Rebuild; Disassembly - Graco Dispensit 1092 Operation & Maintenance Manual

Rebuild

Disassembly

1. For models with cycle detection sensors, discon-
nect the electrical power from the cycle detection
sensors. Note the position of the sensors, then
remove them by loosening the set screws and slid-
ing them out carefully.
2. Turn off the material inlet pressure to the 1092.
3. Cycle the valve a few times to remove residual
material pressure.
4. Turn off the air pressure to the 1092.
5. Remove the air pressure lines from the air supply
Tee Fittings (17 & 17). Do not remove the fittings
themselves.
6. Remove the material inlet line from the Inlet Block.
7. Remove the dispense valve from its mounting.
8. Remove the Screws, that hold the Needle Block
Assembly to the Inlet Block. The Needle Block
Assembly may look different than the illustration as
it may have multiple needles. If the needle is a
removable #10-32 or Luer Lock type consider
removing it to protect it.
9. Remove and inspect the gasket. If it is in good con-
dition you can re-use it; otherwise, discard it and
secure a replacement.
10. Remove the Screws that attach the Inlet Block to
the Main Body (27). If necessary for cleaning,
remove any adapter fitting (not shown) that may be
installed in the Inlet Block.
11. Remove the o-rings.
12. Remove the four Screws (18) and the End Cap (19)
on each side of the valve. Disconnect the short air
line sections on each side.
332089C
13. Remove the two Spool Shift Pistons (21) from the
End Caps (19). They should come out easily but if
not use low pressure (less than 2 psi or 0.1 bar) air
at the Tee Fitting (17) to move them. Remove the
U-cup seals (4) from the Spool Shift Pistons (21).
14. At the top of the valve, remove the four Screws (1)
and remove the Drive Cylinder End Cap Assembly
(2). Disconnect the air line from the Tee Fitting (17).
15. Separate the Dispense Piston (3) from the Metering
Rod (11).
16. Remove the two U-cup seals (4) from the Dispense
Piston (3).
17. Remove O-ring (5) from the Divorced Section (10).
18. Remove the Screws (16) that hold the Divorced
Section (10) to the Main Body (27) and remove
O-ring (15).
19. Remove the Metering Rod (11) and Seal Cup (12)
from the Divorced Section (10).
20. Push the Seal Cup (12) off the Metering Rod and
remove the Posipak seal (13).
21. Use snap ring pliers to remove Retaining Ring (6)
and Washer (7) from the Divorced Section (10).
Remove the U-cup seal (8).
22. Remove the Dispense Sleeve (14) from the Main
Body (27).
23. Remove the Screws (20) that hold the Seal Plate
Cups (26) to each side of the Main Body (27). The
Seal Retainer Washers (22), and the Posipak Seals
(23) will come off with the Seal Plate Cups.
24. Push the Spool Assembly (24) out with a finger. If it
does not slide out, tap it gently using a wood or
plastic dowel.
Rebuild
33