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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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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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| Farm Tractors Technical Specifications |
