6
307001
Operation
Pressure Relief Procedure
WARNING
PRESSURIZED EQUIPMENT HAZARD
The system pressure must be manually
relieved to prevent the system from
starting or spraying accidentally. To re-
duce the risk of an injury from accidental spray
from the gun, splashing fluid, or moving parts, fol-
low the
Pressure Relief Procedure
whenever you:
D
are instructed to relieve the pressure,
D
stop spraying,
D
check or service any of the system equipment,
D
or install or clean the fluid tips.
1.
Shut off the air to the pump.
2.
Close the bleed-type master air valve (required in
your system).
3.
Hold a metal part of the dispensing valve firmly to
the side of a grounded metal waste container, and
trigger the gun to relieve pressure.
4.
Open the drain valve (required in your system),
having a container ready to catch the drainage.
5.
Leave the drain valve open until you are ready to
spray again.
If you suspect that the nozzle or hose is completely
clogged, or that pressure has not been fully relieved
after following the steps above, very slowly loosen the
hose end coupling and relieve pressure gradually, then
loosen completely. Now clear the obstruction. Refer to
your separate gun instruction manual, if necessary.
Fill the Wet Cups
Keep the wet-cups 1/3 full of ISO Pump Lube to pre-
vent fluid from drying on the displacement rod and
damaging the pump packings.
Flush the Pump
WARNING
To reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure
on page 6.
The displacement pump was factory tested in light oil,
which was left in to protect the pump parts. To prevent
contamination of the fluid being pumped, flush the
pump before using it. Be sure the solvent used is
compatible with the fluid being pumped.
Place each pump intake into a separate, grounded pail
of solvent. Direct the fluid outlet into a waste container.
Open the dispensing valve. Open the bleed-type
master air valve. Slowly open the pump air regulator
until the pump is running smoothly – about 40 psi (280
kPa, 2.8 bar). Operate the pump until clean solvent is
coming from the outlet.
Relieve the pressure
. If you
are flushing to prepare the pump for storage, leave the
pump and dispensing equipment filled with solvent to
help protect it from corrosion.
Startup and Priming
Note:
These are general operating instructions for the
proportioning pump. Your specific installation may
require a slightly different startup procedure. Consult
your Graco representative if you have any questions.
1.
Using proper moisture-control equipment for your
feed/supply pumps, place the RES (Resin) hose in
the RES supply container and the ISO (Isocya-
nate) hose in the ISO supply container.
2.
Open the bleed-type master air valve and set the
pump air regulator to 40 psi (280 kPa) (2.8 bar).
Operate the pump until all air is purged from the
hoses, then close the air valve.
3.
Prime the pump and hoses fully before connecting
to the dispensing gun or valve.
4.
Connect the dispensing gun.
Summary of Contents for Hydra-Cat A Series
Page 4: ...4 307001 Notes ...
