Drum Changing - Graco Therm-O-Flow Plus Manual

WARNING
To reduce the risk of serious burns, always wear
eye protection, gloves, and protective clothing
when working around hot melt equipment and hot
melt materials.
When the follower plate appears to be extended fully
to the bottom of the material drum, and the pump
begins to cavitate, a drum change is necessary. Follow
the procedure below to change the drum on a fully
heated machine.
1. Close the air motor isolation ball valve (Fig. 20).
2. Place the ram UP/DOWN lever (Fig. 24) in the UP
position .
Fig. 24
18 309180

Drum Changing

3. Adjust the ram plate/drum separation air regulator
Fig. 25
PH00019
(R, Fig. 25) to 20–30 psi (138–207 kPa, 1.4–2.1
bar).
WARNING
Excessive air pressure in the material drum could
cause the drum to rupture, causing serious injury.
The ram plate must be free to move out of the
drum. Never use drum separation air with cold
adhesive or a damaged drum.
WARNING
Positive pressure is released from the drum when
the ram plate seal is pulled clear. Always wear
protective clothing and stand directly in front of the
ram control box when removing the drum.
R
PH00014