Graco Inc PRO 4500sc, 308131, 224400, 224200 manual Electrode Needle Replacement

Service

Air Cap/Nozzle/Resistor Stud Replacement (continued)

6.Trigger the gun while installing the fluid nozzle (21) and resistor stud (22) assembly with the multi-tool (62). Tighten until the fluid nozzle seats in the gun barrel (1/8 to 1/4 turn past hand tight).

7.Install air cap assembly (1, 8, 49) and retaining ring (2). Test gun resistance as instructed on page 20.

1, 8, 49

2

62

21 

22

D

25 

20

 Apply a very light coat of lubricant

Tighten 1/8 to 1/4 turn past hand tight

05154A

Fig. 11

62

21

22

Torque to 10 in-lbs (1.12 NSm)

0444A

Electrode Needle Replacement

1.Prepare the gun for service as instructed on page 22.

2.Remove the air cap, nozzle and resistor stud as instructed on page 22.

3.Unscrew and remove the electrode needle (20) with the multi-tool (62). Hold the fluid rod end to prevent it from turning. See Fig. 13.

CAUTION

Be careful not to damage the contact wire when removing the electrode from the gun.

4.Apply low-strength (purple) Loctiter or equivalent thread sealant to the electrode needle and fluid rod threads. Install the electrode needle finger-tight. Do not over-tighten it.

CAUTION

To avoid damaging the plastic threads or contact wire, be very careful when installing the electrode.

5.Install the fluid nozzle, resistor stud, and air cap assembly as instructed at left.

6.Test the gun resistance as instructed on page 20.

 20 62

Apply low-strength (purple) Loctite or equivalent to fluid rod threads

Fig. 12

Fig. 13

0378A

308131 23