Prime And Adjust The Pump - Graco Merkur W10CAS Assembly

Operation

Prime and Adjust the Pump

1. Lock gun trigger. Remove tip guard and spray tip
from gun. Refer to gun manual.
2. Close gun air regulator and pump air regulator (H)
by turning knobs counterclockwise reducing pres-
sure to zero. Close bleed-type air valve (E). Also
verify that all drain valves are closed.
3. Check that all fittings throughout system are tight-
ened securely.
4. Position pail close to pump. Do not stretch suction
hose tight/let it hang to assist fluid flow into pump.
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E
H
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5. Hold metal part of gun (L) firmly to side of grounded
metal pail, unlock trigger, and hold trigger open.
6. Pumps with runaway protection: Enable the
prime/flush function by pushing the prime/flush but-
ton on the DataTrak.
7. Open bleed-type air valve (E). Slowly open the
pump air regulator (H) until the pump starts.
8. Cycle pump slowly until all air is pushed out and the
pump and hoses are fully primed.
9. Pumps with runaway protection: Disable the
prime/flush function by pushing the prime/flush but-
ton on the DataTrak.
10. Release gun trigger and lock trigger safety. Pump
should stall against pressure.
11. With the pump and lines primed, and with adequate
air pressure and volume supplied, the pump will
start and stop as you open and close the gun/valve.
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12. Use the air regulator to control the pump speed and
the fluid pressure. Always use the lowest air pres-
sure necessary to get the desired results. Higher
pressures cause premature tip/nozzle and pump
wear.
NOTICE
Never allow the pump to run dry of the fluid being
pumped. A dry pump quickly accelerates to a high
speed, possibly damaging itself. If your pump accel-
erates quickly, or is running too fast, stop it immedi-
ately and check the fluid supply. If the supply
container is empty and air has been pumped into
the lines, refill the container and prime the pump
and the lines with fluid, or flush and leave it filled
with a compatible solvent. Be sure to eliminate all
air from the fluid system.
Shutdown and Care of the Pump
For a brief shutdown, relieve the pressure, page 11.
Stop the pump at the bottom of its stroke to prevent fluid
from drying on the exposed displacement rod and dam-
aging the throat packings.
For a longer shutdown, or overnight, always flush the
pump before the fluid dries on the displacement rod.
Relieve the pressure, page 11.
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