Graco S20 Operation page 26

Operation
platen, causing blowoff air to escape between
the platen and drum, move the ram director
valve (BC) to the DOWN position to begin
lowering the ram until the drum makes contact
and realigns with the ram base.
Material splatter may occur as the platen exits the
drum. Wear appropriate protective equipment when
in the work area to help prevent serious injury from
splashing fluid.
NOTE: Read the Drum Change Troubleshooting
section on page 26 for additional information if the
drum appears to be stuck on the platen.
D
Drum Lip
F . 21
IG
7. Use the minimum amount of blowoff air pressure
necessary to push the platen out of the drum.
8. Release the blowoff air button and allow the ram to
rise to its full height. 2-Button Interlock: If the
system has this feature, the ram will stop as it nears
the top. Press and hold both buttons to raise the
ram completely. See F
9. Remove the empty drum.
Use a long-handled flat-bladed scraper if it is
necessary to scrape the bottom of the platen (D). To
avoid serious injury, do not put your hands or other
body parts under the platen or near the pump inlet.
26
. 4 on page 14.
IG
10. Inspect the platen (D) and, if necessary, remove any
remaining material or material build–up.
11. Follow the procedure to Load Drums on page 22.
Drum Change Troubleshooting
If the material drum begins to lift off of the ram base:
1. Slow the lift speed of the ram by moving the ram
director valve (BC) just above the neutral position.
2. Press and hold the blowoff button (BG).
3. When the drum makes contact with the ram base,
move the ram director valve (BC) up slightly to
increase the ram lift speed.
4. Repeat the up and down motion of the ram director
valve (BC), while pressing the blowoff button (BG),
to adjust the lift speed and maintain contact
between the material drum and ram base.
Perform steps 5-7 if the material drum rises significantly
above the ram base and the drum tilts to one side on
the platen, causing blowoff air to escape from between
the platen and drum.
5. Place the ram director valve (BC) in the neutral
position to stop the ram from rising.
To prevent serious injury, keep hands and feet clear
of the material drum as the drum is lowered and
makes contact with the ram base plate.
6. Slowly move the ram director valve (BC) towards
the DOWN position to begin lowering the ram until
the drum makes contact and realigns with the base
plate.
7. Pay attention to the position of the drum as it
lowers and makes contact with the base plate. If
the drum lowers onto the drum stops, the drum will
not fully realign with the platen (D). Lift the ram,
without using blowoff air, then lower it again to
reposition the drum on the base plate. It may be
necessary to perform this step multiple times to
fully realign the drum with the platen (D).
313526S