Quincy Compressor Climate Control Series Instruction Manual page 34

Trouble
Excessive Vibration
(cont.)
Excessive drive belt wear
Low lubricant pressure
Excessive air pressure
in air receiver
Excessive
intercooler pressure
(Two stage models only)
Intercooler pressure
abnormally low
(Two stage models only)
Climate Control Series
2022209100, August 2018
Probable Cause
•Piping inadequately supported or tightened into a bind
•Excessive discharge pressure
•Compressor feet may need to be leveled with shims
•Pulley/sheave out of alignment
•Belt too loose or too tight
•Belt slipping
•Pulley/sheave wobbling
•Pulley/sheave groove damaged or rough
•Incorrect belts
•Oil pump direction reversed
•Oil sump strainer plugged
•Excessive leakage at crankshaft seals
•Low lubricant level
•Oil pump incorrectly assembled to the bear ing carrier ("o"ring not
properly located between oil pump body & bearing carrier)
•Lubricant pressure adjusting screw not set properly
•Defective oil pressure gauge
•Plugged oil filter
•Air pressure gauge inaccurate
•Leaks in unloader piping system
•Defective compressor valve unloader
•Pressure switch set incor rectly or defective
•Pressure switch wired incorrectly
•Tube to compressor unloader valve plugged
•Intercooler restricted or plugged
•Compressor valves in second stage broken or not functioning properly
•Pressure switch set incor rectly or defective
•Pressure gauge defective
•Compressor valves or valve unloaders in first stage not functioning
properly or defective
•Restricted air inlet filter or suction line
•Pressure switch set incor rectly or defective
•Pressurized air at valve unloader not vent ing properly when demand for
air is re quired; vent passage at hydraulic unloader could be plugged
•Compressor valve or head gasket leaking
•Worn piston rings
•Defective pressure gauge
•Leaking air at intercooler or intercooler connections
32
Quincy Compressor