Owners Manual - Air Compressors Direct

TroubleIntercooler pressureabnormally low(Two stage models only)Probable Cause•Compressor valves or head unloaders in first stage not functioningproperly or defective•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 forair is required•Compressor valve or head gasket leaking•Worn piston rings•Defective pressure gauge•Leaking air at intercooler or intercooler connectionsCompressor 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 sizedHigh dischargetemperature•Compressor valve assemblies defective•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 wallsCompressor knocks•Head clearance insufficient•Piston loose in cylinder bore, cylinder bore worn, piston or piston ringsworn•Worn rods or main bearing•Wrong pressure setting, discharge pressure excessive•Crankcase lubrication inadequate•Loose pulley/sheave•Compressor valve assemblies looseQT & PLT SeriesQuincy Compressor50161-106, January 2009 36 3501 Wismann Lane, Quincy Ill. - 62305-3116