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Home / Farm Tractors / Kubota Tractors / Kubota M105X

Kubota M105X Troubleshooting

The Kubota M105X is a 4x4 (4WD) row-crop tractor. This model was manufactured from 2005 to 2007. The Kubota M105X tractor is powered by Kubota V3800-TI-E2 4-cycle 4-cylinder direct injection turbocharged diesel engine.

A 230 cubic inches (3.8L) engine has a cylinder bore of 3.94" (100 mm), piston stroke of 4.72" (120 mm), and rated power of 105 hp (78.3 kW). The Kubota M105X is fitted with two 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 speed (travel/creeper): 21.4 mph (34.5 km/h) and 0.7 mph (1.1 km/h). The open center hydraulic system includes a gear pump with a flow rate of 18.1 gpm (68.5 lpm). The main relief pressure is 196 bar (2845 psi). The Kubota M105X was equipped with a hydrostatic power steering system, hydraulic wet disc brakes, 13.6R24 front tires, and 18.4R34 rear tires. The wheelbase is 95.9" (2430 mm). The tractor is compatible with a Kubota LA1301S loader with maximum lift height of 143.3" (3630 mm).

Engine Troubleshooting
Engine doesn't start or starts hard
Dirty fuel filter element - Service the filter
Fuel supply valve is closed - Open fuel supply valve
Fuel-line is leaking air - Retighten clamps, replace defective pipes
Fuel injectors are clogged or faulty - Inspect fuel injectors and replace if necessary
Defective fuel injection pump - Repair or change injection pump
Engine has bad compression - Check cylinder block and change faulty parts
Engine stalls while running
Engine is not warmed up to the required temperature - Warm up the engine as required
There is air in the fuel system - Bleed the system
Fuel injection failed - Use correct settings
Fuel filter clogging - Service the filter
Dirty or faulty injectors - Test fuel injectors and change if necessary
Engine starts and stalls immediately
Timing of fuel injection pump is wrong - Check and correct adjustments
Fuel filter clogging - Replace the filter element
Fuel injector nozzles are defective or dirty - Install a new set of well-balanced nozzles
Fuel injection pump failure - Change pump or rebuild it
Clogged air cleaner - Service or replace the air cleaner
Engine stalls while idling
Too low idle RPM - Adjust low idle speed
Fuel injection pump failure - Repair or install new pump
Fuel injector nozzles are defective or dirty - Change injector nozzles
Incorrect valve clearance - Have it adjusted
Engine overheating
Engine coolant is insufficient - Fill radiator to proper level. Any leaks must be repaired
Cooling system parts are worn or system is clogged - Change faulty components or service cooling system
Engine oil insufficient - Add oil to the engine crankcase
Damaged fan belt or incorrect belt tension - Adjust belt tension properly or replace it
Thermostat is defective - Check and replace if required
Lack of engine power
Clogged or damaged injectors - Test fuel injectors and change if necessary
Fuel injection pressure is wrong - Test fuel injection pressure and adjust it correctly
Dirty air filter element - Install new filter element or replace it
Clogged oil filter - Clean or replace engine oil filter element
Diesel engine overloaded - Change to lower gear or reduce load
The valve clearance is not adjusted - Check and adjust
Wrong adjustment of low idle speed - Adjust low idle speed
Dirt in the fuel pipes or hoses - Clean fuel system pipes and hoses
Engine lost compression: Inlet or outlet valves are defective - Replace the valves
Engine knocks or noises
Timing of fuel injection pump is wrong - Fuel pump timing settings need to be corrected
Damaged or clogged injector nozzles - Install a new set of well-balanced nozzles
Engine oil level is low - Fill the crankcase with engine oil
Engine has not warmed up to recommended temperature - Warm up the engine
Main bearings or crankshaft wear - Worn parts replacement required
Defective or broken piston rings - Piston rings replacement required
Flywheel bolts are loose - Bolts need to be tightened
Diesel engine consuming too much oil
Oil leakage: Seals or gaskets are defective - New components need to be installed
Crankcase oil too light - Use correct viscosity oil
Piston rings are stuck or worn - Piston rings replacement required
Worn valve guides and valve stems - Replace defective valves
Scuffed cylinder liners or pistons - Inspect pistons and liners, replace as required


Electrical System Troubleshooting
Battery is not charging
Worn-out battery - Replace the battery
Damaged battery cable harness - Check electrical cables for damage, repair or replace
Loose or corroded terminals and cables - Terminals and cables need to be tightened or cleaned
Damaged belt or incorrectly adjusted belt tension - Adjust belt tension as required or replace belt
Starter motor turns slow
Low battery voltage - Battery is drained, charge it
Battery is draining quickly - Battery needs to be serviced or replaced
Bad battery wiring harness - Inspect wiring for malfunctions, replace or repair
Loose or corroded cables and terminals - Clean or tighten cables and terminals
Starter is not working
Low battery capacity - Recharge the battery
Discharged or faulty battery - Charge or change the battery
Starter motor failure - Starter should be replaced
Disconnected or incorrectly connected wiring harness - Inspect wiring harness and reconnect it as required

Transmission Troubleshooting
Hard shifts
Clutch is not adjusted or faulty - Adjust correctly or replace
Stuck or damaged gear shift linkage - Change or repair shift linkage
Bent or worn shift forks - Shift forks need to be changed
Gearshift mechanism is worn out - Repair or replace worn components if required
Transmission oil pressure is low
Oil level is insufficient - Add transmission oil as required
Transmission oil filter element is dirty (if fitted) - Change or clean the transmission oil filter
Relief valve is defective - Replace relief valve
Transmission makes noise
Bearings are worn or cracked - Replace the bearings
Not enough oil in transmission - Checking transmission oil level and add if necessary
Transmission oil contamination - Change transmission oil
Worn gears or improper backlash - Change worn gears or set backlash correctly
Damaged or worn shift forks - Replace the shift forks
External fluid leaks
Broken gaskets or seals - Change defective gaskets or seal
Transmission case is cracked - Replace case or transmission assembly


Hydraulics Troubleshooting
Hydraulic system overheated
The system pressure has not been corrected - Make the correct settings
Main relief valve is faulty or misadjusted - Adjust relief valve or change if required
Hydraulic fluid contamination - Change hydraulic fluid
Air in hydraulic system - Inspect the pump seals, suction line, and fittings
Low hydraulic fluid pressure
Hydraulic fluid level is low - Fill the hydraulic system with oil
Hydraulic oil filter clogging - Service or replace the hydraulic filter
Hydraulic pump is defective - Test the pump performance and change pump if required
Hydraulic spool valve is defective or set improper - Replace or adjust correctly
Hydraulic cylinder is broken - Check cylinder components for damage or wear and change if necessary
Hydraulic lines are leaking - Find leaks in the system and fix it
3-point hitch raises slowly or won't raise
Not enough hydraulic fluid in the system - Need to add fluid
Cold fluid in hydraulic system - Wait for fluid to warm up
Hydraulic oil filter is dirty - Clean the hydraulic filter or install new filter element
Hydraulic pump malfunction - Test pump performance and replace pump if necessary
Defective or misadjusted main relief valve - Set up or change the relief valve
Hydraulic spool valve is faulty or out of adjustment - Replace or adjust correctly
Broken hydraulic cylinder - Check the hydraulic cylinder parts for damage or wear and replace if necessary
Suction pipe is damaged or loose - Repair or change
Hitch can't drop or drops too slowly
Damaged or incorrect adjusted hydraulic spool valve - Set properly or replace
Hydraulic cylinder failure - Inspect the hydraulic cylinder components for damage or wear and change if required
Lift arm shaft is damaged - Install a new shaft
Hitch has mechanical defects - Replace defective or worn hitch components
Three-point hitch raises or lowers not smoothly
Aeration in hydraulic system - Inspect the pump seals, suction pipe, and fittings
Hydraulic oil contamination - Change the oil
Hydraulic pump not working - Test the pump flow rate and install new pump if required
Hydraulic control valve is not set properly or defective - Set properly or replace
Hydraulic cylinder malfunction - Inspect cylinder parts for wear or damage and replace if required

Steering System Troubleshooting
Steering wheel is difficult to turn
Steering column is broken or improperly installed - Steering column must be installed properly or replaced
Air in steering system - Air-bleed steering system
Not adjusted toe-in - Check toe-in and correct
Tires are improperly inflated - Inflate as necessary
Faulty steering pump - Check the hydraulic steering pump and change if necessary
Hydrostatic steering unit has wear or malfunction - Change or repair steering unit if required
Defective steering cylinder - Change or repair steering cylinder
Relief valve is stuck or worn - Check relief valve and change if required
Insufficient steering fluid - Fill up the steering fluid
Oil leakage in the steering system - Retighten joints of the hydraulic steering pipes and hoses
Excessive steering wheel play
Steering column shaft or coupling has maximum wear - Replace faulty part
Hydrostatic steering unit has wear or damage - Check and replace as required
Steering pump is worn - Steering pump needs to be repaired or replaced
Steering tie-rod ends or linkage are worn - Change failed component
Front wheels wander to left or right
Front tires are worn out - Install new tires
Incorrect toe-in adjustment - Check and adjust toe-in
Faulty or worn steering tie-rod ends or linkage - Replace failed component
Hydrostatic steering unit has wear or damage - Check and replace as required
Defective steering cylinder - Change or repair steering cylinder
Damaged or improperly adjusted or worn front hub bearings - Adjust correctly or replace bearings

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