Quincy Compressor QT Series Instruction Manual page 46

Trouble
Excessive oil consumption •Compressor runs unloaded too long
Excessive current draw
(To determine maximum
amper age 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
QT/QTS Series
2022208700, September 2018
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 name plate 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
•Overload relay 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)
44
CAUTION !
Overload relays are designed to pro-
tect the motor from damage due to
motor overload. If the overload relay
trips persistently, DO NOT CONTIN-
UE TO PUSH THE RESET BUTTON!
Contact your local Quincy distribu-
tor for assistance.
Quincy Compressor