Graco 256855 Repair Manual page 7

Seal Replacement and Adjustment Procedure
1. Remove air cap ring (10) and air cap housing (9)
2. Slide trigger pin (14) over to needle removal position.
Lower trigger (13) to disengage needle.
3. Remove fluid nozzle (44)
4. Remove needle (44). Check fluid needle for damage
or wear.
5. Remove housing nut (7) and remove housing (3)
from gun body
6. Remove packing nut (8d), spacer (8c), packing (8b),
and spreader (8a) from housing (3).
7. Install new spreader (8a) and packing (8b) in housing
(3). Note orientation of spreader and packing.
8. Install spacer (8c).
9
10
313317H
44
needle
3
9. Install packing nut (8d) but don't tighten until needle
(44) is installed.
10. Install housing (3) into gun body and secure with nut
(7).
11. Lubricate and install needle and fluid nozzle (44)
12. Raise trigger (13) to engage needle
13. Tighten packing nut (8d)
14. Trigger gun to test needle movement. If needle does
not return after trigger is released or is slow to return,
loosen packing nut slightly until needle returns freely.
15. Make sure gun fluid packing's are sealing properly by
spraying solvent.
16. If fluid packings leak, tighten packing screw slightly
and re-test until packing's seal completely.
14
13
8d
8c
8b
8a
8
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Operation
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2
15
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