Owners Manual - Air Compressors Direct

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SECTION 6TROUBLESHOOTINGTroubleLow discharge pressureProbable Cause•Restricted inlet•Defective compressor valves or valve unloading mechanism•Leaks in the compressed air distribution system at fittings, connections,etc.•Unloader pilot valve defective or set wrong•Pressure switch defective or set wrong•Drive belt slipping•Incorrect speed•Worn piston rings or loose piston•Leaking head gasket•Drain valve open•Defective pressure gauge•Excessive running clearances (refer to SECTION 2, Specifications)•Pressure relief valve leaking•Clogged intercooler•Loose compressor valves or leaking at valve gaskets•Compressor incorrectly sized for the altitude it is operating at•Piston rings not seated; allow 100 hours at full pressureWater in the crankcase(lubricant appears milky)•Compressor does not run long enough to get hot and vaporize the liquidssqueezed out of the air during compression (compressor may be too largefor application)•Incorrect or inferior grade of lubricant•System pressure leaking back through discharge valveRusty valvesand/or cylinders•Compressor operated too infrequently•Compressor does not run long enough to get hot and vaporize the liquidssqueezed out of the air during compression (compressor may be too largefor application)•Compressor not properly prepared for storage•Discharge line from compressor head is pointed upward allowing condensation to drain back at shutdownExcessive vibration•Incorrect speed•Compressor valves not functioning properly•Loose pulley/sheave•Motor or engine out of balance•Compressor, motor or engine not secured tightly, or tightened into abind•Foundation or frame inadequate•Piping inadequately supported or tightened into a bind•Excessive discharge pressure•Compressor feet may need to be leveled with shimsQT & PLT SeriesQuincy Compressor50161-106, January 2009 34 3501 Wismann Lane, Quincy Ill. - 62305-3116
TroubleExcessive drive belt wearProbable Cause•Pulley/sheave out of alignment•Belt too loose or too tight•Belt slipping•Pulley/sheave wobbling•Pulley/sheave groove damaged or rough•Incorrect beltsLow oil pressure•Oil sump strainer plugged•Excessive leakage at crankshaft seals•Low oil level•Oil pump incorrectly assembled to the bearing carrier (“o”ring notproperly located between oil pump body & bearing carrier)•Oil pressure adjusting screw not set properly•Defective oil pressure gaugeCompressor loadsand unloads excessively•<strong>Air</strong> receiver too small•Compressor valves or unloaders defective•Excessive system leakage•Compressor operating at incorrect speed•Unloader pilot differential set too close•Pressure switch defectiveDefective pressure switch•Moisture &/or oil buildup on the pressure switch diaphragm•Ruptured diaphragm•Burned contact points•Plugged air passage from the receiver to the pressure switch•Loose electrical connectionExcessive air pressurein air receiver•<strong>Air</strong> pressure gauge inaccurate•Leaks in unloader piping system•Defective compressor head unloader•Pilot valve or pressure switch set incorrectly or defective•Pressure switch wired incorrectly•Tube to compressor head unloader pluggedExcessiveintercooler pressure(Two stage models only)•Intercooler restricted or plugged•Compressor valves in second stage broken or not functioning properly•Pilot valve or pressure switch set incorrectly or defective•Pressure gauge defectiveQT & PLT SeriesQuincy Compressor50161-106, January 2009 35 3501 Wismann Lane, Quincy Ill. - 62305-3116
Page 1 and 2: QT ® & PLT ® Series2 Stage Compre
Page 3 and 4: Warranty StatementTrue Blue Warrant
Page 5 and 6: SECTION 1SAFETYSafety FirstAt Quinc
Page 7 and 8: The owner, lessor or operator of an
Page 9 and 10: enclosure, across the motor, compre
Page 11 and 12: Retain all containers and packing f
Page 13 and 14: Fig. 3-13 Phase Magnetic Motor Star
Page 15 and 16: Fig. 3-3Single Phase 5 hp-230V Econ
Page 17 and 18: Connect incomingpower lines at scre
Page 19 and 20: Fig. 3-7Start / Stop ControlPiping
Page 21 and 22: Fig. 3-9Dual Control with Pilot Val
Page 23 and 24: WARNING !Excessive compressor RPM
Page 25 and 26: where moisture can be easily remove
Page 27 and 28: WARNING !Oil and moisture residue m
Page 29 and 30: Step 12)Step 13)(Xtreme Units)-Make
Page 31 and 32: SECTION 5MAINTENANCE & LUBRICATIONS
Page 33 and 34: LubricationQT and PLT Series basic
Page 35 and 36: POCKET CLIPSLIDINGRUBBER O-RINGSDEF
Page 37: PILOT VALVE ADJUSTMENTSAll adjustme
Page 41 and 42: TroubleProbable CauseExcessive oil
Page 43 and 44: Typical QT & PLT Series Unit with V
Page 45 and 46: QT & PLT SeriesQUINCY COMPRESSORSTA
Page 48: Reciprocating / Systems: 217.222.77

Owners Manual - Air Compressors Direct

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