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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
Engine stops at idle
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
Engine is overheated
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
Loss of engine power
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
Engine noises or knocks
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
Starter turns slow
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
Starter will not crank
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
Transmission makes noise
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
External oil leaks
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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