Climate Control Series
Quincy Compressor
2022209100, August 2018
32
Trouble
Probable Cause
Excessive Vibration
•Piping inadequately supported or tightened into a bind
(cont.)
•Excessive discharge pressure
•Compressor feet may need to be leveled with shims
Excessive drive belt wear
•Pulley/sheave out of alignment
•Belt too loose or too tight
•Belt slipping
•Pulley/sheave wobbling
•Pulley/sheave groove damaged or rough
•Incorrect belts
Low lubricant pressure
•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
Excessive air pressure
•Air pressure gauge inaccurate
in air receiver
•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
Excessive
•Intercooler restricted or plugged
intercooler pressure
•Compressor valves in second stage broken or not functioning properly
(Two stage models only)
•Pressure switch set incor rectly or defective
•Pressure gauge defective
Intercooler pressure
•Compressor valves or valve unloaders in first stage not functioning
abnormally low
properly or defective
(Two stage models only)
•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
