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WARNING
INJECTION HAZARD
To reduce the risk of a serious injury,
always follow the Pressure Relief Pro-
cedure on page 6 whenever you are
instructed to relieve the pressure.
Packing, Seal, & Needle Replacement
NOTE: Repair Kit 214822 is available for repacking
the gun. Parts included in the kit are marked with a
dagger (for example (5{), in the text and drawings.
The needle assembly is not included.
1. Relieve the pressure. Disconnect the fluid hose.
2. Unscrew the extension tube nut (A) from the
swivel housing (9). Remove the valve seat (31{)
and gaskets (7{). See Fig. 7.
3. Unscrew access plug (10) and remove gasket (5{).
4. Remove the nozzle screw (27).
5. Unscrew the tube adapter (25) from the front of the
gun body (22) and pull the extension tube (30)
over the needle assembly.
6. Unscrew the pivot (14) and remove the trigger (21).
7. Grasp the safety knob (35) hex with an 11/16 inch
open end wrench. Unscrew it from the gun body
(22).
8. Grasp the adjusting nut (19) flats with an adjustable
wrench and pull it out far enough to loosen the cap
screw (3) with a 3/32 inch socket head wrench.
9. Unscrew the packing screw (20) with a 3/8 inch
open end wrench.
10. Carefully push the valve rod (16) assembly out the
front of the valve.
CAUTION
Handle the valve seat (31{) and valve stem (28{)
carefully to avoid damaging the hard carbide
portion of these parts.
Service
11. Carefully remove the v-packings (15{) and the
glands (17{, 18{) from the back of the gun body,
using a hooked pick.
12. Clean all parts with a compatible solvent. Dry them
and inspect for damage. Replace parts as needed.
13. Install the screw (27) in the top of the swivel
housing (9). Install the new seal (13{), washer (6{)
and the spring (4). Place the new gasket (5{) on
the access plug (10). Install the plug and torque it
to 22 to 23 ft-lb (20 to 31 NSm).
14. Be sure the needle assembly is the correct length.
See the DETAIL in Fig. 6. If adjustment is needed,
loosen the nut (12) and screw the valve rod (16) in
or out as needed. Tighten the nut (12).
15. Lubricate the smooth shaft of the valve rod (16)
Insert the threaded end of the needle assembly
through the front of the gun.
16. One at a time, slide the new male gland (18{) and
six v-packings (15{) –with the lips of the v-pack-
ings facing the front of the gun body– onto the
back of the valve rod (16). Slide the packings into
the packing cavity. Insert the new female gland
(17{) and press it gently into the packing cavity to
help seat the packings.
17. Screw the packing screw (20) loosely into the cavity.
18. Install the trigger (21) and pivot (14).
19. Place a new washer (6{) on the valve rod and
thread the adjusting nut (19) onto it. Hold the
adjusting nut with an adjustable wrench. Thread
the cap screw (3) a few turns into the nut.
20. Place a new gasket (23{) on each side of the front
of the trigger guard (24). Screw the tube adapter
(25) into the front of the valve. Torque the adapter
to 20 to 25 ft-lb (27 to 34 NSm).
21. Slide the extension tube (30) over the needle assem-
bly and screw it onto the tube adapter (25). Screw the
tube nut (A) onto the swivel housing (9).
22. Tighten the packing screw (20) just enough to stop
leakage; over-tightening results in leaking.
23. Before using the gun, follow the procedure for
Adjust the Needle, page 9.
306627
11
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