Graco 970204 Instructions And Parts List page 9

Pneumatic Crossover Setup
(Model 970204)
Install the pneumatic crossover as shown in Fig. 3.
Refer also to manual 310293.
During system operation, as the ram approaches 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. 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.
KEY
A 2–Way Valves (2)
B Regulator
C 4–Way Piloted Air Valve
D Limit Valves (2)
E Main Air Inlet
Fig. 3
System Setup
Pneumatic Crossover Setup (Model 970204)
B
C
E
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.
A
D
8887A
310365
9