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Kubota M125X Troubleshooting
The
Kubota M125X is a 4WD row crop tractor. This model was manufactured from 2005 to
2008. The Kubota M125X tractor is powered by 355.9 cu.in (5.8L) Kubota F5802-TE2
four-cycle five-cylinder direct injection turbocharged liquid-cooled diesel
engine with a rated power of 125 hp (93.2 kW).
The Kubota M125X is fitted with 2 transmission options: Intelli-Shift
partial powershift transmission with 16 forward and 16 reverse gears,
and Intell-Shift Creeper transmission with 24 forward and 24 reverse
gears. The maximum forward/reverse speed (travel/creeper) - 21.4 mph
(34.5 km/h) / 0.7 mph (1.1 km/h). The open center hydraulic system
includes a gear pump with a rated capacity of 20 gpm (75.7 lpm). The
hydraulic pressure is 196 bar (2845 psi).
The Kubota M125X is equipped with a hydrostatic power steering system,
hydraulic wet disc brakes, standard cab with heat and air-conditioning,
14.9R24 or 13.6x24 front tires, and 18.4R38 or 16.9x38 rear tires. The
wheel base is 105.9 in (2680 mm). The tractor is compatible with a
Kubota LA1601S loader with lift capacity to max height of 3858 lbs (1749
kg) and breakout force of 6110 lbs (2771 kg).
| Engine Troubleshooting |
| Engine is not starting or hard starting |
| Fuel filter is clogged - Filter maintenance required |
| Closed fuel supply valve - Open supply valve to inject fuel |
| Air trapped in fuel system - Bleed air |
| Fuel injectors are damaged or dirty - Inspect fuel injectors and replace if necessary |
| Fuel injection pump is not working correctly - Rebuild or replace pump |
| Engine has low compression - Check cylinder block and replace damaged components |
| Engine shuts off while driving |
| Coolant temperature is low - Warm up engine as required |
| Air in fuel pipes - Bleed fuel pipes |
| Bad fuel injection - Check and adjust |
| Clogged fuel filter element - Replace filter element |
| Faulty or dirty injectors - Clean or replace fuel injectors |
| Engine starts but immediately shuts off |
| Fuel injection pump timing is incorrect - Adjust the fuel injection pump timing correctly |
| Clogged fuel filter element - Service the filter |
| Fuel injector nozzles are damaged - Service or replace nozzles if required |
| Fuel injection pump malfunctioning - Install a new pump or rebuild |
| Dirty air cleaner - Air cleaner maintenance required |
| Incorrect low idle setting - Correct low idle settings |
| Fuel injection pump is broken - Install a new pump or rebuild |
| Fuel injector nozzles are damaged - Change injector nozzles |
| Valve out of adjustment - Adjustment procedure required |
| Low coolant level - Fill the radiator to the required level. Check system for leaks |
| Cooling system is dirty or cooling components are failed - Flush cooling system or replace faulty parts |
| Engine oil level low - Add oil to the engine crankcase |
| Worn fan belt or improper belt tension - Adjust belt tension correctly or replace it |
| Defective thermostat - Install new thermostat |
| Fuel injectors are defective or dirty - Test fuel injectors and change if necessary |
| Fuel injection pressure is incorrect - Correct the pressure settings |
| Air filter element clogging - Service or change air filter |
| Oil filter element is dirty - Replace or service engine oil filter |
| Engine overload - Reduce the load or operate the tractor in lower gears |
| Improper valve clearance - Check and adjust |
| Low idle speed set incorrectly - Correct low idle settings |
| Fuel hoses or pipes clogging - Service fuel hoses and pipes |
| Engine losing compression: Intake or exhaust valves are damaged - Valve replacement required |
| Timing of fuel injection pump is not adjusted - Fuel pump timing settings need to be corrected |
| Clogged or defective injector nozzles - Check and change nozzles as required |
| Engine oil insufficient - Check and refill engine oil |
| Low coolant temperature - Warm up the engine to required temperature |
| Main bearings or crankshaft wear - Crankshaft or bearings need to be replaced |
| Piston rings are damaged or broken - Have piston rings replaced |
| Loose flywheel screws - Inspect the flywheel screws and tighten securely |
| Engine using too much oil |
| External oil leaks: Seals or gaskets are defective - To repair leaks, replace worn parts |
| Oil viscosity is incorrect - Fill up with the proper oil viscosity |
| Piston rings are seized or worn - Change the piston rings as required |
| Worn valve stems and valve guides - Install new valves |
| Cylinder liners or pistons are worn - Inspect pistons and liners, change as required |
| Electrical System Troubleshooting |
| Battery does not charge |
| Battery dead cell - Use a new battery |
| Bad battery cable harness - Inspect cables for malfunctions, repair or change |
| Corroded or loose cables and terminals - Cables and terminals must be tightened or cleaned |
| Worn belt or improperly adjusted belt tension - Change belt or adjust belt tension properly |
| Battery voltage is low - Battery is drained, recharge it |
| Battery discharges quickly - Service charging system or replace battery |
| Bad battery cable harness - Inspect cables for malfunctions, repair or change |
| Loose or corroded cables and terminals - Tighten or service cables and terminals |
| Low battery voltage - Low battery charging, charge as required |
| Discharged or worn battery - Need to charge or replace the battery |
| Starter motor failing - Starter needs to be replaced |
| Battery cables are disconnected or incorrectly connected - Check cables and reconnect it correctly |
| Transmission Troubleshooting |
| Difficult to shift gears |
| Worn or misadjusted clutch - Adjust or replace the clutch |
| Gear shift linkage is loose or broken - Replace or repair the shift linkage |
| Damaged or worn shift forks - Change defective shift forks |
| Gearshift mechanism failure - Change or repair failed components |
| Insufficient transmission oil pressure |
| Oil level is insufficient - Check transmission oil level and add oil as required |
| Transmission oil filter element is dirty (if fitted) - Replace or service transmission oil filter |
| Relief valve is faulty - Replace the valve |
| Bearings are worn or cracked - Install new bearings |
| Fluid level is low - Check transmission fluid level and add it as required |
| Transmission fluid contamination - Fill up with fresh transmission fluid |
| Incorrect backlash or gears are defective - Replace gears or set backlash correctly |
| Damaged or worn shift forks - Replace defective shift forks |
| Gaskets or seals are broken - Change defective gaskets or seal |
| Cracked transmission case - Install a new transmission case |
| Hydraulics Troubleshooting |
| Excessive hydraulic system heat |
| System pressure has not been adjusted correctly - Pressure needs to be adjust correctly |
| Main relief valve failure or incorrect setting - Set up or change the relief valve |
| Hydraulic fluid is dirty - Hydraulic fluid change required |
| Air leaks in hydraulic system - Inspect the suction pipe, fittings, and pump seals |
| Insufficient hydraulic oil pressure |
| Lack of hydraulic oil - Fill the hydraulic system with oil |
| Hydraulic oil filter clogging - Service the hydraulic filter or change if required |
| Hydraulic pump is defective - Test the pump flow rate and install new pump if required |
| Hydraulic spool valve is not set properly or defective - Replace or adjust correctly |
| Hydraulic cylinder is broken - Inspect cylinder components for damage or wear and change if required |
| Hydraulic lines are leaking - Inspect hydraulic system for leaks and repair it |
| Hitch fails to lift or lifts slowly |
| Hydraulic fluid level is insufficient - Need to add fluid |
| Cold hydraulic oil - Warm up the oil |
| Dirty hydraulic oil filter - Hydraulic filter maintenance required |
| Damaged hydraulic oil pump - Test pump flow rate and replace pump if required |
| Main relief valve is defective or unadjusted - Set up or change the relief valve |
| Hydraulic control valve block is not set properly or defective - Replace or adjust correctly |
| Hydraulic cylinder is defective - Check cylinder components for wear or damage and change if necessary |
| Suction line is damaged or disconnected - Connect or replace |
| Hitch won't lower or lowers slowly |
| Damaged or incorrect adjusted hydraulic spool valve - Replace or set properly |
| Hydraulic cylinder is broken - Inspect cylinder parts for wear or damage and replace if required |
| Worn lift arm shaft - Change the shaft |
| The hitch has any internal mechanical damage - Replace worn or damaged hitch components |
| Hitch jerks when lower or lift |
| Air leaks in hydraulic system - Inspect the suction line, pump seals, and fittings |
| Contaminated hydraulic fluid - Change hydraulic fluid |
| Hydraulic pump is defective - Test the pump flow rate and install new pump if required |
| Hydraulic control valve block is defective or set improper - Replace or set correctly |
| Faulty hydraulic cylinder - Check cylinder parts for wear or damage and replace if necessary |
| Steering System Troubleshooting |
| Steering is stiff |
| Defective or incorrectly installed steering column - Reinstall the steering column or change it |
| Air enters in steering system - Bleed the steering system |
| Not adjusted toe-in - Adjust toe-in properly |
| Low tire pressure - Inflate the tires |
| Hydraulic steering pump is defective - Install a new hydraulic steering pump |
| Damaged or worn hydrostatic steering unit - Check and replace as required |
| Relief valve is seized or defective - Inspect relief valve and replace if necessary |
| Low steering fluid level - Fill the steering system with fluid |
| Oil leakage in the steering system - Retighten steering hose and line connections |
| Excessive free play of steering wheel |
| Worn steering column shaft or coupling - Replace defective component |
| Hydrostatic steering unit is worn or defective - Repair or change the steering unit |
| Hydraulic steering pump is defective - Repair or replace steering pump |
| Faulty or worn steering tie-rod ends or linkage - Replace failed component |
| Front wheels wander to left or right |
| Incorrect tire pressure - Inflate the tires correctly |
| Improper toe-in adjustment - Check toe-in and correct |
| Steering linkage or tie-rod ends are defective - Change failed part |
| Hydrostatic steering unit has wear or malfunction - Replace or repair steering unit as required |
| Steering cylinder damage - Repair or replace steering cylinder |
| Incorrectly adjusted or worn front hub bearings - Adjust properly or change bearings |
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| Farm Tractors Technical Specifications |
