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Operation
Pressure Relief Procedure
WARNING
INJECTION HAZARD
Fluid under high pressure can be in-
jected through the skin and cause seri-
ous injury. To reduce the risk of an injury
from injection, splashing fluid, or moving parts, fol-
low the
Pressure Relief Procedure
whenever you:
D
are instructed to relieve the pressure,
D
stop spraying/dispensing,
D
check or service any of the system equipment,
D
or install or clean the spray tips/nozzles.
1. Lock the gun/valve trigger safety.
2. Shut off the air to the pump.
3. Close the bleed-type master air valve (required in
your system).
4. Unlock the gun/valve trigger safety.
5. Hold a metal part of the gun/valve firmly to the side
of a grounded metal pail, and trigger the gun/valve
to relieve pressure.
6. Lock the gun/valve trigger safety.
7. Open the drain valve and/or the pump bleeder
valve (required in your system), having a container
ready to catch the drainage.
8. Leave the drain valve open until you are ready to
dispense again.
If you suspect that the spray tip or hose is completely
clogged, or that pressure has not been fully relieved
after following the steps above,
very slowly
loosen the
tip guard retaining nut or hose end coupling and relieve
pressure gradually, then loosen completely, then clear
the tip or hose.
WARNING
MOVING PARTS HAZARD
Moving parts can pinch or amputate your
fingers or other body parts. When the
pump is operating, the priming piston (Q)
(located at the pump intake) and the air motor pis-
ton (located behind the air motor shield) move.
Therefore, never operate the pump with the air mo-
tor shield removed, and keep your fingers and
hands away from the priming piston.
Before attempting to clear an obstruction from the
priming piston (Q) or service the pump, follow the
Pressure Relief Procedure
at left to prevent the
pump from starting accidentally.
Flush the Pump Before Using
The pump is tested with lightweight oil, which is left in
to protect the pump parts. If the fluid you are using
may be contaminated by the oil, flush it out with a
compatible solvent before using the pump.
Keep the wet-cup (136) one-half full with Graco Throat
Seal Liquid (TSL), to help prevent the fluid being
pumped from drying on the displacement rod and
damaging the packings. Do not use TSL with food or
sanitary applications.
WARNING
For your safety, read the warning section
Fire or
Explosion Hazard
on page 4 before flushing, and
follow all recommendations given there.
