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NOTE
The belt should be centered over the grooves onthe
flywheel and motor pulley.
6. Push the motor back into regular position and
tighten bolts securely. Proper tension is approxi-
mately 1/4" belt deflection measured midway be-
tween 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 beltguardand screws.
Pulley and Flywheel - Alignment
The compressor flywheel and motor pulley must be
inline (in the same plane) within 1/16" to assure belt
retention within sheave grooves. The motor mounting
holes on the saddle are skewed to square the motor with
the compressor mounting hole as the belt is tensioned.
To check alignment, disconnect electrical power and
remove the belt guard. Place a straightedge 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.
TROUBLESHOOTING GUIDE
UNIT CYCLES AUTOMATICALLY WHEN POWER IS ()N. WHEN DOING MAINTENANCE, YOU MAY BE
EXPOSED TO VOLTAGE SOURCES, COM PRESSED AIR OR MOVING PARTS. PERSONAL INJURIES CAN
OCCUR. BEFORE PERFORMING MAINTENANCE OR REPAIR, TURN OFF AND LOCK OUT ELECTRIC
POWER AND BLEED OFF AIR TAN K PRESSURE. NEVER OPERATE TH ECOMPRESSOR WITH THE BELT
GUARD REMOVED.
PROBLEM CAUSE CORRECTION
Excessivetankpressure-safety Pressure switch does not shut off motor Pressureswitchmustbereplaced.
valve pops off. when compressor reaches "cut-out" pres-
sure.
Air leaks at fittings or hose. Tube or hose fittings are not tight enough.
Defective or dirty check valve.
Defective pressure switch release valve.
Defective air tank.
Air leaks at check valve.
Air leaks at pressure switch re-
leasevelve.
Air leaks at air tank welds.
Air leak from safety valve. Possible defect in safety valve.
Restricted check valve. *
Loose pulley.
Low oil level.
Loose flywheel.
Loose compressor bolts.
Loose belt.
Carbon build-up.
Tighten fittings where air can be heard escaping.
Check fittings under soapy water solution. DO NOT
OVER-TIGHTEN.
Removeand clean or replace check valve. DONOT
OVER-TIGHTEN.
Remove and replace the release valve.
Air tank must be replaced.
DO NOT DRILL INTO, WELD OR OTHER-
WISE MODIFY AIR TANK. IT WILL BE
WEAKENED.
Operate safety valve manually be pulling on dng. If
valve stillleaks, it should be replaced.
: Remove and clean or replace.
Tighten pulley set screw.
Maintain prescribed oil level
Tighten screw.
Check bolts. Tighten as required.
Tighten belt as per instructions under Belt Replace-
merit above.
Remove the head and valve plate. Clean the velve
plate and thetop of the piston. (Be surecarbon does
not fallintothe cylinder.) Reassemble to25-30 ft.lbs.
using new gasket and torque screws.
10- Eng