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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 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 |
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 |
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 |
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 |
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 |
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 |
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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Farm Tractors Technical Specifications |