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Operation
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/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. Shut off the power to the pump.
3. In an air-powered system, close the air regulator
and close the bleed-type master air valve.
4. In a hydraulic-powered system, close the hy-
draulic supply line shutoff valve first, then the
return line shutoff valve.
5. Unlock the gun/valve trigger safety.
6. 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.
7. Lock the gun/valve trigger safety.
8. In an air–powered system, open the drain valve
(required in your system), having a container ready
to catch the drainage. 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
and relieve pressure gradually, then loosen completely.
Now clear the tip/nozzle or hose.
Packing Nut/Wet-Cup
Before starting, fill the packing nut (2) 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 N.m (95–115 ft-lb) using the
supplied wrench (109). Do this whenever necessary.
Do not overtighten the packing nut.
04995
Fig. 5
1
Bleed hole must
face down.
109
2
129
19
21
2
Torque to 128–156 N.m
(95–115 ft-lb).
2
20