Operation - Graco 918372 Instructions Manual

WARNING
MOVING PARTS HAZARD
Follow the Pressure Relief Procedure
below before checking or repairing the
ram or any other part of the system and
when shutting down the system. Keep hands and
fingers away from the follower plate, fluid pump
inlet, and lip of the fluid container when raising or
lowering the ram to reduce the risk of pinching or
amputating hands or fingers.
During operation, also keep hands and fingers
away from limit switches to reduce the risk of
pinching or amputating hands or fingers.
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, 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
install or clean the spray tip/nozzle
Use this procedure whenever you shut off the sprayer
and before checking or adjusting any part of the
system, to reduce the risk of serious injury.
1. Lock the gun/valve trigger safety.
2. Shut off the main air supply to the pump.

Operation

3. Close all air bleed valves.
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. Have a container ready to catch the drainage, then
open the drain valve or pump bleed valve.
8. Leave the drain valve open until you are ready to
spray/dispense 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
to relieve pressure gradually, then loosen completely.
Now clear the tip/nozzle or hose.
9. If you want to relieve pressure in the ram, see the
Ram Pressure Relief Procedure in Form
#310525.
Raising and Lowering the Ram
The ram hand valve on the pump air control has 3
positions (Fig. 5):
Ram UP raises the ram.
Ram DOWN lowers the ram.
Ram OFF puts the ram in "neutral." Moving the
hand valve to OFF does not change the position of
the ram, but it stops the air pressure from attempt-
ing to move the ram either up or down.
Fig. 5
Ram UP
Ram OFF (neutral)
Ram DOWN