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AIRLESSCO LP 400 - User Manual

AIRLESSCO LP 400
34 pages
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For application of architectural paints and coatings. For professional use only. Not
approved for use in European explosive atmosphere locations.
3000 psi (20.7 MPa, 207 bar) Maximum Working Pressure
For model information, see page 2.
Related Manuals
Important Safety Instructions
Read all warnings and instructions in this manual. Save these instructions.
Gun Manual
312363 - English
312364 - Spanish
312365 - French
Operation/Repair/Parts
LP 400/500/600/700
Mustang 5100/8100
Airless Paint Sprayer
3A1185H
EN

Table of Contents

Questions and Answers

  • S
    Shannon PowersAug 13, 2025
    What to do if my AIRLESSCO Paint Sprayer primes but has no pressure?
    • D
      Derek CooperAug 13, 2025
      If your AIRLESSCO Paint Sprayer primes but has poor or no pressure, try the following: * Ensure the pressure isn't set too low by turning it up. * Clean or replace the gun filter, inlet filter, and/or manifold filter if they are clogged. * Service the outlet valve if it's fouled or worn. * Clean or replace the prime/pressure relief valve (866428) if it's bypassing. * Tighten the packing nut or repack the unit if the packings and/or piston are worn.
  • D
    David WoodwardAug 17, 2025
    How to fix an AIRLESSCO Paint Sprayer that doesn’t prime?
    • H
      Holly LaneAug 17, 2025
      If your AIRLESSCO Paint Sprayer unit doesn’t prime, it could be due to several reasons: * Tighten the suction nut to resolve air leaks. * Replace the o-ring (108526) on the suction seat and the o-ring (867370) below the suction seat if they are worn and causing air leaks. * Replace the suction hose if there's a hole causing an air leak. * Service the inlet and outlet valves if the balls are stuck or fouled.
  • J
    Jonathan DeanAug 20, 2025
    Why AIRLESSCO Paint Sprayer does not maintain good spraying pressure?
    • S
      stewartmichaelAug 20, 2025
      If your AIRLESSCO Paint Sprayer does not maintain good spraying pressure, consider these solutions: * Replace the spray tip if it's blown. * Repack the unit if the packings and/or pistons are worn. * Replace the upper seat if it is worn.
  • D
    Daniel ReillyAug 25, 2025
    What to do if my AIRLESSCO Paint Sprayer machine does not start?
    • E
      Erin RodriguezAug 25, 2025
      If your AIRLESSCO Paint Sprayer machine does not start, ensure the machine is plugged into the wall. Check that the on-off switch is in the ON position and the pressure control knob is turned all the way to the right (clockwise for maximum pressure). If the power indicating light is still out after checking these settings and the power source, replace the pressure control assembly.
  • A
    Abigail CarrollAug 28, 2025
    How to fix AIRLESSCO LP 400 unit that does not run?
    • J
      Jeff ColeAug 28, 2025
      If your AIRLESSCO Paint Sprayer unit does not run, replace the fuse with a 20A Slow Blow fuse (331328).
  • K
    Kelly MillerSep 1, 2025
    How to troubleshoot the pressure control knob (potentiometer) on my AIRLESSCO Paint Sprayer?
    • D
      Danielle VargasSep 1, 2025
      If the AIRLESSCO Paint Sprayer doesn't start, plug another potentiometer (POT) into the control board. If the machine starts, the old POT is faulty. If a replacement POT isn't available, remove the POT lead (with the machine turned off) from the control board and test the resistance between the red and black wires (test at the plug). The resistance should be between 8-12k ohms; replace the POT if it's outside this range. If there is DC voltage at the motor brushes and the sensor and pressure control knob are functioning, replace the pressure control assembly.
  • T
    Teresa BoltonSep 4, 2025
    How do I troubleshoot the motor on my AIRLESSCO Paint Sprayer?
    • M
      Maria MillerSep 4, 2025
      To troubleshoot the motor of your AIRLESSCO Paint Sprayer, remove the motor brush covers and turn the machine ON. Set the potentiometer (POT) at maximum pressure and check for DC voltage across both brush terminals; it should read greater than 80 volts DC. If you have DC voltage, turn the machine off, unplug it, and check that the brushes are making good contact with the armature. Replace the brushes if they are less than 1/2” long; if the brushes are good, replace the motor. If you do not have DC voltage, see Sensor troubleshooting.
  • G
    Glenda ConnerSep 9, 2025
    How do I troubleshoot the sensor on my AIRLESSCO LP 400?
    • H
      Haley GeorgeSep 9, 2025
      To troubleshoot the sensor on your AIRLESSCO Paint Sprayer, plug another sensor board into the board and perform the zero calibration procedure. If the machine starts to run, the sensor is defective. If there is no replacement sensor available, use a multi-meter to test the resistance across the red and black wires of the sensor (be sure to test the plug). You should read 1.5 - 3.5k ohms. A faulty sensor usually reads no continuity (open). If the sensor passes all the tests, see Pressure Control Knob (Potentiometer) troubleshooting.

AIRLESSCO LP 400 Specifications

General IconGeneral
TypeAirless Paint Sprayer
Max Pressure3000 psi
Max. Working Pressure3000 psi
Flow Rate0.54 GPM
MotorElectric
Weight49 lbs
Hose Length50 ft
Voltage120 V
Amperage15 A
Spray Tip Size0.015" - 0.019"

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