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Kubota M108X Troubleshooting

The Kubota M108X is a 4WD row-crop tractor. This model was manufactured between 2007 and 2009. The Kubota M108X tractor is powered by Kubota V3800 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 108 hp (80.5 kW).

The Kubota M108X is fitted with 2 transmission options: Intelli-Shift partial powershift transmission with 16 forward and 16 reverse gears, or Intelli-Shift Creeper transmission with 24 forward and 24 reverse gears. Max. travel speed - 21.4 mph (34.5 km/h), max. creeper speed - 0.7 mph (1.1 km/h). The open center hydraulic system includes a gear pump with a flow of 18.1 gal/min (68.5 l/min). The main relief pressure is 196 (2845 psi).

The Kubota M108X was equipped with a hydrostatic power steering, 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 84" (2130 mm) bucket and lift capacity to full height of 3085 lbs (1400 kg).

Engine Troubleshooting
Engine is not starting or hard starting
Clogged fuel filter element - Change filter element
Closed fuel cock - Open fuel on-off cock to inject fuel
Air in fuel system - Air-bleed fuel system
Clogged fuel injectors - Test fuel injectors and change if necessary
Faulty fuel injection pump - Replace or repair injection pump
Bad cylinder compression - Check and change damaged parts
Engine stops during operation
Engine is not warmed up to required temperature - Warm up the engine as required
Fuel lines leaking air - Tighten clamps, change faulty pipes
Bad fuel injection - Check and adjust
Fuel filter is clogged - Replace the filter element
Dirty or faulty injectors - Check fuel injectors and replace if required
Engine starts and immediately stalls
Fuel injection pump out of timing - Check and correct adjustments
Clogged fuel filter element - Service the filter
Fuel injector nozzles fault - Test injector nozzles and replace as required
Damaged fuel injection pump - Change pump or rebuild it
Dirty air cleaner - Replace or service air cleaner element
Engine stalls when idle
Wrong adjustment of low idle speed - Need to adjust idle speed
Fuel injection pump is defective - Repair or change injection pump
Damaged or clogged injector nozzles - Check and change nozzles as required
Valve clearance is out of adjustment - Check and adjust as required
Engine overheats
Lack of coolant in cooling system - Top up coolant. Any leaks must be repaired
Cooling system components are worn or system is clogged - Change faulty components or service cooling system
Low engine oil level - Fill the crankcase with engine oil
Fan belt is worn or belt tension is improper - Adjust correctly or install new belt
Defective or wrong type of thermostat - Test thermostat opening temperature, replace as required
Loss of engine power
Dirty or faulty injectors - Clean or replace fuel injectors
Fuel injection pressure is wrong - Adjust to proper pressure
Clogged air filter element - Service or change air filter
Oil filter is dirty - Service or replace engine oil filter
Diesel engine overloaded - Reduce load or shift to lower gear
Valve out of adjustment - Check and adjust
Incorrectly adjusted low idle speed - Test and adjust
Restricted fuel hoses or pipes - Fuel hoses and pipes must be clean
Low engine compression: Inlet or outlet valves are defective - Valves need to be replaced
Engine knocks or noises
Unadjusted fuel injection pump timing - Check and correct settings
Dirty or defective injector nozzles - Test injector nozzles and replace as required
Lack of engine oil - Check oil level and add oil as required
Engine is not fully warmed up - Warm up the engine
Worn crankshaft or main bearings - Crankshaft or bearings need to be replaced
Damaged or defective piston rings - Piston rings need to be replaced
Loose flywheel screws - Inspect the flywheel screws and tighten securely
High engine oil consumption
External oil leaks: Seals or gaskets are wearing excessively - Worn parts need to be replaced
Improper oil viscosity - Fill up with the proper oil viscosity
Piston rings are defective or worn - Piston rings need to be replaced
Valve guides or stems are damaged - Install new valves
Damaged cylinder liners or pistons - Check liners and pistons, change as required

Electrical System Troubleshooting
Battery cannot be charged
Battery is defective - Battery change required
Battery cable harness failure - Check battery electrical cable for defects, replace or repair
Loose or corroded battery terminals and cables - Tighten or service terminals and cables
Defective belt or improperly adjusted belt tension - Adjust belt tension properly or change belt
Starter motor cranks slow
Battery power is low - Battery needs to be recharged
Battery drains quickly - Service battery or replace it
Battery wiring harness damage - Inspect battery wiring for damage, replace or repair
Battery terminals and cables are loose or corroded - Tighten or service terminals and cables
Starter will not work
Low battery output - Battery is drained, recharge it
Discharged or worn battery - Battery needs to be recharged or replaced
Starter motor failure - Change or repair starter
Disconnected or incorrectly connected cables - Need to reconnect cables correctly

Transmission Troubleshooting
Hard shifts
Failure or improper clutch adjustment - Adjust or change the clutch
Gear shift linkage is damaged or loose - Replace or repair the shift linkage
Damaged or worn shift forks - Change the shift forks
Faulty parts in the gear shifting mechanism - Change faulty parts
Transmission oil pressure is low
Lack of transmission fluid supply - Check and refill the transmission fluid
Clogged transmission fluid filter element (if fitted) - Change or service the transmission fluid filter
Faulty relief valve - Change relief valve
Transmission makes noise
Damaged or worn bearings - Faulty bearings should be replaced
Lack of transmission fluid supply - Check transmission fluid level and add it as required
Contaminated transmission fluid - Transmission fluid must be changed
Improper backlash or damaged gears - Replace gears or adjust backlash properly
Shift forks are worn or damaged - Shift forks need to be replaced
External oil leaks
Worn gaskets or seals - Replace worn seal or gaskets
Cracked transmission housing - Housing needs to be replaced

Hydraulics Troubleshooting
Hydraulic system is too hot
Incorrect pressure in hydraulic system - Changing the system pressure
Main relief valve is faulty or misadjusted - Adjust or change relief valve
Dirty hydraulic fluid - The fluid must be changed
Air in hydraulic system - Check the suction line, pump seals, and fittings
Insufficient hydraulic fluid pressure
Lack of hydraulic fluid - Check and refill the hydraulic fluid
Hydraulic fluid filter element clogging - Clean the hydraulic filter or install new filter element
Hydraulic pump malfunction - Test pump flow rate and replace pump if required
Damaged or incorrect adjusted hydraulic spool valve - Change or adjust properly
Defective hydraulic cylinder - Inspect cylinder parts for wear or damage and replace if required
Hydraulic lines are leaking - Detect leaks in the system and fix it
Hitch cannot be raised or raising is too slowly
Not enough hydraulic oil in the system - Add oil to the hydraulic system
Cold hydraulic oil - Warm up the oil
Dirty hydraulic oil filter - Install a new hydraulic filter element
Defective hydraulic pump - Flow-rate hydraulic pump and replace pump if necessary
Main relief valve failure or incorrect setting - Adjust or change relief valve
Hydraulic spool valve block is faulty or out of adjustment - Adjust properly or replace
Defective hydraulic cylinder - Check cylinder components for damage or wear and change if necessary
Suction line is damaged or disconnected - Connect or replace
Hitch does not lower or lowers very slowly
Hydraulic spool valve is not set properly or defective - Change or set correctly
Faulty hydraulic cylinder - Check cylinder components for damage or wear and change if necessary
Damaged hitch rock shaft - Install a new shaft
Hitch has mechanical defects - Change defective or worn hitch components
Hitch jerks when lift or lower
Aeration in hydraulic system - Check the suction line, pump seals, and fittings
Hydraulic fluid is dirty - Hydraulic fluid change required
Hydraulic pump is faulty - Flow-rate pump and change pump if necessary
Hydraulic control valve is not set properly or defective - Change or adjust properly
Broken hydraulic cylinder - Check cylinder parts for wear or damage and replace if necessary

Steering System Troubleshooting
Steering is difficult
Steering column is defective or improperly assembled - Change steering column or assemble properly
Air enters in steering system - Bleed air from system
Incorrect toe-in - Check toe-in and correct
Improper tire pressure - Check the pressure and inflate tires as required
Steering pump stopped working - Repair or replace steering pump
Defective or worn hydrostatic steering unit - Inspect and replace as required
Steering cylinder damage - Repair or replace steering cylinder
Relief valve failure or sticking - Check relief valve and change if required
Steering fluid level low - Checking steering fluid level and add it if necessary
Oil leaks in the steering system - Tighten the steering line and hose joints
Excessive steering wheel play
Steering column coupling or shaft has maximum wear - Replace defective part
Hydrostatic steering unit is defective or worn - Replace or repair steering unit as required
Steering pump malfunction - Repair or replace steering pump
Worn or faulty steering linkage or tie-rod ends - Replace damaged part
Tractor is pulling to right or left
Tire pressure is not correct - Check tire pressure and inflate as required
Toe-in adjustment is incorrect - Adjust toe-in wheels properly
Steering linkage or tie-rod ends are worn - Replace failed component
Worn or defective hydrostatic steering unit - Change or repair steering unit if required
Steering cylinder damage - Repair or replace steering cylinder
Damaged or improperly adjusted or worn front hub bearings - Change or adjust the bearings properly



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