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WARNING
INJECTION HAZARD
To reduce risk of a serious injury, includ-
ing fluid injection,
D After adjusting or servicing gun, make sure fluid
does not flow when trigger safety is locked. If
fluid does flow, gun is not assembled properly or
trigger safety is damaged. Reassemble gun or
return it to your nearest Graco distributor. Do
not use gun until problem is corrected.
D Fig. 6. When removing gun from hose, hold hex
end of fluid tube assembly (19) securely to
avoid loosening fluid tube from gun body.
1.
Relieve pressure; page 3.
2. Fig. 4. If fluid continues to flow after trigger is
released, gun valve may need adjustment, be
obstructed or damaged, or valve stem (24), seat
(26), or seal (3) may be worn or damaged.
a. Adjust valve or spring tension as instructed on
page 5.
b. Replace valve seal, stem, or seat as instructed
on page 6.
c. To inspect valve for obstruction or damage,
disassemble gun as instructed on page 7.
Clean and inspect parts. Replace any worn or
damaged parts and assemble gun as
instructed on page 7.
3. Follow torque, sealant and lubrication notes.
Service
Adjusting Valve
Trigger travel and valve opening is factory set to 1 in.
(25.4 mm). Use following procedure to adjust setting,
1.
2. Disconnect gun from hose.
3. Fig. 4. Loosen stem nut (1) and spring housing
(28).
4. Insert a 1/8 hex allen wrench through hole in
spring adjustment screw (21) and into spring
housing (28).
5. Turn spring housing (28) and stem nut (1) to
change trigger travel and size of valve opening.
6. Tighten stem nut (1) to set adjustment.
7. Adjust spring adjustment screw (21) to desired
trigger pull force.
Adjusting Spring Tension
1.
2. Disconnect gun from hose.
3. Fig. 4. Turn spring adjustment screw (21) as
needed until spring force is adjusted to close
valve.
Relieve pressure; page 3.
Relieve pressure; page 3.
309495 5
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