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Graco LineLazer II 3900 - User Manual

Graco LineLazer II 3900
30 pages
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308874
Rev. N
First choice when
quality counts.t
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Spray Tip *. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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* for spray tip selection see page 4.
All models are not available in all countries
PATENTS PENDING
8824A
Model 232651
INSTRUCTIONS–REPAIR
INSTRUCTIONS
KEEP FOR REFERENCE.
Read this and all related manuals for
important warnings and instructions.
LineLazer II 3900 and 5900
3300 psi (230 bar, 23 MPa ) Maximum Working Pressure
LineLazer II 3900
Model Series Description
232651 A Complete Sprayer
232652 A Complete Sprayer with 2nd Gun Kit
233011 A Complete Sprayer with Gauge and
Pail Kit
233012 A Complete Sprayer with 2nd Gun Kit,
Gauge and Pail Kit
LineLazer II 5900
Model Series Description
232661 A Complete Sprayer
232662 A Complete Sprayer with 2nd Gun Kit
233013 A Complete Sprayer with Gauge and
Pail Kit
233014 A Complete Sprayer with 2nd Gun Kit,
Gauge and Pail Kit
Table of Contents
Component Identification and Function 3. . . . . . . . . . . .
Spray Tip Selection Guide 4. . . . . . . . . . . . . . . . . . . . . . .
Maintenance 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Troubleshooting 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Repair
Bearing Housing & Connecting Rod 8. . . . . . . . . . . . .
Drive Housing 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Pinion Assembly/Rotor/Field/Shaft/Clutch 10. . . . . . .
Clamp 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Clutch Housing 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Engine 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Pressure Control 14. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Displacement Pump 16. . . . . . . . . . . . . . . . . . . . . . . . .
Parts
Model 232651, 232661 LineLazer II 17. . . . . . . . . . . .
Pinion Assembly 25. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Complete Sprayers 28. . . . . . . . . . . . . . . . . . . . . . . . . .
Pressure Control 27. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Dimensions 29. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Technical Data 29. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Graco Warranty 29. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Graco Phone Number 29. . . . . . . . . . . . . . . . . . . . . . . . . .
GRACO INC. P.O. BOX 1441 MINNEAPOLIS, MN 55440–1441
ECOPYRIGHT 1999, GRACO INC.
Graco Inc. is registered to I.S. EN ISO 9001

Table of Contents

Other manuals for Graco LineLazer II 3900

Preview: Instructions-Repair
Instructions-Repair28 pages
Preview: Quick Start Guide
Quick Start Guide2 pages

Questions and Answers

  • S
    Samuel SmithAug 17, 2025
    How to troubleshoot a Graco LineLazer II 3900 Paint Sprayer engine that won't start?
    • J
      John JeffersonAug 17, 2025
      If your Graco Paint Sprayer engine won't start, first ensure the engine switch is in the ON position. If that doesn't work, check if the engine is out of gas and refill the tank. Also, verify the engine oil level and replenish if low. Inspect the spark plug cable for disconnections or damage, and connect or replace it as needed. For a cold engine, use the choke. Confirm that the fuel shutoff lever is in the ON position. If oil is seeping into the combustion chamber, remove the spark plug, pull the starter rope several times, clean or replace the spark plug, and keep the sprayer upright.
  • R
    Richard FrenchAug 20, 2025
    Why won't my Graco Paint Sprayer engine start?
    • M
      Misty ClayAug 20, 2025
      Your Graco Paint Sprayer engine may not start due to several reasons. Ensure the engine switch is ON. Check if the engine is out of gas and refill if needed. Verify the engine oil level and replenish if low. Make sure the spark plug cable is connected and not damaged; replace the spark plug if necessary. If the engine is cold, use the choke. Also, confirm the fuel shutoff lever is in the ON position. If oil is seeping into the combustion chamber, remove the spark plug, pull the starter rope a few times, clean or replace the spark plug, and keep the sprayer upright.
  • M
    Matthew BurkeAug 22, 2025
    How to prime Graco Paint Sprayer if it is difficult?
    • J
      Julie CoxAug 23, 2025
      If your Graco Paint Sprayer is difficult to prime, check for air in the pump or hose by tightening all fluid connections. Reduce engine speed and cycle the pump slowly during priming. Inspect the intake valve for leaks, ensuring the ball seat isn't damaged and the ball seats well after cleaning and reassembling the valve. Also, if the paint is too thick, thin it according to the supplier’s recommendations. Decreasing the throttle setting before priming the pump can also help.
  • C
    Cristina HarrisAug 25, 2025
    Why is fluid spitting from the gun of my Graco LineLazer II 3900?
    • I
      iriceAug 26, 2025
      If fluid is spitting from the gun of your Graco Paint Sprayer, it could be due to air in the pump or hose. Check and tighten all fluid connections and reprime the pump. Another reason could be a partially clogged tip, so clear the tip. Also, ensure the fluid supply isn't low or empty, and refill if necessary, priming the pump afterward. Check the fluid supply often to prevent the pump from running dry.
  • J
    Joshua MirandaAug 28, 2025
    What to do if paint leaks into the wetcup of my Graco Paint Sprayer?
    • M
      Mike BarberAug 28, 2025
      If paint leaks into the wetcup of your Graco Paint Sprayer, first try tightening the wetcup just enough to stop the leakage. If the leak persists, the throat packings may be worn or damaged, or the displacement rod may be worn or damaged.
  • C
    Crystal BoyerAug 30, 2025
    What to do if fluid delivery is low on my Graco Paint Sprayer?
    • J
      Jennifer MckenzieAug 30, 2025
      If the fluid delivery is low on your Graco Paint Sprayer, check the following: * Ensure the inlet screen isn't clogged and clean it if necessary. * Increase the pressure setting. * Increase the engine throttle setting. * Check the fluid filter, tip filter, and tip for clogs or dirt and clean them. * If you're using heavy materials, a larger diameter hose and/or shorter hose length might be needed. Avoid using more than 100 ft of 1/4 in. hose; use 3/8 in. hose for best performance (minimum 50 ft).
  • C
    Cynthia ChapmanSep 2, 2025
    What causes low pump output on upstroke of my Graco Paint Sprayer?
    • J
      jenniferfrancoSep 2, 2025
      Low pump output on the upstroke of your Graco Paint Sprayer could be due to a clogged hose inlet screen, so clean the inlet screen. It could also be that the piston ball is not seating. Another potential cause is worn or damaged piston packings, or a worn or damaged O-ring in the displacement pump.
  • E
    Evan RobertsSep 5, 2025
    What to do if the Graco LineLazer II 3900 Paint Sprayer engine runs but the displacement pump doesn't operate?
    • R
      raymondryanSep 5, 2025
      If the Graco Paint Sprayer engine operates but the displacement pump does not, first ensure that the pressure control switch is turned ON. Then, check the pressure setting and increase it by turning the pressure adjusting knob clockwise. Inspect the fluid filter for dirt and clean if necessary. Also, verify that the tip or tip filter isn't clogged and clean it if needed.
  • R
    robert17Sep 7, 2025
    What to do if the engine of my Graco Paint Sprayer operates, but the displacement pump does not operate?
    • A
      Aimee LopezSep 8, 2025
      If your Graco Paint Sprayer's engine runs but the displacement pump doesn't, first ensure the pressure control switch is ON. Then, check if the pressure setting is too low and increase it by turning the pressure adjusting knob clockwise. Also, check the fluid filter and tip/tip filter for any clogs. The displacement pump piston rod may be stuck due to dried paint.
  • H
    Holly BallardSep 12, 2025
    What causes low pump output on downstroke or both strokes of my Graco LineLazer II 3900 Paint Sprayer?
    • P
      Paul McmillanSep 12, 2025
      Low pump output on the downstroke or both strokes of your Graco Paint Sprayer can be caused by a clogged hose strainer, so clean the strainer screen. It may also be caused by worn or damaged piston packings. Another potential cause is the intake valve ball not seating properly. Also, ensure the engine speed isn't too low by increasing the throttle setting. A worn or damaged clutch can also cause this issue.

Graco LineLazer II 3900 Specifications

General IconGeneral
BrandGraco
ModelLineLazer II 3900
CategoryPaint Sprayer
LanguageEnglish

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