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.

Check belt tension, see

 

 

Adjusting Belt Tension in the

 

 

 

 

 

 

 

 

Maintenance section.

 

 

Carbon build-up in pump.

Have checked by a Trained

 

 

 

 

Service Technician.

 

 

Belt to tight.

Check belt tension, see

 

 

 

 

Adjusting Belt Tension in the

 

 

 

 

Maintenance section.

 

 

 

 

 

Excessive belt

 

Loose belt.

Check belt tension, see

wear.

 

 

 

Adjusting Belt Tension in the

 

 

 

 

Maintenance section.

 

 

Tight belt.

Check belt tension, see

 

 

 

 

Adjusting Belt Tension in the

 

 

 

 

Maintenance section.

 

 

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.

 

 

 

 

Check belt tension, see

 

 

Loose belt.

 

 

 

 

 

Adjusting Belt Tension in the

 

 

 

 

Maintenance section.

 

 

 

 

 

 

 

 

 

25-ENG

D27042

Page 25
Image 25
Porter-Cable C7550 instruction manual ENG D27042