Troubleshooting

!WARNING

For your own safety do not try and run the air compressor while troubleshooting.

TROUBLE

PROBABLE CAUSE

 

REMEDY

 

 

 

 

 

 

 

 

 

 

Low discharge pres-

1. Air leaks

1. Listen for escaping air.

sure

 

 

Apply soap solution to all

 

 

 

fittings and connections.

 

 

 

Bubbles will appear at

 

 

 

points of leakage. Tighten

 

 

 

or replace leaking fittings

 

 

 

or connections

 

2. Leaking valves

2. Remove head and inspect

 

 

 

for valve breakage, weak

 

 

 

valves, scored valve seats,

 

 

 

etc. Replace defective

 

 

 

parts and reassemble

 

 

 

 

 

 

 

 

! CAUTION

 

 

 

Be sure that the old head

 

 

gasket is replaced with a

 

 

new one each time the

 

 

head is removed

 

3. Restricted air intake

3. Clean the air filter element

 

4. Slipping belts

4. Loosen engine clamping

 

 

 

bolts and move the engine

 

 

 

in a direction away from

 

 

 

the compressor, being sure

 

 

 

that the engine pulley is

 

 

 

perfectly aligned with the

 

 

 

flywheel. Tighten engine

 

 

 

clamping bolts. The belt

 

 

 

should deflect about 1/2”

 

 

 

under 5-lbs of force. Do

 

 

 

not “roll” belts over pulleys

 

5. Blown gaskets

5. Replace any gaskets

 

 

 

proven faulty on inspection

 

6. Low compression

6. Low pressure can be due

 

 

 

to worn rings and cylinder

 

 

 

walls. Correction is made

 

 

 

by replacing the rings,

 

 

 

cylinders, and pistons as

 

 

 

required

 

 

 

 

 

TROUBLE

PROBABLE CAUSE

REMEDY

 

 

 

 

 

 

Overheating

1. Poor ventilation

1. Relocate the compressor

 

 

to an area where an ample

 

 

supply of cool, clean, dry

 

 

and well-circulated air is

 

 

available

 

2. Dirty cooling surfaces

2. Clean the cooling surfaces

 

 

of pump and motor/engine

 

 

 

Excessive belt wear

1. Pulley out of alignment

1. Realign engine pulley with

 

 

compressor pulley

 

2. Belt too loose or too tight

2. Adjust tension (See Drive

 

 

Belt Section)

 

3. Belt slipping

3. Adjust tension or replace

 

 

belt (See Drive Belt

 

 

Section)

 

4. Pulley wobbles

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

 

 

 

Unit stalls

1. Low engine idle

1. Increase idle, refer to

 

 

engine manual for details

 

2. Improper lubrication

2. See LUBRICATION, under

 

 

Assembly

 

3. Low oil level

3. Check oil level. Fill if nec-

 

 

essary

 

4. Defective unloader valve

4. Replace

 

 

 

Excessive noise

1. Loose engine or com-

1. Loose engine or compres-

(knocking)

pressor pulley

sor pulleys are a very com-

 

 

mon cause of compressors

 

 

knocking. Tighten pulley

 

 

clamp bolts and set-screws

 

2. Lack of oil in crankcase

2. Check for proper oil level; if

 

 

low, check for possible

 

 

damage to bearings. Dirty

 

 

oil can cause excessive

 

 

wear

 

3. Worn connecting rod

3. Replace connecting rod

 

4. Worn piston pin bushing

4. Remove piston assemblies

 

 

from the compressor and

 

 

inspect for excess wear.

 

 

Replace excessively worn

 

 

piston pin or pistons, as

 

 

required

 

 

 

16

17

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Image 9
RIDGID GP90135 Troubleshooting, Be sure that the old head, Gasket is replaced with a, New one each time, Head is removed
Page 8 Page 10

GP90135 specifications

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