12
308147
Operation/Maintenance
(ALL PUMPS)
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/valve trigger safety.
2.
Shut off the air or hydraulic supply to the pump.
3.
In air-powered systems, close the bleed-type
master 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/valve safety latch.
5.
Hold a metal part of the gun firmly to the side of a
grounded metal pail, and trigger the gun/valve to
relieve pressure.
6.
Lock the gun trigger safety.
7.
Open the drain valve (required in your system)
and/or the pump bleeder valve, having a container
ready to catch the drainage.
8.
Leave the drain valve open until you are ready to
spray/dispense 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.
Packing Nut/Wet-Cup
Fill the packing nut/wet-cup (3) 1/3 full with Graco
Throat Seal Liquid (TSL) or compatible solvent. See
Fig. 5. Using the supplied wrench (104), adjust the
packing nut weekly so it is just snug; do not overtigh-
ten. Follow the Pressure Relief Procedure at left.
Flushing the Pump
The pump is tested with lightweight oil, which is left in
to protect the pump parts. If the fluid you are using
may be contaminated by the oil, flush it out with a
compatible solvent before using the pump.
WARNING
For your safety, read the warning section, Fire or
Explosion Hazard on page 5 before flushing, and
follow all recommendations given there.
Fig. 5
0566C
3
34, 35
104
Model 222837
Shown
1
Bleed hole must
face down.
1
