Graco 25T471, Manual

Page: 15 / 28

Operation
3A7931B 15
9. Adjust Pump Air Regulator (AE) pressure until the
pump starts.
10. Cycle the pump slowly until all air is pushed out and
the pump and hoses are fully primed with fluid.
11. Release the dispensing device trigger and lock the
safety. The pump should stall against the pressure.
12. If the pump fails to prime properly, open the Pump
Bleeder Valve (AD) slightly. Use the bleed hole on
the underside of the valve as a priming valve until
the fluid appears through the hole, then close the
plug.
NOTE: Always use the lowest possible fluid pressure to
bleed air out of the pump.
NOTE: When changing fluid containers after the initial
priming, open the Pump Bleeder Valve (AD) to re-prime
the pump and vent any trapped air before new fluid
enters the hose. Close the valve when all air is elimi-
nated.
13. With the pump and lines primed, and adequate air
pressure and volume supplied, the pump starts and
stops as the user opens and closes the dispensing
device. In a circulating system, the pump speeds up
or slows down on demand until the air supply is shut
off.
14. Use the air motor regulator to control pump speed
and fluid pressure.
F
IG
. 9: Set Ram Director Switch for Startup
To reduce the risk of skin injection, when priming the
pump, do not use your hand or fingers to cover the
bleed hole on the underside of the bleeder valve. Use
the handle or a crescent wrench to open and close
the bleeder plug. Keep your hands away from the
bleed hole.
Ram Air
Pressure Gauge Bleed-Type Master
Air Switch
Ram Air
Regulator
Ram Director
Switch Pump Air
Regulator
F
IG
. 10: Pump Bleeder Valve
NOTICE
Do not allow the pump to run dry. It will quickly accel-
erate to a high speed, causing damage. If your pump
is running too fast, stop it immediately and check the
fluid supply. If the container is empty and air has
been pumped into the lines, refill the container and
re-prime the pump and the lines, or flush and leave it
filled with a compatible solvent. Eliminate all air from
the fluid system.
NOTICE
Always use the lowest air pressure necessary to get
the desired results. Higher pressures cause prema-
ture tip/nozzle and pump wear.
Pump Bleeder Valve
Bleed Hole