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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 approximately 1/4"
belt deflection measured midway between the pul-
ley and flywheel when a 3 pound weight or equiva-
lent finger pressure is applied at this point. A loose
belt will squeal at compressor start-up.
7.
Replace beltguard and 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 com-
pressor 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 straight-
edge on both sides of the motor shaft.
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.
PROBLEM
Excessive tank pressure- safety
valve pops off.
CAUSE
CORRECTION
Pressure switch must be replaced.
Pressure sw!tch does not shut off motor
when compressor reaches "cut-out" pres-
sure.
Air leaks at fittings or hose.
Tube or hose fittings are not tight enough.
Tighten fittings where air can be heard escaping,
Check fittings under soapy water solution. DO NOT
OVER-TIGHTEN.
Air leaks at check valve.
Defective or dirty check valve.
Remove and clean or replace check valve. DO NOT
OVER-TIGHTEN.
Air leaks st pressure switch re-
Dsfectivepressureswitch
releasevalve.
Removeand replaoetherelsasevalve.
lease valve.
Air leaks at air tank welds.
Defective air tank.
Air tank must be replaced.
iP'_W_d_] _1_
Air leak from safety valve.
Possible defect in safety valve.
Restricted checkvalve.
Loose pulley.
Low oil level.
Loose flywheel.
Loose compressor bolts.
Loose belt.
Carbon
build-up.
DO NOT DRILL INTO, WELD OR
OTHERWISE
MODIFY AIR TANK. IT
WILL BE WEAKENED.
Operate safety valve manually be pulling on ring. If
valve still leaks, 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-
ment above.
Remove the head and valve plate. Clean the valve
_lateand the top of the piston. (Be sure carbon does
not fall into t he cylinder.) Reassemble to 25-30 ft.lbs.
using new gasket and torque screws.
11 -- Eng
D20410
Rev 0 2116/00
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