Craftsman 919.174212 Owner's Manual page 15

TROUBLESHOOTING GUIDE (Continued)
PROBLEM
Air Leaks
Restricted Air Intake
Squealing Sound
Low Discharge Pressure
Knocking
Excessive Belt Wear
CAUSE
Tube or hose fittings loose.
Defective check valve.
Leak at welds.
Air leak in safety valve.
Dirty air filter.
Belts too loose.
No oil in compressor.
Prolonged excessive use of air.
Restricted air intake filter.
Belt too loose.
Hole in hose.
Loose pulley.
Low oil level.
Flywheel loose.
Compressor bolts loose.
Loose belt.
Carbon build up.
Belt too loose.
Belt too tight.
Pulley wobble.
CORRECTION
Tighten fittings with audible leak and check
fittings under pressure with soapy water
solution. (Do not overtighten).
A defective check valve results in a constant
air leak at the pressure release valve
attached to the side of the pressure switch
(20) when there is pressure in the air tank
and the compressor is not running. Remove
and clean or replace check valve (do not
overtighten).
DO NOT DRILL mNTO,WELD OR
OTHERWISE MODIFY A_R TANK
OR TANK WILL BE WEAKENED,
TANK MUST BE REPLACED,
Operate safety valve manually by pulling on
ring. If valve still leaks, it should be replaced.
Clean or replace with new.
Tighten wing nut on motor mount.
Add oil to top of fill hole in base.
Decrease amount of air usage, compressor
is not large enough for air requirement. See
specification chart, page 5.
Clean or replace air intake filter.
Tighten wing nut on motor mount.
Check and replace if required.
Tighten pulley set screw.
Check oil level and maintain at prescribed
level.
Make sure flywheel is tight by tightening
screw.
Check all bolts and tighten as required.
Adjust wing nut on motor mount.
Remove head and valve plate. Clean top of
piston and bottom of valve plate. Reassem-
ble using new gasket and torque screws to
25-30 Ft.-Lbs.
Adjust tension using wing nut on motor
mount.
Adjust tension using wing nut on motor
mount.
Check for worn keyway or pulley bore result-
ing from running the compressor with loose
pulleys. Also check bent motor shaft.
15