Troubleshooting Guide - Craftsman 919.175261 Owner's Manual

I
NOTE
The belt should be centered over the grooves
on the flywheel and motor pulley.
6. Push the motor back into regular position and
tighten bolts securely. Proper tension is approxi-
mately 114" belt deflection measured midway
between the pulley and flywheel when a 3 pound
weight or equivalent finger pressure is applied at
this point. A loose belt will squeal at compressor
start-up.
7. Replace beltguard and screws.
TROUBLESHOOTING GUIDE
PROBLEM
Excessivetank pressure-safety
valve pops off.
Pulley and Flywheel - Alignment
The compressor flywheel and motor pulley must be
inline (in the same plane) within 1tl 6" to assure belt
retention within sheave grooves. The motor mount-
ing holes on the saddle are skewed to square the
motor with the compressor mounting hole as the belt
is tensioned. To check alignment, disconnect electri-
cal power and remove the belt guard. Place a straight-
edge against the outside of the flywheel and measure
the distance from it to the nearest groove. Alignment
is achieved when the other end of the straightedge is
within 1/16" of the measured dimension at the pulley
grooves. Squareness is achieved when the pulley
grooves are an equal distance from the straightedge
on both sides of the motor shaft.
I
WARNING I
UNIT CYCLES AUTOMATICALLY WHEN POWER IS ON. WHEN DOING MAINTENANCE, YOU
MAY BE EXPOSED TO VOLTAGE SOURCES, COMPRESSED AIR OR MOVING PARTS.
PERSONAL INJURIES CAN OCCUR. BEFORE PERFORMING MAINTENANCE OR REPAIR, TURN
OFF AND LOCK OUT ELECTRIC POWER AND BLEED OFF AIR TANK PRESSURE. NEVER
OPERATE THE COMPRESSOR WITH THE BELT GUARD REMOVED.
CAUSE CORRECTION
Pressure switch does not shut off motor
when compressor reaches "cut-out" pres-
sure.
Air leaks at fittings or hose. Tubeorhosefittingsarenottightenough.
Air leaks at check valve. Defective or dirty check valve.
Air leaks at pressure switch Defective pressure switch release valve.
release valve.
Air leaks at air tank welds.
Air leak from safety valve.
Defective air tank.
Possible defect in safety valve.
Restricted check valve.
Loose pulley.
Low oil level.
Loose flywheel.
Loose compressor bolts.
Loose belt.
Carbon build-up.
10
Pressure switch must be replaced.
Tighten fittings where air can be heard escaping.
Check fittings under soapy water solution. DO
NOT OVER-TIGHTEN.
Removeand clean or replacecheckvalve. DO NOT
OVER-TIGHTEN.
Remove and replace the release valve.
Air tank must be replaced.
o,,,,.
WISE MODIFY AIR TANK. IT WILL BE
WEAKENED.
Operate safety valve manually be pullingon ring.
If valve still leaks, it shouldbe replaced.
Remove and clean or replace.
Tighten pulley set screw.
Maintain prescribedoil level.
Tighten screw.
Check bolts. Tighten as required,
Tighten belt as per instructions under Belt Re-
)lacement above.
Remove the head and valve plate. Cleanthe valve
)late and the top of the piston. (Be sure carbon
does not fall into the cylinder.) Reassemble to 25-
30 ftJbs, using new gasket and torque screws,