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PROBLEM
Knocking (cont)
Excessive Oil Comsumption
Compressor Over heating
TROUBLESHOOTING CHART (Continued)
Flywheel loose.
Loose belt.
Restricted air intake.
Compressor overworked.
Poor quality or automotive
multiviscosity oil used.
Excessive engine or compressor
shaft end play.
Compressor overworked.
Check valve restricted.
Dirty compressor.
High ambient temperature.
Worn or carbonized valves.
Compressor too close to wall.
Air leaks in system.
Under sized unit for air require-
ment.
Unloader not operating.
Remote air intake pipe to small
or restricted.
Insufficient "OFF" time. Com-
pressor is running almost
continuously.
CAUSE
PAGE 18
CORRECTION
Make sure flywheel is tight by tight-
ening screw. Torque screw to
33-37 ft. lbs.
Tighten belt tension to deflect
1/4” with 8 lbs. applied to mid
span of belt.
Replace.
Reduce air consumption or add
additional air compressor to take
up load.
Drain pump and replace with new
oil. (Page 10)
Check pulley and/or flywheel for lat-
eral movements. Contact engine
manufacturer for repair, or DeVil-
biss if a compressor problem ex-
ists.
Reduce air consumption or add ad-
ditional air compressor to take up
load.
Clean.
Clean.
Use remote air intake.
Replace.
Relocate.
Check for source or leaks and cor-
rect.
Replace with a larger unit.
Replace.
Replace remote air intake pipping.
Compressor should not exceed
50% run time, which is maximum
30 min/hr. Check for source of
leaks and correct, or replace with
larger compressor.
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