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SYMPTOM
POSSIBLE CAUSE(S)
Excessive belt wear.
1. Pulley out of alignment
(Light dust from
2. Belts too tight or too loose
start is normal. Worn
belts separate at
layers)
Tank pressure builds
1. Dirty air filter
slowly
2. Blown cylinder head gasket
3. Worn/broken intake/discharge
valves
4. Air leaks
Tank pressure
Excessive water in tank
builds up quickly on
compressor
ASME safety valve
1. Pressure switch setting to high
pops open while
2. Malfunctioning ASME safety valve 2. Replace ASME safety valve
compressor is
3. Pressure switch contacts welded
running
Pressure switch
Malfunctioning check valve
continuously blows
air out the unloader
valve
Pressure switch
Malfunctioning unloader valve on
unloader valve does
pressure switch
not release air when
the unit shuts off
Interstage safety
1. Head gasket or the gasket in the
valve pops off while
valve plate assembly blown
the unit is running
2. Valve not seating properly
3. Malfunctioning safety valve
Interstage safety
Malfunctioning tank check valve
valve pops off after
the unit shuts off
CORRECTIVE ACTION
1. Realign motor pulley
2. Adjust tension
1. Clean or replace filter element
2. Install new gasket
3. Install new valve plate assembly
4. Tighten joints
Drain tank, check speed. See Performance table
1. Replace pressure switch
3. Replace pressure switch
Replace the check valve if the unloader valve bleeds off constantly
Replace the pressure switch if the unit does not hiss for a short period
of time when the unit shuts off
1. Replace valve plate and gaskets
2. Replace valve plate and gaskets
3. Replace safety valve
Replace the check valve
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