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11308972
Operation
If the motor stalls during operation, turn OFF the igni-
tion key. With your hand, firmly press straight down on
the motor reset button. Now try to restart the sprayer. If
it will not s tart, r efer to the s eparate motor manual,
307158.
CAUTION
Never use a hammer to depress the reset button, as
it could cause serious internal motor damage.
4. 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 10.
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 W ARNING below .
f. Squeeze the trigger and slowly turn the pres-
sure control knob clockwise just enough to
start the pump. See Fig 6.
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 counterclock-
wise until all spring tension is relieved. You will
be able to feel it. The sprayer is now at the
lowest pressure setting. Turning the knob
further will remove it.
j. Follow the Pressure Relief Procedure on
page 10. Then install the spray tip in the gun
as instructed in the separate gun or tip instruc-
tion manual. If you are using the RAC IV
supplied with this sprayer, see manual 308644.
5. Adjusting the Pressure
a. Turn the pressure control knob clockwise to
increase and counterclockwise to decrease the
pressure. Tighten the knob locknut to set.
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 to a maximum of
3000 RPM. The sprayer warranty will be voided and
the hydraulic pump life shortened if this adjustment is
changed.
6. Cleaning a Clogged Tip
WARNING
S
K
IN INJECTION H
A
Z
A
RD
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 10.
b. Clean the front of the tip frequently during the
day to keep the fluid from building u p 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 308644.
7. Shutting Off the Sprayer
a. Whenever you stop spraying, even for a short
break, follow the Pressure Relief Procedure
Warning on page 10.
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,
page 8. Use a compatible solvent to flush,
then fill the pump and hoses with solvent such
as mineral spirits to help prevent pump corro-
sion. Relieve pressure!
d. For l ong term shutdown or storage, always fill
the sprayer with mineral spirits to prevent
pump corrosion. Relieve pressure!
8. Adjusting the Intake V alve 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, disas-
semble the intake valve as instructed in the
appropriate pump manual listed in the parts list
and move the ball stop pin to a higher set of
holes. This increases the ball travel.