Graco 218-026, Instructions-Parts List Manual

Page: 25 / 32

307-638 25
SERVICE
ES ON–OFF Valve 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. Tighten the nut (35) and torque it
to 0.225 N
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 muffler (80) from the gun handle and replace
with a new muffler.
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 Valve Check Retainer
80 Muffler
81 Spring
85 Bulkhead Retainer
Fig 22 Fig 23
KEY
2 Key
4 Regulator Disk
35 Nut
36 Wave Washer
37 Valve Lever
38 O–Ring
39 Air Valve
36
37
35
38
4
39
38
71
80
70
85
77
81
78
Apply
sealant
to outside
surface
2
Torque to
0.225 N m
(2 in–lb)