30897210
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. 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 install or clean the spray tip.
1. Engage the gun safety latch.
2. Open the bypass valve.
3. Turn the ignition key to OFF.
4. Close the fuel shutoff valve.
5. Disengage the gun safety latch. Hold a metal part
of the gun firmly to the side of a grounded metal
pail, and trigger the gun to relieve pressure.
6. Engage the gun safety latch.
7. Open the pressure drain valve, having a container
ready to catch the drainage. Leave the 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,
wrap a rag around the tip
guard retaining nut or hose end coupling and VERY
SLOWLY loosen the part to relieve pressure gradually,
then loosen completely. Now clear the tip or hose.
1. Prepare the Fluid
a. Prepare the fluid according to the fluid manu-
facturer’s recommendations.
b. Place the pump or suction tube into the fluid
container.
2. Starting the Sprayer
a. Open the bypass valve to make startup easier.
In the open position, the valve lever is parallel
to the body of the valve. See Fig 6. Close the
filter drain valve.
b. Turn the pressure control knob
counterclock-
wise
until all spring tension is relieved. You will
be able to feel it. The sprayer is now set at the
lowest pressure setting. Turning the knob fur-
ther will cause it to fall off.
c. Open the fuel shutoff valve. See Fig 6.
d. If the engine is cold, close the choke by turn-
ing the lever to the ON position (horizontal).
See Fig 6.
3. Turn and hold the ignition key to START until you
hear the engine “catch”, then release the key to
RUN. See Fig 6. If the engine does not start,
open the choke a little (push the choke head in).
If the engine floods, open the choke all the way
and try again.
e. After the engine is warm, gradually open the
choke lever (push choke head in completely)
and close the bypass valve. See Fig 6.
PRESSURE
CONTROL
KNOB
BYPASS
VALVE
AIR FILTER
FUEL
SHUTOFF
VALVE
CHOKE
ON/OFF
SWITCH
Fig 6
7874A
NOTE: In cold weather, run the engine for about 15
minutes with the bypass valve open before
starting the displacement pump, to help avoid
hydraulic motor stalling.
f. Follow the Pressure Relief Procedure
Warning on page 10, to shut off the sprayer.
WARNING
To stop the engine in an emergency, turn OFF
the ignition key. Close the bypass valve if possible.
See Fig 6. Then follow the Pressure Relief Proce-
dure Warning on page 10.
