Operation - Graco K Series Instructions Manual

Pressure Relief Procedure
WARNING
INJECTION HAZARD
The system pressure must be manually
relieved to prevent the system from
starting or spraying accidentally. Fluid
under high pressure can be injected through the
skin and cause serious injury. To reduce the risk of
an injury from injection, splashing fluid, or moving
parts, follow the Pressure Relief Procedure
whenever you:
are instructed to relieve the pressure,
stop spraying/dispensing,
check or service any of the system equipment,
or install or clean the spray tip/nozzle.
1. Lock the gun/valve trigger safety.
2. Close the pump air bleed valve (H, required in your
system).
3. Shut off the main air bleed valve (E, required in
your system). Set the ram director valve (U) to
DOWN. The ram will slowly drop.
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 (required in your system)
and/or the pump bleeder valve (DD), having a
container ready to catch the drainage.
8. Leave the drain valve open until you are ready to
spray again.
If you suspect that the spray tip/nozzle 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.
Now clear the tip/nozzle or hose.

Operation

Starting and Adjusting the Ram
1. Refer to Fig. 1. Close all air regulators and air
valves.
2. Open the main air bleed valve (E) and set the ram
air regulator (T) to 2.8 bar, 0.28 MPa (40 psi). Pull
up on the director valve (U) handle so the arrow
points to UP, and let the ram rise to its full height.
3. Set a full 19 liter (5 gal.) pail of fluid on the ram
base, slide it back against the ram tube and sup-
ports, and center it under the wiper plate (C). To
prevent air from being trapped under the wiper
plate, scoop fluid from the center of the pail to the
sides, to make the surface concave.
your fingers and hands away from the pump intake,
wiper plate, and lip of the fluid container.
4. With your hands away from the pail and the wiper
plate, push down on the director valve (U) handle
so the arrow points to DOWN, and lower the ram
until the wiper plate rests on the lip of the pail.
Move the director valve handle to the horizontal
position (neutral).
5. Adjust the pail to be sure it is aligned with the
wiper plate, and remove the vent handle (AA) from
the wiper plate (C) to open the vent hole (BB).
6. Set the director valve (U) to DOWN and continue
to lower the ram until fluid appears at the wiper
plate vent hole (BB). Set the director valve to
neutral, reinstall the vent handle (AA) and tighten
securely. See Fig. 1.
WARNING
MOVING PARTS HAZARD
Moving parts can pinch or amputate your
fingers. When the pump is operating and
when raising or lowering the ram, keep