Operation - Graco 253017 Instructions-Parts List Manual

Pressure Relief Procedure
WARNING
SKIN 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. Get immediate
surgical treatment. To reduce the risk of an injury
from injection, splashing fluid, or moving parts,
follow 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 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.

Operation

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.
Starting and Adjusting the Ram
1. Refer to Fig. 7. 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 (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 drum of fluid on the ram base, slide it
back against the tube stop, and center it under the
wiper plate (C). Use the drum clamps (17) to
center, hold, and properly align the drum with the
ram. Then remove the drum cover and smooth the
surface of the fluid with a straightedge.
your fingers and hands away from the pump intake,
wiper plate, and lip of the drum.
NOTE: Do not use drums that have side bungs or
large dents with this ram. Rough bung openings or
large dents will damage the wipers or stop the wiper
plate, resulting in a runaway pump.
4. Push down on the director valve handle so the
arrow points to DOWN, and lower the ram until the
wiper plate is just ready to enter the drum, then set
the valve to neutral. Reposition the drum as neces-
sary so the wipers will not hit the drum lip, then
open the check valve (CC) on the wiper plate.
5. Set the director valve to DOWN and continue to
lower the ram until fluid appears at the check
valve (CC). Set the director valve to neutral and
close the check valve.
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
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