TROUBLESHOOTING
PROBLEM CAUSE REMEDY
Loose compressor or motor
Tighten mounting bolts
Excessive discharge pressure
Reduce operating pressure
Compressor not level
Level compressor
Leg bolt tightened too tight
Loose leg bolts
Wrong oil being used
Drain and replace with proper oil
Loose flywheel, drive pulley, or drive
belt
Tighten parts and check belt
tension. Tighten belt if needed.
Excessive vibration
Worn rods, wrist pin, or main
bearings
Check and replace worn parts
Compressor valves loose or broken
Check and replace worn or
broken valves
Compressor knocks
Inspect check valve for low
pressure knock
Remove and clean check valve
Clogged inlet filter
Clean or replace filter
Wrong oil or viscosity being used
Drain and replace oil
Oil level too high
Drain oil to proper level
Crankcase breather valve
malfunction
Replace crankcase breather
valve
Compressor runs unloaded too long
Increase load or stop compressor
when not needed
Compressor operating in cold
conditions - inlet filter not protected
Provide protection against
extreme weather conditions
Worn piston rings
Replace piston rings
Compressor uses too much oil
Piston rings not seated
See below
Allow 100 hours of normal operation
for new rings to seat
Piston rings not seated
Drain oil and refill with approved
compressor oil
Pressure switch misadjusted
Have authorized service dealer
adjust pressure switch.
Safety relief valve pops open
Pressure switch inoperable
Have switch serviced by
authorized service dealer.
Air leaks from safety relief valve
Valve stuck or inoperable
Pull on ring and release.
Replace valve if leak continues.
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