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12
TROUBLESHOOTING GUIDE (CONT'D)
PROBLEM
Knocking noise
Motor will not run.
CAUSE
Restricted or defective check valve.
Loose pulley.
Low oil level.
Loose flywheel.
Loose compressor mounting screws.
Loose belt.
Belt too tight.
Carbon build-up.
Motor overload protection switch has
tripped.
Possible defective capacitor.
Possible defective motor.
Tank pressure exceeds pressure switch
"cut-in" pressure.
Check valve stuck open - fails to relieve
head pressure; motor cannot start.
Loose electrical connections.
Pressure release valve on pressure
switch has not unloaded head pressure.
Paint spray on internal motor parts.
Loose electrical connections.
Pressure release valve on pressure
switch has not unloaded head pressure.
Paint spray on internal motor parts.
CORRECTION
Remove and clean or replace.
Torque pulley set screw, see page 10.
Maintain prescribed oil level. Add oil.
Torque screw 15-20 ft. lbs.
Check screws. Torque as required (15-
20 ft.-lbs.)
Tighten wing nut until it contacts the
washer, plus one more turn.
Adjust belt tension (see "Belt Replace-
ment".)
Remove the head and valve plate. Clean
the valve plate and top of the piston. (Be
sure carbon does not fall into the cylin-
der.) Reassemble to 25-30 ft. lbs. using
new gasket and torque screws.
Let the motor cool off and reset switch
by pressing the red button located on
the end of the motor. If the overload still
trips, check for defective capacitor.
Return to Service Center for inspection
or replacement if necessary.
Have checked at a local Authorized
Warranty Service Center.
Motor will start automatically when tank
pressure drops below "cut-in" pressure
of pressure switch.
Remove and clean, or replace. DO NOT
OVER-TIGHTEN.
Check wiring connection inside pres-
sure switch and motor terminal box area.
1. Check fuse box for blown fuse and
replace if necessary. Reset circuit
breaker. Do not use a fuse or circuit
breaker with higher rating than that
specified for your particular branch
circuit.
2. Check for proper fuse; only Buss
"Fusetron"
Type T fuses are
acceptable.
3. Check for low voltage conditions.
4. Remove check valve and clean or
replace if it is stuck open or closed.
5. Disconnect any other electrical appli-
ances from circuit. The compressor
must operate on its own branch
circuit.
6. Do not use an extension cord.
Bleed
the line by pushing the lever on the
pressure switch to the OFF
position, opening the pressure
release valve. If the valve still
doesn't open, it must be replaced.
Have checked at an Authorized
Warranty Service Center. Do not
operate the compressor in the
spray area. See Flammable Vapor
Warning.