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AIRLESSCO MP 455 - User Manual

AIRLESSCO MP 455
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3A4180C
EN
Operation/Repair/Parts
Electric Airless Sprayers
For professional use only.
Not approved for use in explosive atmospheres or hazardous locations.
For the application of architectural paints and coatings.
MP 455, Mustang 4850 Models:
3300 psi (22.7 MPa, 227 bar) Maximum Working Pressure
Important Safety Instructions
Read all warnings and instructions in this manual and in related manuals.
Be familiar with the controls and the proper usage of the equipment.
Save these instructions.
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Related Manuals:
3A4133 Gun
3A4347 Pump
www.graco.com/techsupport
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Table of Contents

Questions and Answers

  • T
    Taylor FordAug 19, 2025
    Why AIRLESSCO MP 455 Paint Sprayer does not run at all?
    • A
      Andrea MillerAug 20, 2025
      If your AIRLESSCO Paint Sprayer isn't running, first, verify that there is appropriate AC voltage (100-130V for 110-120VAC models or 210-255V for 230VAC models). Next, check the pressure control connections to ensure they are clean and firmly connected. You can also test the pressure control by connecting a known good one; if the motor then runs, replace the original pressure control. Also, with the sprayer unplugged, check the replaceable fuse for continuity. Finally, confirm that the motor leads are clean and firmly connected.
  • C
    courtney01Aug 27, 2025
    What to do if my AIRLESSCO MP 455 Paint Sprayer won't shut off after reaching maximum pressure?
    • H
      Haley DyerAug 27, 2025
      If your AIRLESSCO Paint Sprayer continues to run after reaching maximum pressure, the pressure control might be the issue. Try disconnecting the pressure control. If the sprayer stops, replace the pressure control. However, if the sprayer continues to run even with the pressure control disconnected, the control board needs to be replaced.
  • A
    Audrey WoodSep 3, 2025
    How to troubleshoot basic electrical problems in AIRLESSCO Paint Sprayer?
    • A
      Alexander WarnerSep 3, 2025
      To troubleshoot basic electrical issues with your AIRLESSCO Paint Sprayer: * Ensure motor leads are securely fastened and properly mated, replacing loose terminals and cleaning circuit board terminals. * Tighten terminal screws for loose motor brush lead connections, replacing brushes if leads are damaged. * Replace brushes if they are less than 1/2 in. [13mm]. * Replace broken motor brush springs or realign misaligned ones. * Clean brush holders to ensure free vertical brush movement. * If the motor armature commutator has burn spots, gouges, or extreme roughness, have a motor shop resurface it.
  • B
    Bill RogersNov 11, 2025
    Why is my AIRLESSCO MP 455 pump output low?
    • K
      Katrina JohnsonNov 11, 2025
      Low pump output on your AIRLESSCO Paint Sprayer can stem from several causes. The spray tip may be worn or clogged, requiring replacement or cleaning after pressure relief. The paint supply might be depleted, necessitating a refill and pump repriming. A clogged intake strainer should be removed, cleaned, and reinstalled. Problems may arise if the intake valve ball and piston ball aren't seating properly; in this case, remove and clean the intake valve, inspect the balls and seats for damage, and replace if needed, remembering to strain paint to prevent future clogs. A clogged fluid or tip filter needs cleaning. A leaking prime valve should be repaired after pressure relief. Ensure the pump isn't stroking when the gun trigger is released; if it is, service the pump. Leaks around the throat ...

AIRLESSCO MP 455 Specifications

General IconGeneral
ModelMP 455
TypeAirless Paint Sprayer
Max Pressure3300 PSI
Max Flow Rate0.54 GPM
Hose Length50 ft
Voltage120V
Flow Rate0.54 GPM
MotorDC Motor
Max Tip Size0.021 inches
Horsepower0.8 hp
Amperage7 A
Tip Size Range0.009-0.021 inch

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