Industrial / Air Master Series Quincy Compressor
50161-105, March 2008 36 3501 Wismann Lane, Quincy Ill. - 62305-3116
Trouble Probable Cause
Excessive oil consumption •Compressor runs unloaded too long
•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
Excessive current draw •Low voltage (must be within 10% of nameplate voltage)
(To determine maximum •Loose electrical connection
amperage allowed, multiply •Wire size too small
the FLA on the motor •Incorrect oil
nameplate by the service •Discharge pressure too high
factor.) •Intercooler plugging
CAUTION ! •Bearings tight or seizing
Motor surface temperature •No crankshaft endplay
normally exceeds 170° F. •Motor sized incorrectly
•Motor defective
•Drive belts too tight
Failure to start •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 stalls •Motor overloaded (refer to Excessive current draw)
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