HP 311051D User Manual download pdf (Page 21)

Troubleshooting

311051D 21

Fluid needle will not trigger. Loose or missing fluid needle stop

(29) or setscrew (30).

Air leaking around piston (3).

Swollen piston o-ring (8).

Insufficient air pressure on trigger.

Plug (19) is in incorrect fluid port.

Replace stop or tighten setscrew.

Replace o-ring (8) or piston.

Replace o-ring. Do not immerse pis-

ton in solvent.

Increase air pressure or clean air

line.

Move plug to fluid port consistent with

manifold plumbing, unless you are

using gun in a circulating system. If

you are, all fluid ports in gun and on

manifold should be open.

Fluid does not shut off. Worn o-ring (11) or (9).

Piston cap (4) not fully tightened.

Spring (6) not in place.

Swollen piston o-ring (8).

Replace o-ring.

Tighten piston cap until it bottoms

out.

Check spring position.

Replace o-ring. Do not immerse pis-

ton in solvent

Problem Cause Solution

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HP 311051D User Manual Page 21