Graco 970185 Instructions-Parts List Manual page 9

Pneumatic Crossover Setup
(Model 970185)
Install the pneumatic crossover as shown in Fig. 3.
Also See Schematic, Fig. 6, page 19.
NOTE: During system operation, as the ram ap-
proaches the drum bottom, the top of the ram contacts
the limit valve switch. The switch shuts off air to the
ram air motor via a 4–way piloted air valve (3). As the
valve stops air to one ram, it starts air to the other ram.
This allows constant material flow and changing out of
material drums.
2
KEY
1 Ball Valves (2)
2 Regulator (2)
3 4–Way Piloted Air Valve
4 Limit Valves (2)
5 Main Air Inlet
Fig. 3
System Setup
Pneumatic Crossover Setup (Model 970185)
4
NOTE: The position of the limit valve (4) on the ram
determines when the ram air motor is turned on and
off. During operation, this position can be adjusted as
desired. See Fig. 3.
4
2
5
1
3
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