Operating Instructions
Troubleshooting Guide (Continued)
SyMptoM
CauSe
Solution
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12
Insufficient pressure at
point of use
1� Leaks or restriction
2. Restricted air intake
3� Slipping belts
4� Service hose or pipe too
small
5. Excessive air requirement
6. Broken valve
1. Check for leaks or restriction in hose or piping. Repair or replace.
2� Clean or replace air filter element�
3� Tighten belts, See “Maintenance” section�
4. Replace with larger hose or pipe.
5� Limit air usage to compressor capacity by using fewer or smaller
tools�
6. Replace reed valve assembly.
Tank does not hold
pressure when
compressor is unloaded
Air leak in system
Locate and repair leak�
Never attempt to repair or modify a tank
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
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.
Excessive discharge air
temperature
1� Dirty cooling surfaces
2. Poor ventilation
3. Blown head gasket
4. Restricted air intake
5� Worn valves
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.
Tank pressure builds up
slowly
1� Dirty air filter
2. Blown cylinder head
gasket
3� Worn or broken intake or
discharge valves
4. Air leaks
5� Loose belts
6� Speed too slow
1� Clean or replace filter element�
2� Install new gasket�
3� Install new valve plate assembly
4� Tighten joints
5� Tighten belts� See “Maintenance” section
6. Check speed. See “Performance” chart
Tank pressure builds up
quickly on compressor
1� Water in tank
2� Speed too fast
1. Drain tank. (This should be done DAILY).
2� Check speed� See specifications in replacement parts list�
Compressor continues
to build up pressure
after unloading pressure
is reached
1� Severe air leak in pilot
unloader valve
2. Restriction in unloader
lines
1� Check all fittings and lines and replace those which leak�
2. Remove cause of restriction.
Engine stalls
Toggle lever on pilot
unloader valve in loaded
position
Flip toggle level up into the unload position.
Gasoline engine will not
start
Low engine oil� Some
engines equipped with low-
oil shutdown
Add oil to proper level.
ASME safety valve pops
open while compressor
is running
1� Wrong unloader valve
setting
2. Defective ASME safety
valve
1. Adjust to lower pressure (175 maximum psi for two-stage unit or
125 psi for single stage unit)� See Operation section�
2. Replace valve.
