Repair

Piston Repair

1.Prepare the gun for service, page 35.

2.Remove the air cap, page 37. Remove the gun shroud (2).

3.Remove the jam nut (28), actuator arm (29), and adjustment nut (30). See FIG. 30..

TI1732A

28 29 30 34b

Fig. 30. Actuator Arm

4.Push on the piston rod (34b) to push the piston out the back of the gun.

5.Inspect the o-rings (34e, 34f, 34g) and u-cup pack- ing (34d) for damage. See Table 3 and FIG. 31..

6.Lubricate the o-rings (34e, 34f, 34g) and u-cup packing (34d) with non-silicone grease, Part No. 111265. Do not over-lubricate.

7.Align the two stems (34c) with the holes in the gun body and press the piston assembly into the back of the gun until it bottoms.

8.Install and adjust the actuator arm, page 43.

Table 3: Piston O-Rings

Description

Function

 

 

Shaft O-Ring

Seals cylinder air along the piston rod

(34g)

(34b). Replace if air leaks along rod.

 

 

Front O-Ring

Air shutoff seal. Replace if air leaks from

(34e)

air cap when gun is de-triggered.

 

 

Back O-Ring

Separates cylinder air from atomizing air.

(34f)

 

 

 

U-Cup (34d)

Replace if air leaks from small vent hole

 

at back of manifold when gun is trig-

 

gered.

 

 

34a

34d

34c

34f

34e

TI1575A

34b

34d 34g

34f

34e

34g

TI1576A

Fig. 31. Piston O-Rings

42

309298J

Page 42
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Graco Inc TI1713A, 309298J, 244592, PRO Auto Xs AA important safety instructions Piston Repair, Piston O-Rings

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