Quincy Compressor QR-25 Series Instruction Manual page 35

Trouble
Excessive lubricant
consumption
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
QR-25 Series
52201-107, December 2012
Probable Cause
•Compressor runs unloaded too long
•Worn piston rings
•Restricted intake system
•Compressor running too hot
•Breather valve not functioning properly
•Lubricant level in crankcase too high
•Lubricant 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 lubricant (may be a detergent oil with a tendency to foam)
•Inferior grade of lubricant
•Low voltage (must be within 10% of name plate voltage)
•Loose electrical connection
•Wire size too small
•Incorrect lubricant
•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)
35
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.
3501 Wismann Lane, Quincy IL - 62305-3116
Quincy Compressor