3M Graco 50261 Manuel D'instructions page 12

Replacing the pattern adjustment
valve packings
1
Fig. 25
1. Unscrew the pattern adjustment valve assembly (25). See fig. 25.
2. Using needle nose pliers, remove the retaining ring (25d) and
unscrew the pattern adjustment valve (25c).
3. Using a mechanical pick, remove the u-cup packings (25b) from
the pattern adjustment nut (25a). Be careful not to damage the
seal surface or the nut's internal threads.
4. One at a time, install the new u-cup packings (25b) with the
packing installation tool (29); the u-cup lips must face toward the
tool as shown in Fig. 28.
5. Push each u-cup packing (25b) into the pattern adjustment nut
(25a) until a definite snap is felt.
6. Lubricate the pattern adjustment valve (25c) threads and install
the valve into the nut (25a). Install the retaining ring (25d), then
back out the pattern adjustment valve as far as the retaining ring
allows it to go.
Service
a
Replacing the fluid valve packings
1
1
Fig. 26
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 packing (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
*
fa e the too
Fig. 28
12
1
1 a
1
19
0
li s fa e the
t l
16
29
29
20 or 25b*
19 or 25a