22
Service
Replacing the fluid valve packings
Fig. 26
1
13
13a
26*
16*
22*
20*
23*
19
21
35*
1.
Remove the fluid valve nut (19), air valve spring
(22), and air valve assembly (26). Discard the air
valve assembly. See Fig. 26
2.
Using a mechanical pick, remove the u-cup pack-
ing (16) from the gun body.
3.
Place the new u-cup packing (16) on the packing
installation tool (29), with the u-cup lips facing the
tool as shown in Fig. 27.
4.
Push the packing (16) into the back of the gun until
a definite snap is felt.
5.
Using a mechanical pick, remove the u-cup packing
(20) and spacer (35) from the fluid valve nut (19). Be
careful not to damage the seal surface or the nut’s
internal threads.
6.
Install a new u-cup packing (20) with the packing
installation tool (29); the u-cup lips must face
toward the tool as shown in Fig. 28. This will help
apply even pressure to the u-cup lips and avoid
damaging them.
7.
Push the u-cup packing (20) and spacer (35) into
the fluid valve nut (19) until a definite snap is felt.
Fig. 27
*U-cup lips face the
tool
16*
29
Fig. 28
20 or 25b*
29
*U-cup lips
face the tool
19 or 25a
