Parts

Parts

255478, Dosing Valve for XM Plural-Component Sprayers

1

2

11

12

73

13 15

14

4

23

5

1

1.Apply pipe sealant to non-swiveling pipe threads.

30

8 19

46

8 10

31 32

1136

12 33

24 10

26

7 6

17 8

18

6 4

3

9

8

16 4

25 9

29 12

2.Apply lubricant to threads, o-rings, and seals.

3

Apply blue thread lock. Thread to bottom.

4

Torque to 5-7 ft-lbs (7-9 N•m).

5

Torque to 30-40 ft-lbs (41-54 N•m).

6

Tighten packing nut 1/4 turn after nut bottoms out;

 

145-155 in./lbs (16-18 N•m). Check packing nut tightness

 

about once a month. Keep packing nut filled with TSL.

7

Lubricate and press piston evenly into cylinder.

8

Clean ball housing (10) and packing cavity before

 

reinstalling packings (17, 18, 19). Lubricate packings and

 

install with lips facing down away from packing nut (7) in

 

order shown.

27 5

r_313259_313342_3

9Replace o-rings (25) when seat housing (26) is removed.

10Inspect reversible seat for damage. If one side is worn, reverse seat.

11Use o-ring (36) if replacing circulation valve 255278.

12Use if recirculation valve is not used.

8

313342D

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Graco 313342D important safety instructions Parts, 255478, Dosing Valve for XM Plural-Component Sprayers