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Adjusting
the Needle
Packings
The needle packings require adjustment once a
month under normal use to ensure fluid does not leak
back through the needle packings. The needle pack-
ings must also be adjusted whenever
the
needle
is
removed or adjusted.
To
adjust the needle packings:
1.
First flush the gun as instructed on page
14.
2.
Remove the air cap retaining ring
(29),
air cap
26.
(27),
spring
(25),
and detent plate
(26).
See Fig.
3.
Trigger the gun while you remove the fluid nozzle
Fig.
26.
Clean the gun as instructed on page
15.
(19)
with the nozzle wrench
(P),
provided. See
ICAUTIOY
1
Trigger the gun whenever you tighten or remove
the nozzle. This keeps the needle seat away from
the nozzle seating surface and prevents the seat
from beina scratched.
K
98
5.
Trigger the gun while you install the fluid nozzle
(19)
with the nozzle wrench
(P).
See Fig.
26.
6.
Install the spring
(25)
into the front of the gun.
7.
Install the detent plate (26) into the gun housing
with its open sockets
(S)
facing
up;
align the det-
ent plate tab
0
with the notch in the gun hous-
ing. See Fig.
28.
8.
Install the air cap
(27),
aligning the air cap balls
(U)
with the detent plate sockets
(S).
See Fig.
28.
Secure the air cap with the air cap retaining ring
(29).
Fig.
26
4.
Trigger the gun while you turn the packing
nut
(9)
slightly clockwise with the packing wrench
(K),
provided.
See
Fig.
27.
This will compress the
packings.
The packings need very
little
pressure to
seal
tight; back the packing nut
off
1/16
turn. The
well. If the needle binds, the packings are
too
are over-tightened, they may be damaged and
needle should then move freely. If the packings
need to be removed and replaced.
02854
NOTE
If installed correctly, the air cap will snap into
4
definite positions, with no loose rotation between the
positions.
Fig.
28
02868
308-336
17