Graco Dura-Flo 2400 Instructions-Parts List Manual page 13

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. 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,
D check or service any of the system equipment,
D or install or clean the spray tips.
1. Lock the gun trigger safety.
2. Shut off the air or hydraulic supply to the pump.
3. In air-powered systems, close the bleed-type mas-
ter air valve (required in your system).
In hydraulic-powered systems, close the hydraulic
supply line valve first, then the return line valve.
4. Unlock the gun trigger safety.
5. Hold a metal part of the gun firmly to the side of a
grounded metal pail, and trigger the gun to relieve
pressure.
6. Lock the gun trigger safety.
7. Open the drain valve (required in your system),
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 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 or hose.
Operation/Maintenance
(All PUMPS)
Packing Nut/Wet-Cup
Before starting, fill the packing nut (3) 1/3 full with
Graco Throat Seal Liquid (TSL) or compatible solvent.
See Fig. 5.
WARNING
To reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure at left.
The packing nut is torqued at the factory and is ready
for operation. If it becomes loose and there is leaking
from the throat packings, relieve pressure, then
torque the nut to 128–156 NSm (95–115 ft-lb) using the
supplied wrench (104). Do this whenever necessary.
Do not overtighten the packing nut.
Model 222899
Shown
Bleed hole must
1
face down
3
104
Fig. 5
34, 35
1
0566B
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