure
Compressor running at truck
idle. (Improper speed)
Correct speed
Operating above maximum
altitude rating of compressor
and truck.
Move to lower altitude
