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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.
i.
Follow the
Pressure Relief Procedure
Warning on page 8, to shut off the sprayer.
WARNING
To stop the engine in an emergency , depress
the engine STOP button. Close the bypass valve
if possible. See Fig 8. Then follow the Pressure
Relief Procedure Warning on page 8.
If the motor stalls during operation,
engine stop buttonturn OFF the ON/OFF switch. With
your hand, firmly press straight down on the motor reset
button. Now try to restart the sprayer . If it will not start,
refer to the separate motor manual, 307–158.
CAUTION
Never use a hammer to depress the reset button,
as it could cause serious internal motor damage.
3. Prime the Pump
a. Be sure the gun safety latch is engaged.
b. Don't install the spray tip yet!
c. If the engine has not been started, follow the
procedure in Step 2, page 8.
d. Disengage the gun safety latch.
e. Point the gun into a grounded metal pail and hold
a metal part of the gun firmly against the pail. See
the WARNING below.
f.
Squeeze the trigger and slowly turn the pressure
control knob clockwise just enough to start the
pump. See Fig 8.
g. Operate the pump until all air is purged from the
pump and hoses and the fluid is flowing freely
from the gun.
h. Release the trigger and engage the safety latch.
i.
Turn the pressure control knob
wise until all spring tension is relieved. Y ou will
be able to feel it. The sprayer is now at the lowest
pressure setting. T urning the knob further will
remove it.
j.
Follow the Pressure Relief Procedure on page
8. Then install the spray tip in the gun as
instructed in the separate gun or tip instruction
manual. If you are using the RAC IV supplied
with this sprayer, see manual 307–848.
Fig 10
4. Adjusting the Pressure
a. Turn the pressure control knob
increase and counterclockwise to decrease the
pressure. Tighten the knob locknut to set.
depress the
counterclock-
MAINTAIN FIRM
METAL-TO-METAL
CONTACT BETWEEN GUN
AND GROUNDED PAIL
clockwise to
b. Always use the lowest pressure that is neces-
sary to completely atomize the fluid.
CAUTION
Operating the sprayer at a higher pressure than
necessary wastes fluid, causes early tip wear, and
shortens the sprayer life.
c. If more coverage is needed, use a larger tip
rather than increasing the pressure.
d. Check the spray pattern. The tip size and angle
determines the pattern width and flow rate. See
the separate manual received with your gun.
CAUTION
The engine throttle has been set and locked at
2800 RPM. The sprayer warranty will be voided
and the hydraulic pump life shortened if this adjust-
ment is changed.
5. Cleaning a Clogged Tip
WARNING
To reduce the risk of a fluid injection injury, NEVER
hold your hand, body or a rag in front of the spray
tip when cleaning or checking for a cleared tip. To
reduce the risk of a fire or explosion, always hold
the gun firmly against the side of a grounded metal
waste container when checking to see if the tip was
cleared or when using a self–clearing tip.
a. Follow the
Pressure Relief Procedure
Warning on page 8.
b. Clean the front of the tip frequently during the
day to keep the fluid from building up and clog-
ging the tip. To clean, and to clear a tip if it clogs,
refer to your separate gun instruction manual. If
you are using the RAC IV tip guard and
SwitchTip, refer to manual 307–848.
6. Shutting Off the Sprayer
a. Whenever you stop spraying, even for a short
break, follow the Pressure Relief Procedure
Warning on page 8.
b. Clean the tip and gun as recommended in your
separate gun or tip manual.
c. Flush the sprayer at the end of each work day if
using water–based fluid or if it could harden in
the sprayer over night. See FLUSHING GUIDE-
LINES, page 6. Use a
flush, then fill the pump and hoses with solvent
such as mineral spirits to help prevent pump
corrosion. Relieve pressure!
d. For long term shutdown or storage, always fill
the sprayer with mineral spirits to prevent pump
corrosion. Relieve pressure!
7. Adjusting the Intake Valve Ball Travel.
a. The pump is set to handle medium volume, low
viscosity fluid. To adjust the pump for higher flow
or heavier viscosity fluid, disassemble the intake
valve as instructed in manual 307–862 and
move the ball stop pin to a higher set of holes.
This increases the ball travel.
compatible solvent to
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