Major MJ71-400 User Manual (English)

Questions and Answers:

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Thomas PetersonAug 15, 2025
Why does my Major MJ71-400 Lawn Mower leave a streak of uncut grass?
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  Michele RileyAug 15, 2025
  If your Major Lawn Mower leaves a streak of uncut grass, several factors could be the cause. The blades might be dull or bent, requiring replacement. The carrier RPM could be too low, so ensure you're using the correct PTO speed. If the ground speed is too fast, reduce it by shifting to a lower gear. In case the grass is down from previous weather conditions, mow in only one direction. Also, check for any build-up of materials under the machine and clean it. Finally, ensure the blades are mounted correctly with the cutting edge facing the correct rotation.
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Randall WrightAug 18, 2025
What to do if the gearbox on my Major MJ71-400 is overheating?
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  Deborah EspinozaAug 19, 2025
  If the gearbox on your Major Lawn Mower is overheating, there are a few things to check. First, ensure the lubricant level is adequate and fill to the proper level if it's low. Also, make sure you're using the correct type of lubricant; if not, replace it. Additionally, remove any excessive grass or debris build-up around the gearbox. Lastly, ensure that the PTO isn't running too fast and lower the RPM rate if needed.
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Robert BoydAug 22, 2025
Why does my Major MJ71-400 Lawn Mower discharge material unevenly?
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  Debbie CainAug 22, 2025
  If your Major Lawn Mower discharges material unevenly, creating bunches along the swath, it could be due to a couple of reasons. If the material is too high and there's too much of it, reduce your ground speed while maintaining the recommended RPM at the tractor PTO, or make two passes over the material, raising the machine for the first pass and lowering it to the desired height for the second pass, cutting at a 90-degree angle to the first pass. If the grass is wet, allow it to dry before mowing, slow down the tractor's ground speed while keeping the engine running at full PTO RPM, and consider cutting lower.
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heathercastanedaAug 26, 2025
How to fix excessive vibration in my Major MJ71-400 Lawn Mower?
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  Bonnie JohnsonAug 26, 2025
  If your Major Lawn Mower is experiencing excessive vibration, check the following: 1. Tighten any loose gearbox bolts. 2. Tighten any loose nuts on the blades. 3. Replace any broken blades in a set. 4. Ensure that new blades or bolts are not mixed with worn ones; replace in sets if necessary. 5. Phase the driveline, ensuring implement and tractor yokes are in line; replace if necessary.
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Joseph ParkerAug 28, 2025
Why does my Major Lawn Mower require excessive power?
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  Briana AlvarezAug 28, 2025
  If your Major Lawn Mower requires excessive power, it might be due to advancing into grass too rapidly, so reduce your forward travel speed. Also, check if the machine is hitting the ground and raise it, resetting the wheels. Finally, inspect the blades for wear or dullness; sharpen or replace them as needed.
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Joshua NelsonSep 1, 2025
How to troubleshoot a noisy Major MJ71-400?
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  Timothy DunnSep 1, 2025
  If your Major Lawn Mower is noisy, start by checking the oil level in the gearbox and add oil if it's low. Ensure all bolts are fully tightened. Verify the PTO RPM rate and adjust as needed. Replace any bent or missing blades. Check that the PTO shaft is aligned correctly and that the output shaft on the gearboxes is not bent. Also, check the driveline between gearboxes is aligned.
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Brent Johnson Jr.Sep 4, 2025
Why do the blades on my Major Lawn Mower wear too fast?
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  doris39Sep 4, 2025
  Blades on your Major Lawn Mower might wear too fast if you're cutting in sandy or rocky conditions; increase the cutting height. Also, ensure the blades aren't hitting the ground and increase the cutting height to prevent this.
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hannah85Sep 7, 2025
What causes a gearbox leak in my Major MJ71-400 Lawn Mower?
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  Phillip SmithSep 8, 2025
  If the gearbox on your Major Lawn Mower is leaking, several issues could be the cause. A damaged oil seal is a common culprit, so replace the seal. If the shaft is bent or rough in the oil seal area, replace or repair the shaft and replace the oil seal. Ensure the oil seal is installed correctly; if not, replace it. If the oil seal isn't sealing in the housing, replace the seal or use a sealant on the outside diameter. Also, check that the oil level isn't too high and drain it to the proper level if needed. Inspect the gearbox for holes or a damaged gasket, and replace the gearbox or gasket as necessary. Finally, tighten any loose bolts.
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Gina ReynoldsSep 12, 2025
What to do if my Major MJ71-400 Lawn Mower blade is scalping the ground?
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  Jeffery EspinozaSep 12, 2025
  If the blade of your Major Lawn Mower is scalping the ground, it could be because the machine is set too low; raise the machine and reset the wheels. If the field is ridged, try cutting it at a different angle. If the field is too wet, stop and wait until it has dried.