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 FIG. 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.

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.

Service

7.Install the o-rings (31) on the fluid needle assembly (12). Lubricate with light weight oil.

CAUTION

Be sure to keep the needle straight when installing it in the piston housing. If the needle is bent it must be replaced.

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).

311053C