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 start, refer to the separate 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 WARNING 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
SKIN INJECTION HAZARD
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
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 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 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
d.For long term shutdown or storage, always fill the sprayer with mineral spirits to prevent pump corrosion. Relieve pressure!
8.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, disas- semble the intake valve as instructed in manual 311762 and move the ball stop pin to a higher set of holes. This increases the ball travel.
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