Kubota M5-091 User Manual (English)

Questions and Answers:

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Amy FarmerAug 8, 2025
Why is my Kubota M5-091 engine difficult to start?
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  bmcdowellAug 8, 2025
  If your Kubota Tractor engine is difficult to start or won't start, several factors could be at play. First, ensure there's adequate fuel flow by checking the fuel tank and filter, replacing the filter if needed. Air or water in the fuel system can also cause this; tighten the fuel line coupler bolt and nut, and bleed the fuel system. In cold weather, use appropriate oil viscosities or consider using an engine block heater. Weak battery can be another cause. Clean the battery cables and terminals, charge the battery, and in very cold conditions, remove, charge, and store the battery indoors, installing it only when you're ready to use the tractor. Also, check the intake air heater system by examining the slow blow fuse and ensuring the heater functions correctly in cold weather.
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Dawn Johnson MDAug 17, 2025
Why are the exhaust fumes from my Kubota Tractor colored?
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  fernando31Aug 17, 2025
  If the exhaust fumes from your Kubota Tractor are colored, the cause depends on the color. If they're black, it could be due to poor fuel quality, too much oil, or a clogged air cleaner. In this case, change the fuel and fuel filter, check the oil level, and clean or replace the air filter element. If the fumes are blue-white, it might be because the exhaust muffler is damp with fuel, there's an issue with the injection nozzle, or the fuel quality is poor. Check the intake air heater function in cold weather, heat the muffler by applying load to the engine, inspect the injection nozzle, and change the fuel and fuel filter.
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Dustin DavisAug 28, 2025
Why does my Kubota Tractor have insufficient engine power?
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  Mark PerryAug 28, 2025
  If your Kubota Tractor engine lacks sufficient power, it could be due to insufficient or dirty fuel, so check the fuel system. Another potential cause is a clogged air cleaner; in this case, clean or replace the element. Also, make sure that DEF/AdBlue® tank is full, add DEF/AdBlue® if necessary.

Kubota M5-091 Specifications

General

Engine Horsepower	91 HP
Hydraulic System	Open center
PTO Speed	540/540E
Tire Size (Front)	9.5-24
Tire Size (Rear)	16.9-30
Engine	Kubota Diesel
Ground Clearance	15.2 inches