Troubleshooting guide

18
PROBLEM
Knocking noise (cont'd)
Motor will not run.
CAUSE
Loose belt or 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.
CORRECTION
Adjust belt tension. Tension belt per in-
structions under "Belt Tension-Adjust-
ment" section of this manual.
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 using new gaskets and
torque bolts to 25-30 ft.-lbs.
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 a defective capacitor.
Return to Service Center for inspection
or replacement if necessary.
Have motor checked at a local Autho-
rized Warranty Service Center.
Motor will start automatically when tank
pressure drops below "cut-in" pressure
of pressure switch.
Remove and clean, or replace check
valve.
Check wiring connection inside pressure
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 time de-
layed 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 line by pushing "OFF/ON-AUTO"
lever on the pressure switch to the "OFF"
position and opening the pressure re-
lease 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.
TROUBLESHOOTING GUIDE (cont'd)