308-385
31
Service
Air Cap/Nozzle/Resistor Stud
Replacement (continued)
6. Make sure the electrode needle (13) is tightened
properly. Refer to Fig. 22.
7. Install the resistor stud (15) in the fluid nozzle (14).
Tighten to 10 in-lb (1.12 N
S
m). See Fig. 21.
8. Install the fluid nozzle (14) and resistor stud (15)
assembly with the nozzle wrench (76). See
Fig. 20. Tighten until the fluid nozzle seats in the
gun barrel (1/8 to 1/4 turn past hand-tight).
9. Carefully install the air cap (12). Avoid bending the
electrode wire (13) and be sure to insert the elec-
trode wire through the center air cap hole. Rotate
the air cap horns to the desired position.
10. Make sure the o-ring (9) is in place on the retaining
ring (1). Tighten the air cap retaining ring (1) until
the air cap is held firmly in place; you should not
be able to rotate the air cap horns by hand.
11. Test the gun resistance as instructed on page 27.
12. Install the gun onto the manifold and bracket as
instructed on page 39.
Electrode Needle Replacement
1. Prepare the gun for service as instructed on
page 29.
2. Remove the air cap, fluid nozzle, and resistor stud
as instructed on page 30. Remove the gun shroud.
3. Unscrew and remove the electrode needle (13)
with the electrode wrench (82). See Fig. 22. Be
careful not to damage the contact wire.
If the fluid rod turns, hold the back end of the fluid
rod (C).
4. Apply low-strength
(purple) Loctite
r
or equivalent
thread sealant to the fluid rod threads.
Hold the back end of the fluid rod (C) to prevent it
from turning while installing the new electrode
needle (13) finger-tight. Do not over-tighten the
electrode needle.
5. Install the gun shroud.
CAUTION
To avoid damaging the plastic threads or contact
wire, be very careful when installing the electrode
needle.
6. Install the fluid nozzle, resistor stud, and air cap
assembly as instructed at left.
7. Test the gun resistance as instructed on page 27.
8. Install the gun onto the manifold and bracket as
instructed on page 39.
Apply low-strength
(purple) Loctite or equivalent to the fluid
rod threads, then install the electrode needle (13) finger-tight; do
not over-tighten.
03219
Fig. 22
82
13
C
