21
TROUBLESHOOTING
Problem
Possible Cause
Solution
Motor hums or runs slowly when first
turned on, but compressor does not
start.
Motor then stops humming.
- Fuses
blow
- Circuit breakers trip
- Motor thermal overload trips
Lubricant being used is too heavy.
Use a lighter weight lubricant (refer to
LUBRICATION).
Too many lights or appliances being
operated on the same circuit as the
compressor (circuit overloaded).
Try another circuit or remove other
appliances from circuit being used.
Defective check valve or unloader.
Replace check valve or unloader.
Freezing temperature.
Warm the compressor or use a lighter
weight lubricant (refer to
LUBRICATION
).
Motor sized incorrectly.
Replace with correctly sized motor.
Drive belt too tight.
Re-adjust belt (refer to
BELT
ALIGNMENT & ADJUSTMENT
).
Incorrect size fuse or circuit breaker.
Check for proper size fuse.
Lack of proper ventilation room
temperature too high.
Move the compressor to a well
ventilated area.
Compressor won’t operate.
Defective engine.
Replace or repair engine.
Lack of lubricant in compressor (can
cause serious damage to compressor).
Add lubricant (refer to
LUBRICATION
).
Belt too tight or too loose.
Adjust belt (refer to
BELT ALIGNMENT &
ADJUSTMENT
).
Noisy operation.
Lack of lubricant in crankcase.
Check for possible damage to
bearings. Add lubricant (refer to
LUBRICATION
).
Loose pulley, flywheel, belt,
compressor or motor fasteners,
beltguard, clamps or accessories.
Tighten where necessary.
Carbon deposits on piston or valves.
Remove the cylinder head and inspect
for foreign matter on top of the piston.
Clean.
Worn main bearings, broken piston,
worn wrist pins, wrist pin bearings, or
loose connecting rod bolt.
Take compressor to Service Center.
Excessive vibrations.
Pulley & flywheel misaligned or loose.
Re-align or tighten pulley and flywheel.
Bent crankshaft.
Take compressor to Service Center.
Belt loose.
Tighten belt (refer to
BELT ALIGNMENT
& ADJUSTMENT
).
Read and understand all the safety rules listed in this manual and follow all procedures listed in
MAINTENANCE
before
making repairs. Refer to the
gas engine owner’s manual
for troubleshooting the gas engine.
