Graco DynaMite 224906, Instructions-Parts List Manual

Page: 7 / 14

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Service
WARNING
SKIN INJECTION HAZARD
To reduce the risk of serious injury, fol-
low the
Pressure Relief Procedure on
page 5 before checking or servicing
any part of the system and whenever you are
instructed to relieve the pressure.
To reduce the risk of a punture wound, hold the
valve securely, and keep your hands away from the
needle nozzle when operating the valve.
Tools Required
D Adjustable Wrenches
D Torque Wrench
D 1/4 in. (6 mm) Diameter Rod
D
Flat Blade Screwdriver
D
O-ring Pick
D
PTFE Tape
D
Medium Strength Thread Sealant
Disassembly
NOTE: Repair Kit 235272 is available to service the
dispense valve. For the best results, use all the parts
in the kit, even if the old parts look good. Parts in-
cluded in the kit are marked with an asterisk, for exam-
ple (1*).
1. Shut off the fluid supply. Follow the Pressure Re-
lief Procedure on page 5.
2. Disconnect the air and fluid lines to the dispense
valve.
3. Using a wrench on the flats, unscrew the needle
nozzle housing (12) from the valve housing (11).
See Fig. 4.
NOTE: To change the needle nozzle, see page 3.
4. Using a wrench, unscrew the valve housing (11)
from the cylinder (9). Pull the housing away from
the cylinder, being careful not to damage the valve
needle (1) which is attached to the cylinder.
5. Pull the valve seat (13) out of the valve housing
(11). Inspect the seat for wear.
NOTE: The valve seat (13) is reversible.
6. Unscrew the packing retainer (4) from the valve
housing (11) with a flat blade screwdriver. Using an
o-ring pick, remove the u-cup packing (3) from the
housing. Clean the housing in a compatible sol-
vent.
7. Inspect the valve needle (1) for scoring or damage.
If damaged, unscrew it from the cylinder (9).
Reassembly
1. Apply medium strength sealant to the threads of
the valve needle (1*), and screw it into the cylinder
(9) until it bottoms out. Torque to 6–10 in–lb
(0.7–1.1 N.m).
2. Lubricate the PTFE u-cup (3*). Using a 1/4 in. (6
mm) diameter rod, gently work the u-cup into the
valve housing (11) until it seats,
with the lips facing
into the housing.
3. Apply medium strength sealant to the threads of
the packing retainer (4*) and screw it into the valve
housing (11) until it bottoms out. Torque to 20–30
in–lb (2.3–3.4 N.m).
4. Orient the air inlet fitting (A) and the fluid inlet (C)
in any position you wish, relative to each other.
Join the cylinder (9) and valve housing (11), care-
fully guiding the needle (1*) into the valve housing
(11) and through the u-cup (3*). Screw the valve
housing (11) onto the cylinder (9), handtight.
5. Insert the valve seat (13*) into the male end of the
valve housing (11) until it bottoms out.
6. Apply medium strength sealant to the threads of
the needle nozzle housing (12) and screw it onto
the valve housing (11). Torque to 20–30 in–lb
(2.3–3.4 N.m).
NOTE: If the needle nozzle (14) was removed from the
housing (12), replace as explained on page 3.
7. Reconnect the air and fluid lines to the dispense
valve.