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Valve Stem and Seal Service
If fluid leaks past v-block seal (3), v-block seal or valve
stem (24) may be worn or damaged. Use following
procedure to replace v-block seal or valve stem.
1.
Relieve pressure; page 3.
2. Disconnect gun from hose.
3. Fig. 4. Unscrew spring retainer (21) and remove
spring (4).
4. Unscrew spring housing (28) with a 1/8 inch hex
allen wrench.
5. Unscrew valve seat (35).
6. Remove adjustment bracket (20) and stem nut (1)
from stem.
7. Remove valve stem (24).
8. Remove seal retainer (27) and v-block seal (3).
Replace v-block seal.
9. Secure gun body (17) in an assembly fixture.
10. Lubricate and install v-block seal (3) into gun body
(17) with lips of seal facing into housing.
6 309495
Service
11. Lubricate and torque seal retainer (27) into gun
body (17) to 100–125 in-lb (11.3–14.1 NSm).
Installing valve stem (24) without turning it clockwise
could damage v-block seal and result in fluid leak-
age.
12. Lubricate and install valve stem threads (24) into
gun body (17). Thread stem assembly through
v-block seal (3).
13. Thread nut (1) all way onto valve stem (24).
14. Install adjustment bracket (20) and spring housing
(28) onto valve stem (24).
15. Apply high strength anaerobic sealant (red) to
threads on valve seat (35). Torque valve seat
into gun body (17) to 26–32 ft-lb (35.3–43.4 NSm).
16. Lubricate and install spring (4) and spring retainer
threads (21) in gun body (17).
17. Insert a 1/8 inch hex allen wrench through spring
retainer (21) and into spring housing (28). Adjust
trigger travel and valve opening to desired position.
18. Tighten stem nut (1) to set adjustment.
19. Adjust spring adjustment screw (21) to desired
trigger pull force.
CAUTION
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