8 306916
Operation
Pressure Relief Procedure
WARNING
SKIN 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:
Dare instructed to relieve the pressure,
Dstop spraying/dispensing,
Dcheck or service any of the system equipment,
Dor 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
(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 or service the pump, relieve the
pressure to prevent the pump from starting acci-
dentally.
Flush the Pump Before Using
This pump was tested with water, and some of it may
still be in the pump. If the water will contaminate the
fluid you are pumping, flush it out with a compatible
solvent before using.
Keep the packing nut/wet-cup (45) 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. See Fig. 3. Do not
use TSL with food or sanitary applications.
Starting and Adjusting the Pump
1. Make sure the air regulator (C), drain valve (H),
and pump bleeder valve plug (52) are closed.
2. Open the bleed-type master air valve (D).
3. Hold a metal part of the gun/valve firmly to the side
of a grounded metal pail, and trigger the gun/valve.
4. Slowly open the air regulator (C) until the pump
starts running slowly (about 20 psi [1.4 bar,
0.14 MPa]). Run the pump slowly until all the air is
purged from the pump and lines.
5. If the pump is not priming properly, open the
bleeder valve plug (52) slightly. Use the bleed hole
on the underside of the valve body (50) as a
priming valve until the fluid appears at the hole.
Close the plug (52).
WARNING
To reduce the risk of fluid injection, do not use your
hand or fingers to cover the bleeder hole when
priming the pump.
