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Home / Farm Tractors / Kubota Tractors / Kubota M126X

Kubota M126X Troubleshooting

The Kubota M126X is a 4-wheel drive row crop tractor. This model was manufactured between 2009 and 2014. The Kubota M126X tractor is powered by 373.7 cu.in (6.1 L) Kubota V6108-TI-CRS 4-cylinder direct injection turbocharged intercooled diesel engine with a rated output power of 126 hp (94 kW).

The Kubota M126X is fitted with two types of transmission. 1st type: Intelli-Shift partial powershift transmission with 16 forward and 16 reverse gears. 2nd type: Intelli-Shift Creeper transmission with 24 forward and 24 reverse gears. The maximum travel speed - 22.5 mph (36.3 km/h), maximum creeper speed - 0.7 mph (1.1 km/h). The open center hydraulic system used a gear pump with rated fluid flow of 20.4 gpm (77.7 lpm). The hydraulic system pressure is 196 bar (2845 psi).

The tractor is equipped with a hydrostatic power steering, hydraulic wet disc brakes, 14.9R24 or 420/70R24 front tires, and 18.4R38 or 520/80R38 rear tires. The wheelbase is 105.9" (2680 mm). The Kubota M126X is compatible with Kubota LA2253 loader with a 84" (2130 mm) bucket and lift capacity to full height of 4877 lbs (2212 kg).

Engine Troubleshooting
Engine won't start or difficult to start
Fuel filter is clogged - Change filter element
No fuel injection - Open fuel cock to inject fuel
There is air in the fuel system - Bleed the system
Fuel injectors are damaged or dirty - Check fuel injectors and replace if required
Fuel injection pump damage - Repair or install a new fuel pump
Bad compression - Inspect cylinder block and change damaged parts
Engine stalls during operation
Coolant temperature is low - Warm up the engine as required
Air in fuel pipes - Bleed fuel pipes
Improper fuel injection - Fuel injection settings required
Fuel filter is dirty - Clean the filter element
Clogged fuel injectors - Clean or replace fuel injectors
Engine starts and immediately stops
Unadjusted fuel injection pump timing - Fuel injection pump timing adjustment needs to be corrected
Fuel filter is clogged - Service or replace the filter
Fuel injector nozzles fault - Service or replace injector nozzles
Fuel injection pump is damaged - Repair or install new pump
Air cleaner element is dirty - Replace cleaner or install new cleaner element
Engine stalls when idle
Low idle speed setting is not correct - Correct low idle adjustment
Faulty fuel injection pump - Repair or change injection pump
Clogged or damaged injector nozzles - Install a new set of well-balanced nozzles
Valve clearance is out of adjustment - Adjust valve clearance according to specifications
Engine overheats
Insufficient coolant - Refill to the correct level. Check radiator and hoses for leaks
Cooling system is dirty or cooling components are failed - Change faulty components or flush the cooling system
Engine oil level low - Fill up the engine oil
Improper fan belt tension or damaged belt - Adjust belt tension correctly or replace it
Defective or wrong type of thermostat - Check and replace if required
Engine power loss
Fuel injectors are defective or dirty - Inspect fuel injectors and replace if necessary
Fuel injection pressure is wrong - Repair or replace injection pump
Dirty air filter - Change or service air filter element
Engine oil filter is plugged - Clean or replace engine oil filter element
Engine is overloaded - Change to lower gear or reduce load
Valve out of adjustment - Check and adjust
Wrong adjustment of low idle speed - Normalize low idle speed
Fuel hoses or pipes clogging - Fuel pipes and hoses need to be cleaned
Engine compression too low: Intake or exhaust valves are damaged - Have valves replaced
Engine knocking or noise
Fuel injection pump out of timing - Fuel injection pump timing adjustment needs to be corrected
Fuel injector nozzles are defective or dirty - Replace fuel injector nozzles
Insufficient engine oil - Fill up the oil to required level
Engine is not fully warmed up - Warm up engine as required
Crankshaft or main bearings failure - Crankshaft or bearings need to be replaced
Piston rings are worn or broken - Piston rings replacement required
Flywheel bolts are loose - Bolts need to be tightened
Engine using too much oil
External oil leaks: Gaskets or seals may be damaged - Replace defective parts
Oil viscosity is incorrect - Fill up with the proper oil viscosity
Seized or wear piston rings - Replace piston rings
Damaged valve stems or valve guides - Valves need to be changed
Worn cylinder liners or pistons - Inspect liners and pistons, fit new parts as necessary


Electrical System Troubleshooting
Battery will not charge
Worn-out battery - Replace the battery
Battery cable harness damage - Check battery cables for damage, change or repair
Loose or corroded battery terminals and cables - Service or tighten battery terminals and cables
Improper belt tension adjustment or damaged belt - Replace belt or adjust belt tension correctly
Starter cranks slow
Low battery output - Low battery charging, charge as required
Battery will not hold charge - Service charging system or install new battery
Bad battery cable harness - Inspect cables for malfunctions, repair or change
Battery cables and terminals are loose or corroded - Service or tighten battery cables and terminals
Starter will not work
Low battery power - Recharge the battery
Discharged or faulty battery - Recharge or replace battery
Starter motor is defective - Starter should be replaced
Disconnected or incorrectly connected wiring harness - Inspect wiring harness and reconnect it as required

Transmission Troubleshooting
Hard to shift gears
Worn or incorrectly adjusted clutch - Adjust clutch or replace if required
Gear shift linkage is loose or broken - Repair or change shift linkage
Shift forks are damaged or worn - Replace the shift forks
Faulty parts in the gear shifting mechanism - Change faulty parts
Insufficient transmission oil pressure
Low transmission oil level - Fill the transmission housing to proper oil level
Transmission fluid filter clogging (if fitted) - Change or clean the transmission fluid filter
Faulty relief valve - Install a new relief valve
Transmission is excessively noisy
Bearings are worn or cracked - Replace the bearings
Lack of transmission fluid supply - Fill the transmission housing with fluid
Dirty transmission oil - Transmission oil must be changed
Incorrect backlash or gears are defective - Replace gears or set backlash correctly
Damaged or worn shift forks - Change defective shift forks
Transmission fluid leaking
Seals or gaskets are damaged - Replace worn gaskets or seal
Cracked transmission housing - Housing needs to be replaced


Hydraulics Troubleshooting
Excessive hydraulic system heat
Improper hydraulic system pressure setting - Set the pressure properly
Main relief valve is defective or unadjusted - Adjust the valve or replace if necessary
Contaminated hydraulic oil - Change hydraulic oil
Hydraulic system sucks air - Inspect the pump seals, suction pipe, and fittings
Insufficient hydraulic oil pressure
Hydraulic oil level is insufficient - Fill up the hydraulic oil
Hydraulic oil filter clogging - Clean or replace the hydraulic filter
Hydraulic pump is defective - Check the pump performance and replace it if required
Defective or not adjusted hydraulic control valve - Adjust properly or replace
Defective hydraulic cylinder - Check the hydraulic cylinder parts for damage or wear and replace if necessary
Hydraulic piping leaks - Inspect hydraulic system for leaks and repair it
3-point hitch won't raise or raises slowly
Lack of hydraulic oil - Fill the hydraulic system with oil
Hydraulic fluid is too cold - Allow fluid to warm
Hydraulic oil filter clogging - Service or replace the hydraulic filter
Defective hydraulic pump - Test pump performance and replace pump if necessary
Main relief valve is damaged or adjusted improperly - Adjust or change relief valve
Damaged or incorrect adjusted hydraulic control valve - Adjust properly or change
Faulty hydraulic cylinder - Check cylinder components for damage or wear and change if necessary
Broken or loose suction line - Retighten or change
Hitch does not lower or lowers very slowly
Hydraulic spool valve is faulty or out of adjustment - Replace or adjust properly
Faulty hydraulic cylinder - Check cylinder parts for wear or damage and replace if necessary
Worn hitch cross shaft - Replace the shaft
Internal mechanical failure of the hitch - Change worn or defective hitch components
Hitch is lowered or raised jerkily
Hydraulic system sucks air - Check the pump seals, suction line, and fittings
Hydraulic oil contamination - Change the oil
Faulty hydraulic oil pump - Check hydraulic pump flow and replace pump if necessary
Hydraulic spool valve is defective or set improper - Adjust correctly or change
Hydraulic cylinder failure - Check cylinder parts for wear or damage and replace if necessary

Steering System Troubleshooting
Steering wheel turns hard
Steering column is damaged or incorrectly assembled - Steering column must be assembled correctly or changed
Aeration in steering system - Bleed air from system
Improper toe-in adjustment - Check and adjust toe-in
Deflated front tyres - Inflate tyres as needed
Damaged hydraulic steering pump - Check the steering pump and replace if necessary
Hydrostatic steering unit has wear or damage - Inspect and replace as required
Relief valve failure or seizing - Replace or service relief valve
Steering fluid level is low - Check fluid level and add steering fluid as required
Steering system oil leak - Retighten joints of the hydraulic steering pipes and hoses
Excessive play in steering
Steering column shaft or coupling has maximum wear - Replace defective component
Worn or defective hydrostatic steering unit - Repair or replace the steering unit
Defective hydraulic steering pump - Replace or repair steering pump
Steering linkage or tie-rod ends are defective - Replace damaged part
Tractor is pulling to left or right
Tire pressure is improper - Inflate the tires properly
Incorrect toe-in adjustment - Adjust toe-in wheels properly
Faulty or worn steering tie-rod ends or linkage - Replace damaged component
Damaged or worn hydrostatic steering unit - Replace or repair steering unit as required
Steering cylinder failure - Repair or replace hydraulic steering cylinder
Front hub bearings are improperly adjusted or defective - Adjust correctly or replace bearings

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