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307-638 25
SERVICE
ES
ON–OFF V
alve
Removal & Replacement
1. Loosen and remove the nut (35). Remove the lever
(37)
and washer (36). See Fig 22. Insert the hex head
wrench
into the hex end of the valve (39),
and turn it
to
loosen and remove the valve.
2. Clean and inspect parts for wear or damage. Re-
place if necessary. Lubricate the o–rings (38) and
valve
(39) with petroleum jelly
.
3. Install
the regulator disc (4)
so that the beveled face
of
the disc faces into the valve (39).
4. Install the valve (39) with the regulator disc (4) and
o–rings
(38) into the gun handle (2) so that the larger
opening
of the
valve cylinder faces toward the front of
the
gun handle (2).
5. Install
the wave washer (36), lever (37), and nut (35)
on
the valve stem. T
ighten the nut (35)
and torque it
to
0.225 N
S
m (2 in–lb).
Fluid Adjusting Screw Replacement
Remove the retaining ring (23) from the fluid adjusting
screw
(28). Refer to the Parts Drawing. Unscrew and re
-
move the fluid adjusting screw from the back of the gun
handle. Install the new assembly
.
Muffler and Check Valve Replacement
1. Remove the screw (71), adapter retainer (70) and
bulkhead retainer (85) from the gun handle. See
Fig 23.
2. Pull
the muf
fler (80) from the gun handle and replace
with
a new muf
fler.
3. Insert
a 3.18 mm (0.125 in.) rod into one of the holes
in the valve check retainer (78) and pry it out of the
adapter
retainer (70). Be ready to catch the ball (77)
and spring (81).
4. Install
a new ball (77) and spring (81) in the adapter
retainer
(70) and snap the valve
check retainer (78)
back
into place on the adapter retainer
.
5. Install the adapter retainer (70) and bulkhead
retainer
(85)
on the gun handle using the screw (71).
KEY
70 Adapter
Retainer
71 Screw
77 Ball
78 V
alve Check Retainer
80 Muffler
81 Spring
85
Bulkhead Retainer
Fig
22
Fig 23
KEY
2 Key
4 Regulator Disk
35 Nut
36 W
ave W
asher
37 V
alve Lever
38 O–Ring
39
Air V
alve
36
37
35
38
4
39
38
71
80
70
85
77
81
78
Apply
sealant
to outside
surface
2
T
orque to
0.225 N
Sm
(2 in–lb)