Periodic Maintenance; Pressure Relief Procedure; Dispense Needle Replacement; Disassembly - Graco Dispensit 710 Instructions Manual

Periodic Maintenance

Pressure Relief Procedure

Follow the Pressure Relief Procedure whenever
you see this symbol.
This equipment stays pressurized until pressure is
manually relieved. To help prevent serious injury from
pressurized fluid, such as skin injection, relieve pres-
sure when you stop dispensing and before cleaning,
checking or servicing the equipment.
1. Shut off material flow to the valve.
2. Cycle the valve three times to ensure all pressurized
material has been removed from the system.
3. Turn off the air pressure to the valve and disconnect
all of the lines.
4. The valve is now depressurized and safe to perform
maintenance on.

Dispense Needle Replacement

If no material or reduced volumes of material come out
of the dispense needle it may be partially or completely
clogged. Clean with water or solvent depending on the
material dispensed. A fine wire, used cautiously, will
help open clogged needles. Replace the needle if dam-
aged or severely clogged. Replacement needles can be
ordered for the Model 710 Dispense Valve by specifying
the proper part number. See the Model 710 Recom-
mended Spare Parts section of this manual or consult
the drawings for your exact model.

Disassembly

Refer to the illustration on page 14 and the drawings in
the back of this manual for your exact model.
Note the direction that u-cup and Posipak seals are fac-
ing as you remove them so that the replacements can
be installed facing the same way.
332094C
Note that the Gaskets (24) rarely require replacement
and are not provided in the seal kit. Retain them for
reuse after cleaning. Replacements are available from
the factory or your Dispensit dealer.
1. Turn off the air supply and remove the Connectors
(28) from the controller.
2. Turn off the material supply and remove the material
inlet line from the Adapter (15).
3. Remove the valve from its mounting.
4. Remove the Needle Seat (1) and Needle Block (23)
by removing the Nut (2).
NOTE: Also remove the O-ring (18) and Gasket (24)
associated with this needle seat. Save the gasket.
5. Remove the Retaining Plug (17) which allows the
Spring (13) to push the Valve Sleeve (3) and the
Piston Assembly (4) out of the Valve Body (5).
6. Remove the U-cup Seals (16).
7. Remove the Set Screw (27) and remove End Cap
(14) from the Valve Body (5).
8. Loosen the Hex Nut (20) and remove the Adjust-
ment Screw (21) and its O-ring (19) from the End
Cap (14).
9. Remove the O-rings (6) from the End Cap (14) and
from the Valve Sleeve (3).
10. Remove the Retaining Tube (9) from the Valve
Sleeve (3).
11. Remove the Retaining Ring (12) from the Valve
Sleeve (3).
12. Remove the Washer (11).
13. Remove the U-cup Seal (10).
14. Remove the Spacer (8).
15. Remove the Posipak Seal (7).
16. Remove the Tubing (29) from the open and close
Elbows (25) and remove the elbows and their Gas-
kets (24).
The 710 Dispense Valve is now ready for cleaning
and assembly.
Periodic Maintenance
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