Quincy Compressor Industrial Series Instruction Manual page 40

Trouble
Excessive oil consumption •Compressor runs unloaded too long
Excessive current draw
(To determine maximum
amperage allowed, multiply
the FLA on the motor
nameplate by the service
factor.)
CAUTION !
Motor surface temperature •No crankshaft endplay
normally exceeds 170° F.
Failure to start
Motor stalls
Industrial / Air Master Series
50161-105, March 2008
Probable Cause
•Worn piston rings
•Restricted intake system
•Compressor running too hot
•Breather valve not functioning properly
•Oil level in crankcase too high
•Oil viscosity wrong for the application
•Connecting rod out of alignment, bent or twisted
•Leaking oil seal
•Piston rings not seated (allow 100 hours for seating)
•Wrong oil (may be a detergent oil with a tendency to foam)
•Inferior grade of oil
•Low voltage (must be within 10% of nameplate voltage)
•Loose electrical connection
•Wire size too small
•Incorrect oil
•Discharge pressure too high
•Intercooler plugging
•Bearings tight or seizing
•Motor sized incorrectly
•Motor defective
•Drive belts too tight
•Power not on
•Blown circuit fuse
•Thermal overload fuses tripped
•Low voltage
•Faulty start switch
•Power failure
•Pressure switch incorrectly adjusted or faulty
•Loose or broken wire
•Motor defective
•Compressor seized
•Motor overloaded (refer to Excessive current draw)
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Quincy Compressor
3501 Wismann Lane, Quincy Ill. - 62305-3116