User's Manual

Gun Repair
34 313227C
Piston Repair
1. Prepare gun for repair, page 28.
2. Remove the charging probe (2), see page 9.
3. Remove the air cap, page 30. Remove the gun
shroud (48).
4. Remove the jam nut (28), actuator arm (29), and
adjustment nut (30). See F
IG. 26. The fluid nozzle
(4) must be in place when removing or installing the
jam nut and actuator arm.
5. Push on the piston rod (16b) to push the piston out
the back of the gun.
6. Inspect the o-rings (16e, 16f, 16g) and u-cup pack-
ing (16d) for damage. See Table 4 and F
IG. 27.
7. Lubricate the o-rings (16e, 16f, 16g) and u-cup
packing (16d) with non-silicone grease, Part No.
111265. Do not over-lubricate.
8. Align the two stems (16c) with the holes in the gun
body and press the piston assembly into the back of
the gun until it bottoms.
9. Install and adjust the actuator arm, page 35.
FIG. 26. Actuator Arm
TI13437a
28 29 30 16b
Table 4: Piston O-Rings
Description Function
Shaft O-Ring
(16g)
Seals cylinder air along the piston rod
(16b). Replace if air leaks along rod.
Front O-Ring
(16e)
Air shutoff seal. Replace if air leaks from
air cap when gun is de-triggered.
Back O-Ring
(16f)
Separates cylinder air from fan and
atomizing air.
U-Cup (16d) Replace if air leaks from small vent hole
at back of manifold when gun is trig-
gered.
FIG. 27. Piston O-Rings
TI1575A
TI1576A
16a
16d
16c
16f
16e
16g
16b
16e
16g
16f
16d
Atomizing Air Side
Fan Air Side