Graco 25E079, Operation

Page: 15 / 52

Supply System Operation
3A5379B 15
6. With hands away from the pail and the platen, push
down on the ram director valve (AC) handle, and
lower the ram until the platen rests on the lip of the
pail. Move the ram director valve handle to the hori
-
zontal position (neutral).
7. Lower ram:
a. Set the ram director valve (AC) to DOWN and
continue to lower the ram until fluid appears at
the platen bleed port (J), and close the platen
bleed port. Set the ram director valve to neutral,
reinstall the vent handle, and tighten securely.
Start and Adjust Pump
1. Connect the pump outlet fittings and the hose (not
supplied).
NOTE: Be sure all components are adequately sized and
pressure rated to meet the system’s requirements.
2. Turn the driver disconnect switch (K) OFF. Then set
the ram air regulator (AB) to about 50 psi (0.35 MPa,
3.5 bar). Set the ram director valve (AC) to DOWN.
3. Turn the driver disconnect switch (K) ON.
4. Start the pump. See Pump Operation on page 13.
5. Keep the ram director valve (AC) set to DOWN while
the pump is operating.
NOTE: Increase air pressure to the ram if the pump does
not prime properly with heavier fluids. Decrease air pres
-
sure if fluid is forced out around the top seal or platen.
Change Drums
1. Stop the pump by turning the disconnect switch (K)
OFF.
2. Raise the platen out of the drum.
a. Press and hold the blowoff air button (AG) until
the platen (D) is completely out of the drum. Set
the ram director valve (AC) to UP to raise the
platen (D). Use the minimum amount of air pres
-
sure necessary to push the platen out of the
drum.
3. Release the blowoff air button and allow the ram to
rise to its full height.
4. Remove the empty drum.
5. Inspect the platen and, if necessary, remove any
remaining material or material build–up.
6. Place the full drum on the ram base.
7. Lower the ram and adjust the position of the drum
relative to the platen. See Start and Adjust Ram on
page 14.
Shutdown and Care of the Pump
1. Set the ram director valve (AC) to DOWN.
2. Follow the Pressure Relief Procedure on page 14.
3. Follow the pump shutdown instructions in the sepa
-
rate pump manual.
J
D
r_255648_313527_7a
Excessive air pressure in the material drum could
cause the drum to rupture, causing serious injury. The
platen must be free to move out of the drum. Never
use drum blowoff air with a damaged drum.