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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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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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| Farm Tractors Technical Specifications |
