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5. Check all fluid connections for leaks. Relieve
the fluid pressure before tightening connections.
6. Install the spray tip and tip guard. Engage the
gun safety latch. See Fig. 4. Install the spray tip
according to the instructions supplied with it.
7. Adjust the spray pattern.
a. Increase the pressure just until spray from the
gun is completely atomized. Use the lowest
pressure needed to get the desired results. This
reduces overspray and fogging, decreases tip
wear and extends the life of the sprayer.
b. If more coverage is needed, use a larger tip
rather than increasing the pressure.
c. Test the spray pattern. T o adjust the pattern,
engage the gun safety latch, loosen the retaining
nut. Position the tip guard horizontally for a hori-
zontal pattern or vertically for a vertical pattern.
Then tighten the retaining nut.
GUN SAFETY
LATCH SHOWN
ENGAGED
GUN SAFETY LATCH
SHOWN DISENGAGED
Fig. 4
ON/OFF SWITCH
OUTLET NIPPLE
Fig. 5
Startup
PRESSURE ADJUSTING KNOB
PRESSURE
DRAIN
VALVE
DRAIN HOSE
Cleaning a Clogged Tip
WARNING
INJECTION HAZARD
To reduce the risk of serious injury,
whenever you are instructed to relieve
pressure, follow the Pressure Relief
Procedure on page 8.
1. Clean the front of the tip frequently during the day's
operation. First, relieve pressure.
2. If the spray tip does clog, release the gun trigger, en-
gage the gun safety latch, and rotate the RAC IV
handle 180 . See Fig. 6.
3. Disengage the gun safety latch and trigger the gun
into a waste container. Engage the gun safety latch
again.
4. Return the handle to the original position, disengage
the gun safety latch, and resume spraying.
5. If the tip is still clogged, engage the gun safety latch,
shut off and unplug the sprayer, and open the pres-
sure drain valve to relieve pressure. Clean the spray
tip as shown in manual 308–644, supplied with the
RAC IV.
TIP GUARD HANDLE
SHOWN IN SPRAYING
POSITION
TURN HANDLE 180 ,
DISENGAGE SAFETY
LATCH AND TRIGGER
GUN TO CLEAR CLOG
Fig. 6
GUN SAFETY
LATCH
SHOWN
ENGAGED
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