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7 Problem solving
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
Worn piston rings or loose piston
Pressure relief valve leaking
Compressor incorrectly sized for the altitude it is operating at
Piston rings not seated; allow 100 hours at full pressure
(lubricant appears milky)
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
Incorrect or inferior grade of lubricant
System pressure leaking back through discharge valve
cylinders
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
Compressor not properly prepared for storage
Discharge line from compressor head is pointed upward allowing
condensation to drain back at shutdown
Compressor valves not functioning properly
Compressor, motor or engine not secured tightly, or tightened into a bind
Foundation or frame inadequate
Piping inadequately supported or tightened into a bind
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
Pulley/sheave groove damaged or rough
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