Start And Adjust The Pump - Graco A Series Instructions - Parts Manual

5. Loosen the wiper plate bleed valve (303) enough to
allow air trapped under the wiper plate to escape.
With your hands away from the lip of the can and
the wiper plate, set the ram director valve switch
(36) to the down position and lower the ram until the
wiper plate enter the can. Reduce the air pressure
when the plate enters the can.
NOTE: If the wiper plate does not enter the can easily,
increase the ram pressure; once it enters the can,
immediately reduce the pressure.
6. Continue to lower the ram until fluid appears at the
wiper plate vent hole. Tighten the wiper plate bleed
valve (303) securely. See F
7. Clamp the can in place with the clamps (24) and
wing screws (39), being sure the clamp catches the
lip of the can.

Start and Adjust the Pump

The air motor piston and fluid piston (located inside the
air motor cylinder and coupling) move when air is sup-
plied to the motor. Do not place your hand or fingers
into the air motor coupling cavity while the pump is
operating.
Also, keep hands and fingers away from the priming
piston (see F . 9 on page 19) during operation and
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whenever the pump is charged with air. During opera-
tion, the priming piston extends beyond the intake
housing to pull material into the pump and can ampu-
tate a hand or finger caught between it and the intake
housing. Follow the Pressure Relief Procedure on
page 9 before checking, clearing, or cleaning the prim-
ing piston.
1. Supply fluid to the pump per the requirements of
your system. See Prime the Pump and Pump
Fluid on page 12.
2. Close the pump air regulator (27A).
3. Set the ram air regulator (27B) to 50 psi (3.5 bar).
4. Set the ram director valve (36) to the down position.
5. Reduce the air motor regulator pressure to zero and
open the air motor valve.
308302U
. 1 on page 6.
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6. Adjust the air motor regulator until the pump starts.
Pressure Gauge
F . 5: Set Ram Director Valve for Startup
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7. Cycle the pump slowly until all air is pushed out and
the pump and hoses are fully primed.
8. Release the dispensing device trigger and lock the
safety. The pump should stall against the pressure.
To reduce the risk of skin injection, do not use your
hand or fingers to cover the bleed hole on the under-
side of the bleeder valve when priming the pump. Use
the handle or a crescent wrench to open and close
the bleeder plug. Keep your hands away from the
bleed hole.
9. If the pump fails to prime properly, open the pump
bleeder valve slightly. Use the bleed hole on the
underside of the valve as a priming valve until the
fluid appears at the hole. Then close the plug.
Operation
Ram Air Regulator
Ram Director Valve
11