Graco 310692C manual Replacing the pattern adjustment valve packings

4.Unscrew the packing screw (8) from the insert (4) with the gun tool (28).

5 6 7

4

Service

Replacing the pattern adjustment valve packings

1.Unscrew the pattern adjustment valve assembly (25 A-D).

25A 25C

25B

25D

8 ti4834a

FIG. 29

5.Using a mechanical pick, push the three fluid pack- ings (5, 6, 7) out of the insert (4). Be careful not to damage the insert. Discard the old fluid packings.

6.Place the new fluid packings (5, 6, 7) and packing screw (8) onto the needle (13). Note the orientation of the parts.

5 6 7 8 13

4

ti4834a

FIG. 30

7.Insert the fluid needle (13) into the back of the insert

(4) to install the fluid packings (5).

8.Tighten the packing screw (8) just enough to hold the packings (5) in the insert (4). The needle (13) must move freely. Remove the needle.

ti4857a

FIG. 31

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.

29

25A 25B

FIG. 32

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.

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