Troubleshooting; General Troubleshooting - Graco 288844 Instructions Manual

Troubleshooting

Troubleshooting
SKIN INJECTION HAZARD
Follow Pressure Relief Procedure on page 10.
Read warnings, page 4.

General Troubleshooting

Problem
Fluid leakage from back of fluid
packing area.
Air leakage from gun.
Fluid leakage from front of gun.
Fluid in air passages.
Slow fluid shut-off.
No fluid output when triggered.
18
Cause
Worn packings or needle shaft.
Air valve not seating properly.
Needle ball worn or damaged.
Worn seat assembly.
Fluid viscosity too low for proper
seal with carbide seat.
Spray tip seal leaking.
Leaking around seat housing.
Fluid inlet fitting leaking.
Fluid buildup on fluid needle
components.
Spray tip plugged.
Fluid filter or fluid hose plugged.
• Check all possible remedies in the trouble-
shooting charts before disassembling the gun.
• Some improper patterns are caused by the
improper balance between air and fluid.
Solution
Replace needle assembly (2).
Clean or replace air valve (8).
Replace needle assembly (2) and seat (5c).
Replace the seat (5c) and gasket (5b, model
G40 gun only). The gasket must be replaced
whenever the seat assembly is removed.
Do not reverse the direction of the plastic seat
(5c, model G15 gun only) if it is worn. The
seat must be replaced it if is worn.
Install plastic seat (5c).
Tighten retaining ring (6) or replace spray tip
(33).
Replace the gasket (5b, model G40 gun
only). The gasket must be replaced whenever
the seat assembly is removed.
Replace the fluid tube gasket (22). The gas-
ket must be replaced whenever the fluid tube
connector is removed.
Remove and clean or replace the fluid needle
assembly (2).
Clean spray tip. See page 14.
After tip removal (see above), very slowly
loosen the hose end coupling at the gun and
relieve pressure gradually. Then loosen com-
pletely to clear the obstruction. Clean or
replace filter (12).
311001F