Graco Inc 312900C, 247936, 247937 Replace Air Cap/Nozzle, Replace Fluid Needle

Gun Repair

Replace Air Cap/Nozzle

NOTICE

Hold the front end of the gun up and trigger the gun while removing the nozzle to help drain the gun and prevent any paint or solvent left in the gun from entering the air passages.

1.Prepare gun for repair page 27.

2.Remove probe.

3.Remove the retaining ring (27) and air cap (9). See FIG. 13.

4.Point gun up and squeeze trigger while removing the fluid nozzle (7) assembly with the multi-tool (37).

29 26

7b

7a

7

9	37
	ti12726

27a*

27

Fig. 13. Replace Air Cap/Nozzle

Fire, Explosion, and Electric Shock Hazard

The nozzle contact ring (7a) is a conductive contact ring, not a sealing o-ring. To reduce the risk of spark- ing or electric shock, do not remove the nozzle contact ring (7a) except to replace it and never operate the gun without the contact ring in place. Do not replace the contact ring with anything but a genuine Graco part.

Use non-silicone grease, Part No. 111265, on the small o-ring (7b). Do not over-lubricate. Do not lubri- cate the contact ring (7a).

5.Lightly lubricate the o-ring (7b). Install it and the contact ring (7a) on the nozzle (7).

Make sure the fluid needle (29) is finger- tight (page 28).

6.Trigger gun while installing the fluid nozzle (7) with the multi-tool (37). Tighten until the fluid nozzle seats in the gun barrel (1/8 to 1/4 turn past hand-tight).

7.Install the air cap (9) and retaining ring (27). Make sure the u-cup (27a*) is in place with the lips facing forward.

Replace Fluid Needle

1.Prepare the gun for repair page 27.

2.Remove the air cap and nozzle, page 28.

3.Unscrew the fluid needle (29). Hold the packing rod end (26) to prevent it from turning, FIG. 13.

4.Apply low-strength (purple) Loctite® or equivalent thread sealant to the fluid needle and packing rod threads. Install the fluid needle finger-tight. Do not overtighten.

5.Install the fluid nozzle and air cap, page 28.

28 312900C