Fluid Needle Replacement; Fluid Pecking Repl.cement - Graco 907-292 Instructions-Parts List Manual

Fluid Needle Removal (See Figs 7 and 8)
Remove the air cap and fluid tip as described in the
Operation Section under Clean the Air Cap and Fluid
Tip. Turn the cylinder air off. Remove the electrode
resistor (55). Note the position of the adjusting screw
(39),
and remove adjusting screw, retaining nut (35),
spring
(63)
and washer
(68).
Remove plate
(37),
by
removing the four screws (12). Loosen the needle pack-
ing nut
(23)
half a turn, using the wrench
(83c)
supplied.
With a long nose pliers pull out the needle assembly
(64)
from the back of the actuator.
KEY
23 Packing Nut
83c Wrench
Fig 8
~~~39
~~35
68
KEY
12 Screw
35 Retaining Nut
37 Plate
39 Adjusting Screw
63 Spring
68 Washer
Fluid Needle Replacement
The fluid needle assembly
(64)
is sent from the factory
with retaining nuts
(34)
set for the correct length. If
these nuts are moved, reset them to the proper dimen-
sion shown in Fig
9.
Before replacing the needle assembly, thoroughly
lubricate with petroleum jelly. Twist the needle when
installing into gun.
KEY
34 Retaining Nuts
64 Fluid Needle Assy.
F:1:';i:~~~ ~
I
64
I
Fig 9 _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
Install the plate
(37)
with the four screws (12). Install the
adjusting screw
(39),
retaining nut (35), spring
(63)
and
washer (68). Set adjusting screw (39) to its original posi-
tion. See Fig 7.
12
307-896
Install the electrode resistor (55) with the wrench (83d)
supplied. See Fig
6.
Install the air cap and fluid tip as
described in the Operation Section under Clean the Air
Cap and Fluid Tip.
Apply air to cylinder air port of the gun. Adjust the pack-
ing nut
(23)
with the wrench
(83c)
supplied (See Fig
8)
until there is light packing resistance on the needle.
If the fluid needle packing
(4)
or resistor tube
(48)
have
to be replaced, the resistor tube must be refilled with
dielectric grease as described in Resistor Tube
Regreasing, Regreasing with Barrel/Resistor Tube
Disassembled.
Barrel Removal
Remove the fluid needle as described in Fluid Needle
Removal.
Loosen the barrel nut (28) using wrench (83b) supplied.
Pull the gun barrel forward off resistor tube. Be careful
not to lose the gasket (24). See Fig 12.
KEY
'0.
28 Barrel Nut
39 Adjusting Screw
83b Wrench
28
Fig 10 _______________________________ _
Fluid Packing Replacement
Remove the gun barrel
(60)
as described in Barrel
Removal.
Remove the packing nut
(23)
from the rear of the barrel
using the wrench (83c) supplied. See Figs 8 and 11.
Remove the insulator (44) from the gun barrel.
Place the barrel on the bench in a vertical position with
the back of the barrel touching the bench. Insert the rod
(83e)
supplied in the front of the barrel and gently tap
out the needle packing (4) and supports (20, 29).