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Kubota M135X Troubleshooting

The Kubota M135X row crop tractor was manufactured between 2009 and 2014. This model was designed in two versions: M135XDTC (Standard front axle) and M135XDTSC (Front axle suspension). The Kubota M135X tractor is powered by Kubota V6108-TI-CRS 4-cycle 4-cylinder direct injection turbocharged diesel engine. A 373.7 cubic inches (6.1L) engine has a cylinder bore of 4.65" (118 mm), piston stroke of 5.51" (140 mm), and rated power of 135 hp (100.7 kW).

The Kubota M135X 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. Max travel speed - 22.5 mph (36.3 km/h), max creeper speed - 0.7 mph (1.1 km/h). The open center hydraulic system used a gear pump with fluid flow rate of 20.4 gal/min (77.7 l/min). The hydraulic pressure is 196 bar (2845 psi).

The Kubota M135X was equipped with a hydrostatic power steering, hydraulic wet disc brakes, 14.9R24 or 420/70R24 front tires, and 18.4R38 or 520/80R38 rear tires. The wheelbase is 105.9" (2680 mm). The tractor is compatible with a Kubota LA1601S loader with lift capacity to max height of 4877 lbs (2212 kg) and breakout force of 6398 lbs (2902 kg).

Engine Troubleshooting
Diesel will not start or hard to start
Fuel filter is dirty - Service or replace the filter
No fuel injection - Open fuel cock to inject fuel
Air in fuel pipes - Bleed fuel pipes
Dirty or damaged injectors - Change fuel injectors
Fuel injection pump malfunction - Rebuild or change fuel pump
Poor cylinder compression - Inspect cylinder block and change damaged parts
Engine stalls during operation
Engine is cold - Warm up engine as required
Air in fuel pipes - Bleed fuel pipes
Fuel injection failed - Use correct settings
Clogged fuel filter element - Service the filter
Clogged or damaged injectors - Clean or replace fuel injectors
Diesel starts but then shuts off
Incorrectly set fuel injection pump timing - Check and correct settings
Dirty fuel filter element - Clean or replace the filter
Damaged or clogged injector nozzles - Check and change nozzles as required
Defective fuel injection pump - Rebuild or install a new injection pump
Dirty air cleaner - Air cleaner maintenance required
Engine stops when idling
Wrong adjustment of low idle speed - Correct low idle adjustment
Fuel injection pump damage - Rebuild or install a new injection pump
Dirty or defective injector nozzles - Install new set of properly balanced nozzles
Excessive valve clearance - Have it adjusted
Engine overheats
Lack of coolant in cooling system - Coolant needs to be refilled. Check for leaks or other malfunctions
Cooling system is clogged or cooling parts are defective - Replace faulty parts or service cooling system
Lack of engine oil - Checking oil level and add if necessary
Fan belt is defective or belt tension is not adjusted - Adjust belt tension correctly or replace it
Thermostat fault - Install new thermostat
Engine power is reduced
Fuel injectors are damaged or dirty - Clean or replace fuel injectors
Incorrect fuel injection pressure - Check the fuel injection pressure and adjust if necessary
Clogged air filter - Replace or service air filter element
Plugged engine oil filter - Clean or replace engine oil filter element
Engine is running overloaded - Shift to lower gear or reduce the load
Valve clearance is wrong - Correct valve clearance
Incorrect low idle speed adjustment - Normalize low idle speed
Restricted fuel pipes or hoses - Service fuel hoses and pipes
Lack of compression: Valves are faulty or leaking - Replace the valves as required
Abnormal engine knocking or noise
Fuel injection pump timing is incorrect - Adjust injection timing
Fuel injector nozzles are damaged - Service or replace injector nozzles
Lack of engine oil - Fill the crankcase with engine oil
Engine is not warmed up to the required temperature - Warm up the engine
Crankshaft or main bearings failure - Need to install new components
Piston rings failure - Replace piston rings
Loose flywheel screws - Check the flywheel screws and tighten as required
High engine oil consumption
Oil leaking: Seals or gaskets are defective - Change to repair leaks
Improper oil viscosity - Fill up with the proper oil viscosity
Piston rings are stuck or worn - Piston rings replacement required
Valve stems and guides are worn - Valves must be replaced
Damaged pistons or cylinder liners - Inspect pistons and liners, replace as required

Electrical System Troubleshooting
Battery will not charge
Faulty cell in battery - Battery replacement required
Battery wiring harness damage - Inspect battery wiring for damage, replace or repair
Corroded or loose terminals and cables - Tighten or clean terminals and cables
Incorrect belt tension adjustment or worn belt - Adjust belt tension properly or change belt
Starter motor turns slow
Low battery capacity - Battery is drained, recharge it
Battery is draining quickly - Service battery or change it
Damaged battery cable harness - Check electrical cables for damage, repair or replace
Battery cables and terminals are loose or corroded - Tighten or clean terminals and cables
Starter is not cranking
Battery power is low - Charge the battery
Drained or defective battery - Charge or change the battery
Starter motor is damaged - Starter should be replaced
Improperly connected or disconnected cables - Check battery cables and connect properly

Transmission Troubleshooting
Hard shifts
Clutch is unadjusted or worn - Replace or adjust clutch
Loose or broken gear shift linkage - Change defective shift linkage
Bent or worn shift forks - Replace the shift forks
Gearshift mechanism is worn out - Repair or replace worn components if required
Transmission oil pressure is insufficient
Not enough oil in transmission - Fill up the transmission oil
Clogged transmission fluid filter element (if fitted) - Change or clean the transmission fluid filter
Faulty relief valve - Replace relief valve as required
Transmission is making noise
Bearings are worn or damaged - Faulty bearings should be changed
Fluid level is low - Add transmission fluid as required
Dirty transmission fluid - Change transmission fluid
Worn gears or improper backlash - Replace gears or set backlash correctly
Bent or worn shift forks - Replace defective shift forks
Transmission oil leakage
Worn gaskets or seals - Install new components
Transmission housing is cracked - Replace housing or transmission assembly

Hydraulics Troubleshooting
Hydraulic system is overheated
System pressure has not been adjusted correctly - Pressure needs to be adjust correctly
Main relief valve failure or incorrect setting - Adjust or change relief valve
Hydraulic oil is contaminated - Fill up with fresh hydraulic oil
Air leaks in hydraulic system - Check the suction line, pump seals, and fittings
Hydraulic oil pressure is low
Hydraulic oil level is low - Fill up the hydraulic oil
Hydraulic fluid filter is dirty - Replace hydraulic filter element or service if necessary
Hydraulic pump failure - Test pump performance and replace pump if necessary
Defective or not adjusted hydraulic spool valve - Adjust properly or replace
Hydraulic cylinder is defective - Inspect cylinder components for wear or damage and change if required
Hydraulic lines are leaking - Identify leaks in the system and repair it
3-point hitch won't raise or raises slowly
Hydraulic fluid level is low - Need to add fluid
Hydraulic oil is too cold - Allow oil to warm
Hydraulic oil filter element clogging - Clean or change hydraulic filter
Hydraulic pump is faulty - Test pump performance and replace pump if necessary
Main relief valve malfunction or incorrect adjustment - Adjust relief valve or change if required
Hydraulic spool valve block is defective or set improper - Set properly or replace
Faulty hydraulic cylinder - Check cylinder components for wear or damage and change if necessary
Loose or damaged suction line - Tighten or replace
Hitch drops too slowly or can't drop
Hydraulic control valve is defective or set improper - Adjust correctly or change
Hydraulic cylinder is faulty - Inspect the hydraulic cylinder parts for damage or wear and replace if required
Hitch rock shaft is worn Install a new shaft
Mechanical parts of the hitch are damaged - Change worn or damaged hitch parts
Hitch lower or lift is jerky
Air enters in hydraulic system - Check the suction pipe, fittings, and pump seals
Hydraulic oil contamination - Change the oil
Hydraulic pump is faulty - Test the pump flow rate and install new pump if required
Hydraulic control valve is faulty or out of adjustment - Adjust correctly or replace
Faulty hydraulic cylinder - Check cylinder components for wear or damage and change if necessary

Steering System Troubleshooting
Steering is hard
Steering column is broken or improperly installed - Steering column must be installed properly or replaced
Air leaks in steering system - Air-bleed steering system
Improper toe-in adjustment - Adjust toe-in properly
Tires are not properly inflated - Inflate tires as required
Steering pump failure - Steering pump needs to be repaired or replaced
Worn or defective hydrostatic steering unit - Inspect and change as required
Relief valve sticking or malfunction - Clean or change the relief valve
Steering fluid level is insufficient - Add oil to steering system
Oil leaks in the steering system - Retighten steering hose and line connections
Steering wheel free play is excessive
Worn steering column shaft or coupling - Replace defective part
Worn or defective hydrostatic steering unit - Replace or repair steering unit as required
Steering pump is worn - Replace or repair steering pump
Worn or faulty steering linkage or tie-rod ends - Replace damaged part
Front wheels wander to left or right
Deflated front tyres - Inflate tyres as needed
Incorrect toe-in - Check toe-in and correct
Worn or faulty steering tie-rod ends or linkage - Change failed part
Hydrostatic steering unit is damaged or worn - Replace or repair steering unit as required
Defective steering cylinder - Replace or repair steering cylinder
Front hub bearings are damaged or incorrectly adjusted - Change or adjust bearings correctly



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