24
Class 4 Compressor Owner’s Manual
Problem
Compressor runs hot:
Compressor runs too slow:
Compressor hesitates or
stumbles at restart (115 PSI):
Note: Compressor kicks out
at 150 PSI and kicks back
in at 115 PSI
No lubricating oil pressure:
Possible Cause
Dirty intake filter.
Low oil Level.
Inline check-valve leaking.
Blown Head or Reed Valve Gasket.
Malfunctioning reed valve.
Speed control not working.
Check for air hose leaks.
Hydraulic system too hot.
Power unit relief set too low.
Hydraulic motor worn.
Hydraulic flow too low.
Malfunctioning reed valves.
Weak Hydraulic Pump.
Weak Hydraulic Motor.
No oil in crankcase.
Pump suction blocked.
Air lock in oil pump.
Oil pump pin is broken.
Malfunctioning oil pump.
Solution
Clean filter assembly.
Add oil if needed.
Disassemble, clean, and re-install.
Replace Gasket.
Inspect, clean or replace valves.
Check power supply and readjust.
Tighten any hose fitting leaking.
Reservoir too small. Add cooler to system.
Readjust relief valve.
Replace with new motor.
Check and reset flow.
Inspect, clean, or replace valves.
If the hydraulic pump pressure is below the
recommended GPM to the hydraulic motor, the
hydraulic pump could be weak and needs to be
replaced.
If the hydraulic pump is supplying the
recommended GPM to the hydraulic motor, the
hydraulic motor could be weak and needs to be
replaced.
Add oil.
Remove oil intake plug and inspect intake
screen. Clean blockage.
Loosen oil gauge while the compressor is
running. When oil begins to flow, tighten the
gauge.
Replace pin.
If the oil pressure gauge indicator is reading in
the red area, use a 1/4” lock washer and point it
flat. Remove the oil pump housing cover and
place the lock washer inside the oil pump
transfer bushing so it is between the pump spring
and the transfer bushing. If oil pressure is still low,
add one more lock washer. If two lock washers
don’t increase the oil pressure, replace the oil
pump.
