HP 288048 - Manual (Page 19)

Service
311053C 19
Reassembly
1. Perform the following applicable step:
• Non-circulating Paint Guns: Lubricate the
backup (6) and o-ring (5) and install them on the
fluid outlet port plug (4). Install the plug in the
fluid outlet port of the fluid housing (2). See F
IG .
13. Reinstall the gasket (3).
• Circulating Paint Guns: Reinstall the gasket (3)
in the fluid housing (2).
• Sealant Gun: Reinstall gasket (3).
2. Install the o-rings (22*, 23*) on the piston (21).
Install two o-rings (25*, 26*) on each of the piston
stems. Lubricate all the o-rings, the piston, and the
piston stems.
3. Install the fluid housing (2) on the piston housing (1)
with the gasket in place.
4. Reinstall the two screws (15) to secure the piston
housing to the fluid housing (2). Torque to 30 in-lb
(3.4 N•m).
5. Insert the piston (21) into the piston housing (1).
6. Remove the protective paper from the sticky side of
the gasket (13*) and adhere the gasket to the bot-
tom of the piston housing (1), making sure the three
holes in the gasket are properly aligned with the
matching holes in the housing.
7. Install the o-rings (31) on the fluid needle assembly
(12). Lubricate with light weight oil.
8. Insert the needle assembly (12) into the front of the
fluid housing (2). Push it straight back through the
piston.
9. Install a new gasket (11) in the fluid housing (2).
10. Lubricate the threads of the seat (10, 41). Screw it
into the fluid housing (2) and torque to 20-25 ft-lb
(27-34 N•m).
11. Install the needle stop (17) on the needle. Coat the
setscrew (16) with semi-permanent anaerobic seal-
ant and install the screw into the needle stop.
Torque to 4-5 in-lb (0.45-0.56 N•m). Pull on the nee-
dle to make sure it seats fully.
12. Install the springs (19, 20).
13. Lubricate the threads of the piston housing (1).
Screw the cap (18) onto the housing until it bottoms
out.
14. Model 288554 only: Hand tighten cap (18) until it
engages gasket (38). Then tighten cap a half turn
more to ensure cap will not loosen during operation.
15. Do not lubricate the gasket (8). Install the spray tip
(9) and gasket (8) in the tip retainer nut (7). Screw
the assembly firmly onto the gun. Tighten the
assembly with a wrench, but do not exceed 5 ft-lb
(6.8 N•m) for model 233670 gun.
16. Reinstall the gun on the manifold with the four
screws (14). Torque to 65 in-lb (7.3 N•m).
CAUTION
Install a new gasket (11) whenever you remove the
seat (10, 41) from the gun. Failure to install a new
gasket may result in fluid leaking into the air chamber.
CAUTION
Be sure to keep the needle straight when installing it
in the piston housing. If the needle is bent it must be
replaced.