10 308-629
Operation
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
. T
o reduce the risk of
an injury from injection, splashing fluid, or moving
parts, follow the
Pressure Relief Procedure
whenever you:
are instructed to relieve the pressure,
stop spraying,
check or service any of the system equipment,
or install or clean the spray tips.
1.
Lock the gun trigger safety
.
2.
Close the red-handled bleed-type master air valve
(35, supplied in your system).
3.
Open the fluid shutof
f valve (9).
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 return line valve (205, supplied in your
system), to relieve fluid pressure in the hose and
gun.
8.
Leave the return line 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.
Flush the Pump Before First Use
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. See
Flushing
on page 12.
Packing Nut/Wet-Cup
Before
starting, fill the packing nut (F) 1/3 full with
Graco Throat Seal Liquid (TSL) or compatible solvent.
See Fig. 5.
WARNING
T
o 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 61–75 N.m (45–55 ft-lb) using the
supplied wrench. Do this whenever necessary
. Do not
overtighten the packing nut.
Using the Airless Spray Gun
Before
operating the equipment, read the instruction
manual supplied with the gun.
Spray some test patterns before doing any finished
work. Refer to the gun manual for detailed information
on correct spraying technique.
Circulating Zinc Fluids
1. When
spraying zinc fluids, close the return line
valve (205). Circulation is not required when
spraying.
2. T
o circulate fluid back to the supply container while
you are not spraying, open the return line valve
(205), close the fluid shutoff valve (9), and lock the
gun trigger safety
. The pump will continue to run.
WARNING
T
o reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure
at left.
3.
Always relieve pressure
before overnight shut
-
down, when changing spray tips, or when checking
or servicing any part of the system. During circula
-
tion, some fluid will be present in the gun line and
must be relieved.
