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TROUBLESHOOTING CHART (CONTINUED)
Symptom
Possible Cause(s)
Tank does not hold
Air leak in system
pressure when
compressor is
unloaded
Excessive belt wear
1. Pulley out of alignment
2. Belts too tight
3. Belts too loose
4. Pulley or flywheel wobble
5. Damage in belt groove of pulley or
flywheel
Excessive discharge
1. Dirty cooling surfaces
air temperature
2. Poor ventilation
3. Blown head gasket
4. Restricted air intake
5. Worn valves
Tank pressure builds
1. Dirty air filter
up slowly
2. Blown cylinder head gasket
3. Worn or broken intake or discharge valves 3. Install new valve plate assembly
4. Air leaks
5. Loose belts
6. Speed too slow
Tank pressure
1. Water in tank
builds up quickly on
2. Speed too fast
compressor
Compressor continues
1. Severe air leak in pilot unloader valve 1. Check all fittings and lines and replace those which leak
to build up pressure
2. Restriction in unloader lines
after unloading
pressure is reached
Engine stalls
Toggle lever on pilot unloader valve in
loaded position
Gasoline engine will
Defective unloader valve
not start
ASME safety valve
1. Defective
pops open while
2. Defective ASME safety valve
compressor is running
Corrective Action
Locate and repair leak
Never attempt to repair or modify a tank!
1. Realign motor pulley with compressor flywheel
2. Adjust tension. See "Maintenance" section
3. Adjust tension. See "Maintenance" section
4. Check for worn crankshaft, keyway or pulley bore, resulting from running
with loose pulleys. Check for bent crankshaft
5. File smooth or replace
1. Clean cooling surfaces of cylinder, intercooler and discharge tube
2. Improve ventilation or relocate compressor
3. Replace head gasket
4. Clean or replace air filter element
5. Replace valve plate assembly
1. Clean or replace filter element
2. Install new gasket
4. Tighten joints
5. Tighten belts. See "Maintenance" section
6. Check speed. See "Performance" chart
1. Drain tank. (This should be done DAILY)
2. Check speed. See specifications
2. Remove cause of restriction
Flip toggle level up into the unload position
Replace unloader valve
1. Replace unloader
2. Replace valve
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