HP AUTOMATIC XT SPAY GUNS 311051D - Manual (Page 23)

Service
311051D 23
Service
Items Needed for Service
• 1/16 in. Hex Wrench - provided
• 3 mm Hex Wrench
• Adjustable Wrench
• 4 mm Hex Wrench
• Pliers
• Lubricant part no. 111265; see Accessories, page
33, to order
• Compatible Solvent
Replace Fluid Packings and Air
Seals
1. Perform Pressure Relief Procedure, page 17.
2. Unscrew the four screws (13) and remove the gun
from the manifold.
3. Remove the air cap retainer (25) and air cap (24).
See F
IG . 18.
4. Remove the piston cap (4) from the piston housing
(1). Remove the springs (6, 7).
5. Using a 1/16 in. hex wrench loosen the fluid needle
set screw (30). Remove the needle stop (29).
6. Pull the fluid needle (5) out the back of the gun.
7. Check the fluid needle (5) for damage or excessive
wear. Replace the needle tip (5a) or the entire nee-
dle if necessary.
8. Remove nozzle (23). Check nozzle and o-ring (36)
for damage. You may need to use a pick to remove
o-ring from housing (2).
9. Remove the piston. Using a pliers, pull the piston (3)
out of the piston housing (1). See F
IG . 20.
10. Unscrew the two screws (14) and separate the fluid
housing (2) and the piston housing (1). Remove
gasket (12) only if it needs to be replaced. See F
IG .
20.
11. Remove the packing nut (16) with a wrench.
12. Remove the fluid packing (17) from the nut (16).
Discard the old fluid packing.
Air Section Repair Kit 288171 and Fluid Section
Repair Kit 288135 are available. Purchase the kits
separately.
F IG . 18
TI8102a
24, 25
23
13
4
F IG . 19
F IG . 20
36
TI8198a
14
14
1
2
TI8173a