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AIRLESSCO Mustang 4850 - User Manual

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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

  • M
    Marcus SmithAug 17, 2025
    Why AIRLESSCO Paint Sprayer does not run at all?
    • M
      Michael HornAug 17, 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.
  • S
    Sherry BowersAug 25, 2025
    What to do if my AIRLESSCO Paint Sprayer won't shut off after reaching maximum pressure?
    • M
      mark91Aug 25, 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.
  • D
    Deborah WalkerSep 1, 2025
    How to troubleshoot basic electrical problems in AIRLESSCO Paint Sprayer?
    • G
      gonzalezrobinSep 1, 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.
  • J
    jameslopezNov 8, 2025
    Why is my AIRLESSCO Mustang 4850 Paint Sprayer pump output low?
    • K
      Kim DiazNov 8, 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 ...

Summary

Important Safety Instructions

Warnings

Grounding

Essential grounding procedures for electrical safety and preventing sparks.

Skin Injection Hazard

Critical hazards related to high-pressure fluid injection and safety precautions.

Fire and Explosion Hazard

Precautions against fire and explosion risks from flammable materials and static electricity.

Equipment Misuse Hazard

Dangers associated with improper operation, handling, and maintenance of the equipment.

Electric Shock Hazard

Risks of electric shock due to improper grounding, setup, or usage.

Toxic Fluid or Fumes Hazard

Personal Protective Equipment

Grounding

Pressure Relief Procedure

Setup

Startup

Operation

Spray Tip Installation

Clear Tip Clog

Maintenance

Troubleshooting

Mechanical;Fluid Flow

Diagnosing and resolving issues related to pump output and fluid flow.

Electrical

Diagnosing and resolving electrical issues preventing sprayer operation.

Wiring Diagrams

Technical Specifications

AIRLESSCO Mustang 4850 Specifications

General IconGeneral
TypeAirless Paint Sprayer
Max Pressure3300 PSI
Flow Rate0.54 GPM
Hose Length50 ft
Power SourceElectric
Voltage120V
Amperage15A
Pump TypePiston Pump
Hose Connection1/4 in

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