Troubleshooting

 

 

 

Problem

Cause

Solution

 

 

 

 

 

 

Fluid needle will not trigger

Loose or missing fluid needle stop

Replace stop (17) or tighten setscrew

 

(17) or setscrew (16).

(16).

 

Broken fluid needle (12).

Replace fluid needle (12).

 

Air leaking around piston (21).

Replace o-ring (22) or piston assem-

 

 

bly (21).

 

Swollen piston o-ring (22).

Replace o-ring (22). Do not immerse

 

 

piston in solvent.

 

Insufficient air pressure on the trig-

Increase the air pressure or clean the

 

ger.

air line.

 

Spray tip (9) is plugged.

Clean the spray tip (9).

 

Plug (4) is in the incorrect fluid port.

Move the plug to the fluid port consis-

 

 

tent with manifold plumbing, unless

 

 

you are using the gun in a circulating

 

 

system. If you are, all fluid ports

 

 

should be open, both inside the gun

 

 

and on the manifold.

 

 

 

Fluid does not shut off.

Piston cap (18) not fully tightened.

Tighten piston cap until it bottoms

 

 

out.

 

Spring (19) not in place.

Check spring position.

 

Swollen piston o-ring (22).

Replace o-ring. Do not immerse pis-

 

 

ton in solvent

 

 

 

311053H

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Graco 288048 important safety instructions Problem Cause Solution