Graco 25T471, Manual

Page: 14 / 28

Operation
14 3A7931B
4. Set a can of fluid on the ram base, centering it under
the Wiper Plate (AU).
5. Loosen the Wiper Bleed Valve (AW) enough to
allow any air trapped under the wiper plate to
escape. Keeping hands away from the lip of the can
and the wiper plate, set the ram director valve
switch (AP) to the “down” position. Lower the ram
until the wiper plate enters the can, then reduce the
air pressure.
NOTE: If the wiper plate does not enter the can easily,
increase the ram pressure; once the wiper plate enters
the can, immediately reduce the pressure.
6. Continue lowering the ram until fluid appears
through the wiper plate vent hole. Stop lowering the
ram, then tighten the Wiper Bleed Valve (AW)
securely. See F
IG
. 4 on page 9.
Start and Adjust the Pump
1. Supply fluid to the pump per the requirements of
your system. See Prime the Pump and Pump
Fluid on page 16.
2. Close the Pump Air Regulator (AE).
3. Set the Ram Air Regulator (AF) to 50 psi (3.5 bar).
4. Adjust the Ram Director Switch (AP) to the “up”
position.
5. Install the fluid can into the cartridge or onto the ram
base.
6. Set the Ram Air Regulator (AF) to 25 psi (1.8 bar)
7. For 300 CC model or 600 CC model: Move the
Ram Director Switch (AP) to the “down” position,
then lower the Cartridge Rod (AZ) slowly until it
touches the fluid cartridge cover.
For 1 Gallon model: Move the Ram Director Switch
(AP) to the “down” position, then lower the Wiper
Plate (AU) slowly until it touches the fluid’s surface.
For detailed information, see step 5 and 6 of
Start
and Adjust the Ram .
8. Reduce the air motor regulator pressure to zero and
open the Bleed-type Master Air Switch (AC).
If the can has a welded seam, position it with the seam
facing the rear of the pump to avoid injury due to splat-
tering fluid if the can leaks at the seam.
F
IG
. 8: Wiper Plate Vent Hole
Wiper Plate Vent Hole
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 during operation and whenever the pump is
charged with air. During operation, the priming piston
extends beyond the intake housing to pull material into
the pump. This can amputate a hand or finger caught
between the priming piston and intake housing. Follow
the
Pressure Relief Procedure on page 12 before
checking, clearing, or cleaning the priming piston.