Industrial / Air Master Series
Quincy Compressor
50161-105, March 2008
35
3501 Wismann Lane, Quincy Ill. - 62305-3116
Trouble
Probable Cause
Intercooler pressure
•Compressor valves or head unloaders in first stage not functioning
abnormally low
properly or defective
(Two stage models only)
•Restricted air inlet filter or suction line
•Pilot valve or pressure switch set incorrectly or defective
•Pressurized air at head unloader not venting properly when demand for
air is required
•Compressor valve or head gasket leaking
•Worn piston rings
•Defective pressure gauge
•Leaking air at intercooler or intercooler connections
Compressor overheats
•Clogged intake system
•Defective compressor valves
•Pressure setting too high
•Clogged intercooler, internally or externally
•Inadequate ventilation, or recirculation of hot air
•Pulley/sheave rotation wrong
•Incorrect speed
•Running clearances insufficient
(piston to cylinder wall or running gear)
•Lubrication inadequate
•Compressor incorrectly sized
High discharge
•Compressor valve assemblies defective
temperature
•Discharge pressure too high
•Inadequate ventilation or hot air recirculating
•Cooling surfaces of compressor or intercooler excessively dirty
•Internal surface of heat exchanger fouled
•Ambient temperature too high
•Scored or excessively worn cylinder walls
Compressor knocks
•Head clearance insufficient
•Piston loose in cylinder bore, cylinder bore worn, piston or piston rings
worn
•Worn rods or main bearing
•Wrong pressure setting, discharge pressure excessive
•Crankcase lubrication inadequate
•Loose pulley/sheave
•Compressor valve assemblies loose
Summary of Contents for Air Master Series
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