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Service
Valve Stem and Seal Service
If fluid leaks past the v-block seal (3), the v-block seal
or valve stem (24) may be worn or damaged. To
replace the seal or valve stem, follow the procedure
below.
WARNING
SKIN INJECTION HAZARD
To reduce the risk of a serious injury,
including fluid injection, follow the Pres-
sure Relief Procedure on page 6
whenever you are instructed to relieve the
pressure.
1. Relieve the pressure in the system.
2. Disconnect the gun from the hose.
3. Unscrew the spring retainer (21) and remove the
spring (4). See Fig. 4.
4. Unscrew the spring housing (28) with a 1/8 inch
hex allen wrench.
5. Unscrew the valve seat nut (26).
6. Remove the adjustment bracket (20) and stem nut
(1) from the stem.
7. Remove the valve stem (24).
8. Remove the seal retainer (27) and seal (3).
Replace the seal.
9. Secure the gun body (17) in an assembly fixture.
10. Lubricate the v-block seal (3) and install it into the
gun body (17) with the lips of the seal facing into
the housing.
11. Lubricate the seal retainer (27). Torque the seal
retainer into the gun body (17) to:
Models 235627, 237607, and 237649: 50–60
in-lbs (5.6–6.8 NSm).
Models 235628 and 243775: 100–125 in-lbs
(11.3–14.1 NSm).
12. Lubricate the valve stem threads (24) and install it
into the gun body (17). Thread the stem assembly
through the v-block seal (3).
CAUTION
Installing the valve stem (24) without turning it clock-
wise could damage the v-block seal and result in
fluid leakage.
13. Thread the nut (1) all the way onto the valve stem
(24).
14. Install the adjustment bracket (20) and spring
housing (28) onto the valve stem (24).
15. Lubricate the threads and o-ring sealing surface on
the valve seat nut (26). Torque the valve seat nut
into the gun body (17) to:
Models 235627, 237607, and 237649: 70–80
in-lbs (7.9–9.0 NSm).
Models 235628 and 243775: 100–125 in-lbs
(11.3–14.1 NSm).
16. Lubricate the spring (4) and spring retainer threads
(21) and install them in the gun body (17).
17. Insert a 1/8 inch hex allen wrench through the
spring retainer (21) and into the spring housing
(28). Adjust the trigger travel and valve opening to
the desired position.
18. Using a 5/16 inch wrench, tighten the stem nut (1)
to set the adjustment.
19. Adjust the spring adjustment screw (21) to the
desired trigger pull force.