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Adjusting the Needle Packings
Needle packings require adjustment once a month
under normal use to ensure fluid does not leak back
through packings. Needle packings must also be
adjusted whenever the needle is removed or adjusted.
To adjust the needle packings:
1. Flush gun as instructed on page 14.
2. Remove air cap retaining ring (28), air cap (29),
spring (26), and detent plate (26). See Fig. 21.
3. Trigger gun while removing fluid nozzle (25) with
nozzle wrench (P), provided. Clean gun as
instructed on page 15.
CAUTION
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 being scratched.
P
25
26
29
28
Fig. 21
4. Trigger gun while slightly turning packing nut (9)
clockwise with packing wrench (K), provided. See
Fig. 22. This compresses packings.
The packings need very little pressure to seal well.
If needle binds, packings are too tight; back
packing nut off 1/16 turn. Needle should then
move freely. If packings are over-tightened, they
may be damaged and may need to be replaced.
Service
Fig. 22
5. Trigger gun while installing fluid nozzle (25) with
nozzle wrench (P). See Fig. 21.
6. Install spring (26) into front of gun.
7. Install detent plate (26) into gun housing with open
sockets (S) facing up; align detent plate tab (T)
with notch in gun housing. See Fig. 23.
8. Install air cap (29), aligning air cap balls (U) with
detent plate sockets (S). See Fig. 23. Secure air
cap with air cap retaining ring (28).
NOTE: If installed correctly, air cap will snap into 4
definite positions, with no loose rotation.
S
24
8075A
T
26
Fig. 23
8
DETAIL
9
K
29
U
S
8078B
02966
308810
17
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