AIRLESSCO MP400 - Manual (Page 13)

Operation
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Clearing Clogs
1. Release trigger. Engage trigger lock. Rotate Spray
Tip. Disengage trigger lock. Trigger gun at waste
area to clear clog.
2. Engage trigger lock. Return Spray Tip to original
position. Disengage trigger lock and continue
spraying.
Adjusting the Pressure
When adjusting the pressure, turn the Pressure Control
Knob clockwise to increase pressure and counterclock-
wise to decrease pressure. Always use the lowest pres-
sure necessary to completely atomize the material. If
more coverage is needed, use a larger tip rather than
increasing the pressure.
NOTE: Operating the sprayer at higher pressure than
needed wastes material, causes early tip wear, and
shortens sprayer life.
NOTE: Check the spray pattern. The tip size and angle
determines the pattern width and flow rate.
Shutdown
1. Relieve Pressure, page 10.
2. Clean the tip and gun as recommended in the sepa-
rate Gun Manual supplied with the gun.
3. If spraying water-based material or a material that
could harden in the sprayer overnight, flush the
sprayer after use. See Flushing, page 11.
Storage
Short Term
1. Flush sprayer with compatible solvent before stor-
ing, then fill the pump and hoses with an oil based
solvent such as mineral spirits.
• For oil base paint: flush with mineral spirits
• For water-base paint: flush with water, then min-
eral spirits and leave the pump, hose and gun
filled with mineral spirits.
Long Term
For longer storage, use Graco Pump Armor or mineral
spirits. Shut off sprayer, Relieve Pressure, page 10,
and make sure prime valve is left open.
Start Up After Storage
Before using water-base paint, flush sprayer with soapy
water and then a clean water flush. When using oil-base
paint, flush out the mineral spirits with the material to be
sprayed.
NOTE: Always store unit indoors.
To reduce the risk of injection, never hold your hand,
body, fingers or hand in a rag in front of the spray tip
when cleaning or checking for a cleared tip. Always
point the gun toward the ground or into a waste con-
tainer when checking to see if the tip is cleared or
when using a self cleaning tip.
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