Graco Inc 312578H Repair, Disassembly, Follow Pressure Relief Procedure

Repair

Repair

Follow Pressure Relief Procedure, page 7.

See Parts, page 14, for callout references.

Disassembly

1.Unscrew retaining ring (14) to remove air cap (13b). Check o-rings (13a and 13c) and replace if necessary.

2.Trigger gun while unscrewing nozzle (11) to prevent needle damage.

3.Check o-ring (19) and replace if necessary.

4.Remove fluid control valve (8), spring (26), needle (9), and nut (7). Inspect. Replace tip (9c), needle (9), and u-cup seal (20) as necessary. If replacing needle tip, use low strength thread adhesive on needle tip threads.

5.Remove spring (28) and push the air valve assembly (6) out the back of the gun. Inspect. Replace air valve assembly (6) and u-cup seal (20) as necessary. Use tool (33) to install u-cup seal.

6.Remove trigger nut (22), trigger pin (21), wave washer (18), and trigger (10).

7.Unscrew needle packing nut (17) and remove u-cup packing (16) and spreader (15).

8.Remove air control valve assembly (5). Inspect and replace as necessary.

9.Remove air inlet valve assembly (27). Inspect and replace as necessary.

Do not remove the fluid inlet fitting. It was

attached to the gun body with permanent thread locker. There is also no need to remove the air inlet fitting.

12 312578H