22
Class 4 Compressor Owner’s Manual
Troubleshooting
Problem
Compressor runs hot
Compressor does not run
Compressor runs too slow
Compressor will not stop
Air output too low
(air pressure okay)
Compressor cycles
(air not being used)
Air Output low
(Air Pressure Low)
Air pressure too low
Air pressure too high
High crankcase oil usage
Blowing oil from crankcase
breather
No lubricating oil pressure
Possible Cause
Check compressor rotation
Compressor reed valves
Dirty intake filter
Low oil Level
Check valve leaking
No 12 Volt Power to Compressor
Air reservoir full
Hydraulic lines not connected
Couplers or hoses blocked
Air load against compressor
Hydraulic pump not working
Hydraulic motor not working
Check valve leaking
Compressor reed valves
Check for hose leaks
Hydraulic flow too low
Hydraulic motor worn
Power unit relief set too low
Hydraulic system too hot
Speed control not working
Air pressure switch set wrong
Leaking hoses or fittings
Low compressor speed
Air filter dirty
Airlines leaking
Check valve plugged
Leaks in air line
Air pressure switch set wrong
Dirt in solenoid valve
Dirty air filter
Intake reed valves malfunction
Insufficient torque on head bolts
Air pressure switch set wrong
Air line leak
Air consumption exceeds
Compressor capacity
Intake or exhaust valves damaged
Pressure switch not operating
Internal contamination
Pressure switch not adjusted
Oil level too high
Oil leaks
Piston rings worn or broken
Blown head gasket
Piston rings worn or broken
Oil level in crankcase too high
Hole in piston
Air lock in oil pump
No oil in crankcase
Pump suction blocked
Solution
Check fittings on hydraulic motor
Inspect, clean or replace valves
Clean filter assembly
Level Add oil if needed
Disassemble, clean, and re-install
Check Fuse
Drain and activate pressure switch
Connect lines
Locate and remove restriction
Relieve air pressure
Check flow and pressure settings
Inspect and repair
Disassemble, clean, and reinstall or replace
Inspect, clean or replace valves
Tighten any hose fitting leaking
Check and reset flow
Replace with new motor
Readjust relief valve
Reservoir too small. Add cooler to system.
Check power supply and readjust
Check points and setting on switch
Tighten all fittings and hoses
Refer to compressor too slow
Clean or Replace Filters
Retighten hoses
Remove and clean check valve
Tighten hoses and fittings
Check cut-in and cutout settings
Remove and clean
Inspect and clean filter
If air back-flows from air filter, reed valve is faulty and
needs to be replaced.
Tighten bolts to required torque
Readjust high pressure setting
Inspect and tighten loose hoses
Check air demand for items using the air supply
Inspect and replace
Inspect and clean
Inspect and clean
Readjust to lower pressure
Check oil level and drain if needed
Inspect and repair gaskets or seals
Replace rings
Replace gasket
Replace rings
Check oil level and drain
Replace piston
Loosen oil gauge while compressor is running. When
oil begins to flow from fitting, tighten oil gauge.
Check oil level and add
Remove oil intake plug and inspect intake and screen.
Clean blockage.
General Troubleshooting
