Hitachi EM 490 dimensions Prime the sprayer with paint, Install the spray tip and tip guard

OPERATION

ON/OFF SWITCH

PRESSURE CONTROL KNOB

TURN CCW TO

LOWER PRESURE

RAC IV DripLess	PRESSURE DRAIN VALVE
TIP GUARD and
SwitchTip

Fig 2

1.Prime the sprayer with paint.

a.Close the pressure drain valve.

b.Don't install the spray tip yet!

c.Put the suction tube into the paint container.

d.Turn the pressure adjusting knob all the way counterclockwise to lower the pressure

e.Disengage the gun safety latch.

f.Hold a metal part of the gun firmly against and aimed into a grounded metal waste container. See Fig 3. Squeeze the trigger and hold it open, turn the sprayer ON, and slowly increase the pressure setting until the sprayer starts. Keep the gun triggered until all air is forced out of the sys- tem and the paint flows freely from the gun. Re- lease the trigger and engage the gun safety latch.

NOTE: If the pump is hard to prime, place a container un- der the pressure drain valve and open the valve. When fluid comes from the valve, close it. Then disengage the gun safety latch and proceed as in Step 1f, above.

g.Check all fluid connections for leaks; relieve pres- sure before tightening connections.

2.Install the spray tip and tip guard

a.Be sure the gun safety latch is engaged.

b.Install the spray tip. If using the RAC IV, refer to manual 307±848, supplied with the gun, for in- stallation instructions.

3.Adjusting the spray pattern (Refer to Fig 4. )

a.Increase the pressure setting just until spray from the gun is completely atomized. To avoid exces- sive overspray and fogging, and to decrease tip wear and extend the life of the sprayer, always use the lowest possible pressure needed to get the desired results.

b.If more coverage is needed, use a larger tip rather than increasing the pressure.

c.Test the spray pattern. To adjust the direction of the spray pattern, engage the gun safety latch and loosen the retaining nut. Position the tip guard horizontally for a horizontal pattern or verti- cally for a vertical pattern. Then tighten the retain- ing nut.

		SPOTTY	GOOD
GROUND		PATTERN	FULL
	±		PATTERN
WIRE		INCREASE
		PRESSURE
	MAINTAIN FIRM
	METAL-TO-METAL
	CONTACT BETWEEN
	GUN AND GROUNDED
	METAL CONTAINER
Fig 3		Fig 4

10307-735