Graco BULLDOG HYDRA-CAT 208958, Instructions-Parts List Manual

Page: 11 / 26

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Operation
Fill the Throat Packing Nuts
Keep the displacement pumps’ throat packing nuts
filled with Graco Throat Seal Liquid (TSL) to help pre-
vent fluid from drying on the displacement rod and
damaging the pump packings. See
Accessories.
Flush the Pump
The equipment was factory tested in light oil, which
was left in to protect the parts. Before using the equip-
ment to mix and dispense fluid, flush as follows:
Place each pump intake into a separate 5 gallon,
grounded pail, containing about 3 gallons (12 liters) of
mineral spirits solvent.
Holding a metal part of the gun/dispensing valve firmly
to the side of a grounded metal pail, trigger the gun/
dispensing valve, open the mixer inlet valves, and
completely close all the air regulators (turn handle
counterclockwise until spring tension is released).
Turn on the air supply to the feed pumps, and slowly
open the air regulators until the pumps start. Let the
pumps run slowly until clean solvent is coming from
the gun/dispensing valve. Then release the trigger, set
the safety latch, and shut off the air supply to the
pumps.
Repeat the flushing procedure using a solvent compat-
ible with the fluid you are going to use. When clean
solvent is coming out of the gun/dispensing valve, re-
move the solvent supply from the feed pumps intakes.
Slowly run the pump to push all the solvent out of the
lines, then stop the pumps.
Set the air pressure to the solvent pump at about 60
psi (0.4 MPa, 4 bar). Slowly open the air shutoff valve
to the pump, and let the pump prime and stall against
pressure. Open the mixer solvent valve briefly to be
sure the solvent will be supplied when it is needed.
WARNING
Always close the air supply valve to the pump be-
fore opening the drain valves to relieve system
pressure. This will reduce the risk of excessive
pressure buildup in the opposite component hose
and fittings.
Startup and Priming
Install full containers of part A and part B at the fluid
inlets of the appropriate feed pumps. Refer to the
Typ-
ical Installations on pages 5 and 6. Disconnect the
dispensing hose from the mixer outlet and place a
grounded metal waste container under the outlet.
Open the air supply valves to the pumps and increase
the air pressure just enough to keep the pumps run-
ning. After all the air has been purged and the system
is completely primed, close the mixer fluid valves.
Open the solvent flushing valve on the mixer and keep
it open until all the mixed fluid is flushed out and clean
solvent is coming from the outlet. Then close the mixer
solvent and air valves.