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PROBLEM
POSSIBLE CAUSE
Lubricant viscosity too low.
Lubricant level too low.
Detergent type lubricant being used.
Abnormal piston, ring
Cylinder(s) or piston(s) scratched, worn or
or cylinder wear
scored.
Extremely dusty atmosphere.
Worn cylinder finish.
Clogged or dirty inlet and/or discharge line filter. Clean or replace.
Air leaks in air discharge piping.
Lubricant viscosity too high.
Compressor valves leaky, broken, carbonized or
loose.
Piston rings damaged or worn (broken, rough or
Air delivery drops off
scratched). Excessive end gap or side clearance.
Piston rings not seated, are stuck in grooves or
end gaps not staggered.
Cylinder(s) or piston(s) scratched, worn or
scored.
Defective safety/relief valve.
Loose beltwheel or motor pulley, excessive end
play in motor shaft or loose drive belts.
Lubricant viscosity too high.
Unit does not come up
Improper line voltage.
to speed
Compressor valves leaky, broken, carbonized or
loose.
Defective ball bearings on crankshaft or motor
shaft.
Lubricant viscosity too high.
Leaking check valve or check valve seat blown
out.
Unit is slow to come up
to speed
Ambient temperature too low.
Bad motor.
Inadequate ventilation around beltwheel.
Drive belts too tight or misaligned.
Unit runs excessively
Compressor valves leaky, broken, carbonized or
hot
loose.
Wrong beltwheel direction of rotation.
Loose beltwheel or motor pulley, excessive end
play in motor shaft or loose drive belts.
Lubricant viscosity too high.
Lubricant level too low.
Compressor valves leaky, broken, carbonized or
Excessive noise during
loose.
operation
Carbon build-up on top of piston(s).
Defective ball bearings on crankshaft or motor
shaft.
Leaking check valve or check valve seat blown
out.
80444425 Rev. D
TROUBLESHOOTING
POSSIBLE SOLUTION
Drain existing lubricant and refill with proper lubricant.
Add lubricant to crankcase to proper level.
Drain existing lubricant and refill with proper lubricant.
Repair or replace as required.
Install remote air inlet piping and route to source of cleaner
air. Install more effective filtration.
Deglaze cylinder with 180 grit flex-hone.
Check tubing and connections.
Drain existing lubricant and refill with proper lubricant.
Inspect valves. Clean or replace as required. Install valve kit.
Install ring kit.
Adjust piston rings.
Repair or replace as required.
Replace.
Check beltwheel, motor pulley, crankshaft, drive belt tension
and alignment. Repair or replace as required.
Drain existing lubricant and refill with proper lubricant.
Check line voltage and upgrade lines as required. Contact
electrician.
Inspect valves. Clean or replace as required. Install valve kit.
Inspect bearings and replace crankshaft assembly if
required.
Drain existing lubricant and refill with proper lubricant.
Replace check valve.
Relocate unit to warmer environment. Install crankcase
heater kit.
Replace.
Relocate unit for better air flow.
Adjust belts to proper tension and alignment.
Inspect valves. Clean or replace as required. Install valve kit.
Check motor wiring for proper connections. Reverse two
leads on three-phase motors.
Check beltwheel, motor pulley, crankshaft, drive belt tension
and alignment. Repair or replace as required.
Drain existing lubricant and refill with proper lubricant.
Add lubricant to crankcase to proper level.
Inspect valves. Clean or replace as required. Install valve kit.
Clean piston(s). Repair or replace as required.
Inspect bearings and replace crankshaft assembly if
required.
Replace check valve.
EN
EN-9
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