RIDGID GP90150A Operator's Manual page 17

TROUBLE
Overheating
Excessive belt wear
Unit stalls
Excessive noise
(knocking)
PROBABLE CAUSE
1. Poor ventilation
2. Dirty cooling surfaces
1. Pulley out of alignment
2. Belt too loose or too tight
3. Belt slipping
4. Pulley wobbles
1. Low engine idle
2. Improper lubrication
3. Low oil level
4. Defective unloader valve
1. Loose engine or com-
pressor pulley
2. Lack of oil in crankcase
3. Worn connecting rod
4. Worn piston pin bushing
17
REMEDY
1. Relocate the compressor
to an area where an ample
supply of cool, clean, dry
and well-circulated air is
available
2. Clean the cooling surfaces
of pump and motor/engine
1. Realign engine pulley with
compressor pulley
2. Adjust tension (See Drive
Belt Section)
3. Adjust tension or replace
belt (See Drive Belt
Section)
4. Check for worn crankshaft,
keyway or pulley bore
resulting from running the
compressor or motor with
loose pulleys. Check for
bent pulleys or bent crank-
shaft
1. Increase idle, refer to
engine manual for details
2. See LUBRICATION, under
Assembly
3. Check oil level. Fill if nec-
essary
4. Replace
1. Loose engine or compres-
sor pulleys are a very com-
mon cause of compressors
knocking. Tighten pulley
clamp bolts and set-screws
2. Check for proper oil level; if
low, check for possible
damage to bearings. Dirty
oil can cause excessive
wear
3. Replace connecting rod
4. Remove piston assemblies
from the compressor and
inspect for excess wear.
Replace excessively worn
piston pin or pistons, as
required