Operation/Maintenance
Pressure Relief Procedure
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
install or clean the spray tip
INJECTION HAZARD
WARNING
1.
Lock the gun trigger safety
.
2.
Shut of
f the air supply to the pump.
3.
Close the bleed-type master air valve (required in
your system).
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),
and have 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,
slowly loosen the tip
guard retaining nut or hose end coupling and relieve
pressure gradually
, then loosen it completely
. Then
clear the tip or hose.
Wet-Cup
Keep the wet-cup filled with Graco Throat Seal Liquid
(TSL) or compatible solvent to help prolong the
packing life. See manual 307–619 for additional care
instructions.
NOTE: 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 the pump out
with a compatible solvent before using the sprayer
.
See
Flushing the Pump
on page 10.
WARNING
T
o reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure
at left.
Never allow the pump to run dry of the fluid being
pumped. A dry pump will quickly accelerate to a high
speed, possibly damaging itself. If your pump
accelerates quickly
, or is running too fast, stop it
immediately and check the fluid supply. If the supply
container is empty and air has been pumped into the
lines, refill the container and prime the pump and the
lines with fluid, or flush and leave it filled with a
compatible solvent. Be sure to eliminate all air from
the fluid system.
Starting and Adjusting the Pump
Begin
these steps
before
you install the spray tip.
1.
Ensure that the air regulator (D) and bleed-type
master air valve (E) are closed. See Fig. 2 on
page 6.
2.
Connect a suction hose (M) to the pump’
s fluid
inlet, or lower the pump into a fluid supply
container.
3.
Hold a metal part of the spray gun (K) firmly to the
side of a grounded metal pail and hold the trigger
open.
4.
Open the pump’
s bleed-type master air valve (B).
5.
Slowly open the air regulator (D) until the pump
starts (at approximately 40 psi [2.8 bar]).
6.
Cycle the pump slowly until all the air is pushed
out and the pump and hoses are fully primed.
7.
Release the spray gun trigger and lock the trigger
safety
. The pump should stall against pressure
when you release the trigger
.
