Graco LineLazer III 3900 User Manual (English)

Other manuals for Graco LineLazer III 3900

Questions and Answers:

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Gary MercerAug 23, 2025
Why won't my Graco Paint Sprayer engine start?
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  jonesjeffreyAug 23, 2025
  If your Graco Paint Sprayer engine won’t start, first, ensure the engine switch is in the ON position. Check if the engine is out of gas and refill the tank if necessary. 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. If the engine is cold, use the choke. Ensure the fuel shutoff lever is in the ON position. If oil is seeping into the combustion chamber, remove the spark plug, pull the starter 3 to 4 times, clean or replace the spark plug, and start the engine, keeping the sprayer upright to prevent oil seepage.
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Raymond WallerAug 25, 2025
How to fix fluid spitting from Graco Paint Sprayer gun?
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  Christopher MyersAug 25, 2025
  If your Graco Paint Sprayer is spitting fluid from the gun, start by checking and tightening all fluid connections and reprime the pump. Clear the tip if it is partially clogged. Refill the fluid supply if it is low or empty, and prime the pump, checking the fluid supply often to prevent running the pump dry.
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jjonesAug 25, 2025
What causes excessive paint leakage in my Graco Paint Sprayer throat packing nut?
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  Brandi RobertsAug 26, 2025
  If you have excessive paint leakage into the throat packing nut of your Graco Paint Sprayer, remove the throat packing nut spacer and tighten the throat packing nut just enough to stop the leakage. If the throat packings are worn or damaged, replace them. Also, replace the displacement rod if it is worn or damaged.
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ariana73Aug 28, 2025
Why is my Graco Paint Sprayer pump difficult to prime?
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  Barbara EllisonAug 29, 2025
  If your Graco Paint Sprayer pump is difficult to prime, check and tighten all fluid connections. Reduce engine speed and cycle the pump as slowly as possible during priming. Clean the intake valve, ensuring the ball seat is not nicked or worn and that the ball seats well, then reassemble the valve. Replace the pump packings if they are worn. If the paint is too thick, thin it according to the supplier’s recommendations. Decrease the throttle setting before priming the pump if the engine speed is too high.
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Jennifer TranAug 31, 2025
How to troubleshoot distance counter on Graco Paint Sprayer?
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  April HarveyAug 31, 2025
  If your Graco Paint Sprayer distance counter is not operating properly, first refer to the section on "Spray icon does not show on display when fluid is sprayed" for trigger sensor setting instructions. Check the wiring connections and reconnect if necessary. Adjust the space between the distance sensor and gear to .050 --/+ .020”. Remove the tire and press in or pull out the gear to align the sensor and gear if they are not aligned. Replace the distance gear/wheel if the gear teeth are missing or damaged. Replace the sensor if the wire is cracked or broken.
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sanchezjenniferSep 1, 2025
Why is the gallon counter not working on my Graco Paint Sprayer?
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  jacobfloresSep 1, 2025
  If your Graco Paint Sprayer gallon counter is not working, check the wires and connections, replacing any broken wires. Replace the sensor if it is bad. If the magnet is missing, replace it and locate it in the correct spot.
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Sara HernandezSep 2, 2025
What to do if Graco Paint Sprayer operates, but display doesn't?
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  Michael JohnsonSep 2, 2025
  If your Graco Paint Sprayer operates, but the display does not, remove the display and reconnect it to address a bad connection between the control board and the display. If the display is damaged, replace it.
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shannon97Sep 3, 2025
How to adjust high engine speed at no load on Graco Paint Sprayer?
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  christine63Sep 3, 2025
  If your Graco Paint Sprayer has high engine speed at no load, reset the throttle to 3700 engine rpm at no load if the throttle setting is misadjusted. Replace or service the engine governor if it is worn.
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peter00Sep 4, 2025
Why does my Graco Paint Sprayer clutch squeak when engaging?
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  Sherry RobinsonSep 4, 2025
  If the clutch squeaks each time it engages on your Graco Paint Sprayer, it may be because the clutch surfaces are new and not yet matched to each other, causing noise. The noise will dissipate after a day of run time as the surfaces wear into each other.
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Jessica WalkerSep 5, 2025
Why won't my Graco LineLazer III 3900 engine start?
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  Judy TorresSep 6, 2025
  If your Graco Construction Equipment engine won’t start, there are several potential causes: * The engine switch might be OFF: Turn the engine switch ON. * The engine might be out of gas: Refill the gas tank. * The engine oil level might be low: Replenish oil, if necessary. * The spark plug cable might be disconnected or damaged: Connect the spark plug cable or replace the spark plug. * The engine might be cold: Use the choke. * The fuel shutoff lever might be OFF: Move the lever to the ON position. * Oil might be seeping into the combustion chamber: Remove the spark plug, pull the starter 3 to 4 times, clean or replace the spark plug, and start the engine. Keep the sprayer upright to avoid oil seepage.