OPERATION

1.Prime the sprayer with paint.

a.Close the pressure drain valve. See Fig 10±2.

b.Don't install the spray tip yet!

c.Put the suction tube into the paint container. You can hang the pail on the pail hanger. See Fig 10±2.

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

e.Disengage the trigger safety latch. See the detail in Fig 10±2.

f.Hold a metal part of the gun firmly against a grounded metal waste container. See Fig 10±1. Hold the trigger open, turn the sprayer ON, and slowly increase the pressure until the sprayer starts. Keep the gun triggered until all air is forced out of the system and the paint flows freely from the gun. Release the trigger and engage the trig- ger safety latch.

NOTE: If the pump is hard to prime, open the pressure drain valve. When fluid comes through the drain tube, close the drain valve. Disengage the trigger safety latch and repeat Step 1.f.

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

GROUND

WIRE

MAINTAIN FIRM

METAL-TO-METAL

CONTACT BETWEEN

GUN AND GROUNDED

METAL CONTAINER

Fig 10±1

0664

 

2.Install the spray tip and tip guard.

a.Be sure the trigger 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.

PACKING NUT/WETCUP

PAIL HANGER

DRAIN TUBE

SUCTION TUBE

ON/OFF SWITCH

PRESSURE ADJUSTING KNOB

PRESSURE DRAIN VALVE

DETAIL

TIP GUARD

SPRAY TIP

TRIGGER SAFETY LATCH SHOWN ENGAGED (ON SAFE)

10307-724

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Graco Inc EM390 instruction manual Prime the sprayer with paint, Install the spray tip and tip guard