DeWalt DWMT70778 User Manual (English)

Questions and Answers:

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christine30Aug 17, 2025
What to do if my DeWalt Paint Sprayer is spitting, spraying irregularly, or fluttering?
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  Nicole MillerAug 17, 2025
  If your DeWalt Paint Sprayer is spitting, spraying irregularly, or fluttering, it could be due to several reasons. The fluid nozzle might be cracked or worn, or there could be a leak at the fluid nozzle's thread or the fluid needle. The needle packing might be worn out, or there might not be enough fluid in the cup. Alternatively, the vent hole in the container cover could be clogged. To resolve this, try the following: tighten or replace the fluid nozzle, tighten the fluid nozzle, tighten the compression nut assembly or replace the needle packing, fill the cup with more fluid, or clean out the vent hole.
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Whitney BrownAug 20, 2025
Why is my DeWalt DWMT70778 Paint Sprayer producing an unatomized or spattered spray?
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  vincenthernandezAug 20, 2025
  An unatomized or spattered spray from your DeWalt Paint Sprayer can occur if the material is too heavy, the air pressure is insufficient, the fluid pressure is too high, or there's dried material on the tip of the fluid nozzle or air jets of the air cap. You can try thinning the material or using a larger orifice fluid nozzle set, increasing the pressure to within limit, reducing the pressure, or cleaning the nozzle and air cap.
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anthonyrodriguezAug 22, 2025
What to do if my DeWalt Paint Sprayer material is leaking from the nozzle when the trigger is released?
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  Ashley TaylorAug 23, 2025
  If material is leaking from the nozzle of your DeWalt Paint Sprayer when the trigger is released, it could be due to a worn fluid needle, dried material in the tip of the nozzle, or a loose packing nut. Try replacing the fluid needle, cleaning the nozzle, or tightening the needle packing nut by turning it counterclockwise.
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Christopher JohnsonAug 25, 2025
Why is my DeWalt DWMT70778 gun splitting?
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  Amy CochranAug 26, 2025
  Gun splitting in your DeWalt Paint Sprayer is often due to air getting into the paint stream, similar to when the cup is running out of paint. To resolve this, check and tighten the fluid needle packing nut, tighten the fluid tip, check the fluid tip seat for damage, ensure proper gun-to-cup seating, and verify that the cup is correctly fastened to the gun.
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Erika PetersenAug 27, 2025
What to do if material is leaking from the fluid inlet of the cup on my DeWalt Paint Sprayer?
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  alexander22Aug 27, 2025
  If material is leaking from the fluid inlet of the cup on your DeWalt Paint Sprayer, it's likely due to a loose cup or foreign substances on or between the cup thread and fluid inlet. Try tightening and cleaning the cup, or replace it if necessary.
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Henry DavidAug 30, 2025
Why is my DeWalt DWMT70778 Paint Sprayer producing excessive fog?
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  Dana WilliamsAug 30, 2025
  Excessive fog from your DeWalt Paint Sprayer is often caused by air pressure that's too high for the viscosity of the fluid. To fix this, reduce the air pressure and/or open the fluid control knob.
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Nicholas LeeSep 1, 2025
What causes a split pattern in my DeWalt Paint Sprayer and how to fix it?
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  Dale DavisSep 2, 2025
  A split pattern in your DeWalt Paint Sprayer can be caused by air pressure that's too high for the material viscosity or by dirty or distorted air horn holes, or one of the air horn holes being completely obstructed. To address this, try the following: 1. Reduce the air pressure. 2. Turn the pattern control knob clockwise to decrease the fan width and turn the fluid needle adjusting nut counterclockwise to increase fluid flow. 3. Rotate the air cap 180 degrees to see if the pattern follows the air cap, indicating an issue with the air cap. 4. Clean and inspect the horn holes. If the horn holes are distorted, replacement is necessary.
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karen33Sep 4, 2025
What to do if my DeWalt DWMT70778 has a heavy top or bottom pattern?
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  Brittany SmithSep 4, 2025
  If your DeWalt Paint Sprayer is producing a heavy top or bottom pattern, it's likely due to a dirty or damaged air cap or fluid tip. Rotate the air cap 180 degrees. If the pattern follows the air cap, clean and inspect it; replacement may be necessary. If the pattern doesn’t follow the air cap, clean and inspect the fluid tip for dried paint, dirt, or damage; replacement may also be necessary.
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Jonathan BurgessSep 6, 2025
What causes inadequate air delivery in my DeWalt DWMT70778 Paint Sprayer and how can I fix it?
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  Jeffrey DurhamSep 6, 2025
  Inadequate air delivery in your DeWalt Paint Sprayer can be caused by a partially closed air needle, dried material in the air jets or air cap, or an obstruction in the air line. To fix this, open the control knob, clean the air jets and air cap, and remove any obstruction in the air line.
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fodomSep 9, 2025
How to fix air back pressuring into the cup of my DeWalt DWMT70778 Paint Sprayer?
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  David HaynesSep 9, 2025
  If air is back pressuring into the cup of your DeWalt Paint Sprayer, it's likely due to excessive air blowing back into the cup. Try tightening the fluid tip, checking the fluid tip seat, and inspecting for any damage to the fluid seat on the tip or the seat on the gun head.