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PROBLEM
Abnormal piston, ring or cylinder wear��
Air delivery drops off
Unit does not come up to speed
Unit is slow to come up to speed
Unit runs excessively hot
EN-12
RELEASED 31/Jan/2020 19:25:50 GMT
TROUBLESHOOTING
POSSIBLE CAUSE
Lubricant viscosity too low
Lubricant level too low
Detergent type lubricant being used
Cylinder(s) or piston(s) scratched worn or
scored��
Extremely dusty atmosphere��
Worn cylinder finish
Clogged or dirty inlet and / or discharge line
filter
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 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
Improper line voltage
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��
Ambient temperature too low��
Bad motor��
Inadequate ventilation around beltwheel��
Drive belts too tight or misaligned
Compressor valves leaky, broken, carbonized
or loose
Wrong beltwheel direction of rotation
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��
Clean or replace
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��
22204945 Rev D
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