Troubleshooting - Quincy Compressor QR-25 Serie Manual De Instrucciones

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SECTION 6

Trouble

Low discharge pressure

Water in the crankcase

(lubricant appears milky)

Rusty valves

and/or cylin ders

Excessive vibration

QR-25 Series

52201-107, December 2012

Probable Cause

•Restricted inlet

•Defective compressor valves or valve unloading mechanism

•Leaks in the compressed air distribution system at fittings, connections,

etc.

•Unloader pilot defective or set wrong

•Pressure switch defective or set wrong

•Drive belt slipping

•Incorrect speed

•Worn piston rings or loose piston

•Faulty hydraulic unloader

•Leaking head gasket

•Low oil pressure

•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 alti tude it is operating at

•Piston rings not seated; allow 100 hours at full pressure

•Compressor does not run long enough to get hot and vaporize the liquids

squeezed out of the air during compression (compressor may be too large

for application)

•Incorrect or inferior grade of lubricant

•System pressure leaking back through dis charge valve

•Compressor operated too infrequently

•Compressor does not run long enough to get hot and vaporize the liquids

squeezed out of the air during compression (compressor may be too large

for application)

•Compressor not properly prepared for stor age

•Discharge line from compressor head is pointed upward allowing con

densation to drain back at shutdown

•Incorrect speed

•Compressor valves not functioning prop erly

•Loose pulley/sheave

•Motor or engine out of balance

•Compressor, motor or engine not secured tightly, or tightened into a

bind