Graco VPM 12, Instructions Manual

Page: 29 / 88

Change Drum
313875J 29
Change Drum
Remove Drum
1. Open main air slider valve on the integrated air con-
trols and set ram air regulator to 40 psi (0.28 MPa,
2.8 bar).
2. Set ram director valve handle to UP then immedi-
ately press and hold the blowoff air button until the
platen is completely out of the drum. Use minimum
amount of air pressure 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 drum.
Install Drum
1. If platen is inside a drum, perform Remove Drum
procedure.
2. If the platen is not at its full height, set ram director
valve handle to UP and allow the ram to rise to its
full height.
3. Inspect platen and, if necessary, remove any
remaining material or material build-up.
4. Lubricate the platen seals with grease or other lubri-
cant compatible with the fluid you will pump.
5. Place full drum on the ram base, slide it back
against the drum stops, and center it under the
platen.
6. Remove the drum cover and smooth the surface of
the fluid with a straightedge.
7. Remove bleed stick from platen bleed port (J).
8. If drum has a plastic liner, pull it over edge of drum.
Secure liner with tape wrapped around circumfer-
ence of drum.
9. Set the director valve to DOWN and lower the ram
until fluid appears at the top of the platen bleed
port (J). Adjust ram air regulator as needed.
Increase air pressure to the ram if the pump does
not prime properly with heavier fluids. Decrease air
pressure if fluid is forced out around the top seal or
platen.
10. Set the director valve to neutral and close the platen
bleed port (J).
11. Perform Priming procedure, see page 30.
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.
NOTICE
To avoid damage to the platen seals, do not use a
drum that is dented or damaged.
J
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