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 TABLE l-2. Troubleshooting Chart (Continued)
Possible Cause
Remedy
Problem
Excessive
Misalignment of belt pulleys
Realign as necessary.
or drive coupling.
vibration of
compressor
Bearings out of adjustment or
Adjust or replace
(continued)
excessively worn.
Cylinder, head, or intercooler
Outlet water
Clean compressor system
dirty.
parts.
temperature
above normal
Water quantity insufficient.
Increase cooling water
supply.
Compressor speed too high.
Slow down compressor.
Compressor
Discharge pressure above
Lower discharge pressure.
rating.
noisy or
knocks
Belts slipping.
Readjust belts.
V-belts or coupling misaligned.
Realign.
Pulley or flywheel loose.
Tighten pulley or flywheel
mountings.
Drive motor or compressor
Tighten mounting bolts.
mounting bolts loose.
Lubrication inadequate.
Increase oil level or
pressure.
Use correct oil viscosity.
Intercooler vibrating.
Check for loose mounting
hardware.
Operating cycle
Discharge pressure above
Readjust control.
lasts too long
rating.
Worn or broken internal
Replace worn or broken,
compressor parts.
parts.
Unloader or control device
Replace defective device
defective.
1-10
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