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15
Symptom
Possible Cause(s)
Corrective Action
Excessive belt wear.
(Light dust from start
is normal. Worn belts
separate at layers)
1. Pulley out of alignment
1. Realign motor pulley
2. Belts too tight or too loose
2. Adjust tension
Tank pressure builds
slowly
1. Dirty air filter
1. Clean or replace filter element
2. Blown cylinder head gasket
2. Install new gasket
3. Worn/broken intake/discharge valves 3. Install new valve plate assembly
4. Air leaks
4. Tighten joints
Tank pressure
builds up quickly on
compressor
Excessive water in tank
Drain tank, check speed. See Performance table
ASME safety valve
pops open while
compressor is running
1. Pressure switch setting to high
1. Replace pressure switch
2. Malfunctioning ASME safety valve
2. Replace ASME safety valve
3. Pressure switch contacts welded
3. Replace pressure switch
Pressure switch
continuously blows air
out the unloader valve
Malfunctioning check valve
Replace the check valve if the unloader valve bleeds off constantly
Pressure switch
unloader valve does
not release air when
the unit shuts off
Malfunctioning unloader valve on
pressure switch
Replace the pressure switch if the unit does not hiss for a short period
of time when the unit shuts off
Interstage safety valve
pops off while the unit
is running
1. Head gasket or the gasket in the
valve plate assembly blown
1. Replace valve plate and gaskets
2. Valve not seating properly
2. Replace valve plate and gaskets
3. Malfunctioning safety valve
3. Replace safety valve
Interstage safety valve
pops off after the unit
shuts off
Malfunctioning tank check valve
Replace the check valve
MAINTENANCE
/
REP
AIR
TROUBLESHOOTING
OPERA
TION
ASSEMBL
Y
/
INST
ALLA
TION
SAFETY
/
SPECIFICA
TIONS
GETTING ST
ARTED