21
Service
Replacing the pattern adjustment valve packings
Fig. 25
1
25c
25a
25b*
25d
1.
Unscrew the pattern adjustment valve assembly
(25). See Fig. 25.
2.
Using a needle nose pliers, remove the retaining
ring (25d) and unscrew the pattern adjustment
valve (25c).
3.
Using a mechanical pick, remove the u-cup pack-
ings (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.