PROBLEM

 

CAUSE

CORRECTION

Knocking Noise.

 

Possible defect in safety

Operate safety valve manually

 

 

valve.

by pulling on ring. If valve still

 

 

 

 

leaks, it should be replaced.

 

 

Defective check valve.

Remove and clean, or replace.

 

 

Loose pulley.

Tighten pulley set screw,

 

 

 

 

see Parts manual for torque

 

 

 

 

specifications.

 

 

Loose flywheel.

Tighten flywheel screw, see

 

 

 

 

Parts manual for torque

 

 

 

 

specifications.

 

 

Compressor mounting

Tighten mounting screws,see

 

 

screws loose.

Parts manual for torque

 

 

 

 

specifications.

 

 

Loose belt.

Loosen wingnut and then

 

 

tighten wingnut until it contacts

 

 

 

 

 

 

 

 

the washer, plus one turn.

 

 

Carbon build-up in pump.

Have checked by a Trained

 

 

 

 

Service Technician.

 

 

Belt to tight.

Loosen wingnut and then

 

 

 

 

tighten wingnut until it contacts

 

 

 

 

the washer, plus one turn.

 

 

 

 

 

Excessive belt

 

Loose belt.

Loosen wingnut and then

wear.

 

 

 

tighten wingnut until it contacts

 

 

 

 

the washer, plus one turn.

 

 

Tight belt.

Loosen wingnut and then

 

 

 

 

tighten wingnut until it contacts

 

 

 

 

the washer, plus one turn.

 

 

Loose pulley.

Have checked by a Trained

 

 

 

 

Service Technician.

 

 

Pulley misalignment.

See "Motor Pulley/Flywheel

 

 

 

 

Alignment" paragraph in the

 

 

 

 

Maintenance section.

 

 

 

 

 

Squealing

 

 

 

See Oil-Checking paragraph in

 

Compressor pump has no

sound.

 

oil.

 

the Maintenance section.

 

 

 

 

Loosen wingnut and then

 

 

Loose belt.

 

 

 

 

 

tighten wingnut until it contacts

 

 

 

 

the washer, plus one turn.

 

 

 

 

 

 

 

 

 

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Craftsman 919.728001, A15256 owner manual Problem Cause Correction