Graco Inc 309225W Spraying Techniques, Preventing Excessive Tip Wear, Adjusting Pressure

Models: 309225W

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Spraying Techniques

This sprayer is set up for most airless spraying applications. Details on tip selection, tip wear, coat thickness, etc. are provided on page 13.

Motor only runs when gun is triggered. Sprayer is designed to stop pumping when gun trigger is released.

Preventing Excessive Tip Wear

Spray should be atomized (evenly distrib- uted, no gaps at edges). Start at low pres- sure setting, increase pressure a little at a time until you see a good spray pattern, without tails.

Spray at lowest pressure that atomizes paint.

If maximum sprayer pressure is not enough for a good spray pattern, tip is too worn. See Reversible Spray Tip Selection Chart, page 14.

GOOD

SPRAYYPATTERN

TAILSGAPS

AT EDGES

PRESSURE

TOOOLOW

TIA

If tails persist when spraying at the highest pressure, a larger tip is needed or the material may need to be thinned.

Spraying Techniques

Adjusting Pressure

Align arrow on sprayer with function symbol on Pressure Control knob, page 11.

Turning knob to right (clockwise) increases pressure at gun.

Turning it left (counter-clockwise) decreases pressure.

Getting Started With Basic Techniques

Practice spraying on a piece of scrap or cardboard before you begin spraying.

Hold gun 12

 IN

 

 

 

in. (30 cm)

 

 

 

CM

 

 

 

from surface

 

 

 

 

and aim

even finish

 

 

 

straight at

 

 

 

 

surface. Tilt-

 

 

 

 

ing gun to

 

 

 

 

direct spray

thick

 

 

 

angle causes

 

 

 

 

an uneven

 

 

 

 

finish.

uneven

 

 

 

 

finish

 

 

 

 

thin

 

TIA

 

 

 

 

Flex wrist to

even finish

 

 

 

keep gun

 

 

 

 

pointed

 

 

 

 

straight. Fan-

 

 

 

 

ning gun to

 

 

 

 

direct spray at

 

 

 

 

angle causes

thin

thick

thin

 

uneven finish.

 

 

 

 

TIA

309225W

15

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Graco Inc 309225W specifications Spraying Techniques, Preventing Excessive Tip Wear, Adjusting Pressure