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Kubota M6131 Troubleshooting

The Kubota M6-131 utility tractor was manufactured between 2015 and 2018. The Kubota M6131 driveline consists of Kubota V6108-TI-CRS four-stroke four-cylinder turbocharged intercooled diesel engine and 24x24 Intelli-Shift partial powershift transmission. A 374 cubic inches (6.1 L) engine has a cylinder bore of 4.65" (118 mm), piston stroke of 5.51" (140 mm), and rated power of 123.2 hp (91.9 kW). The maximum forward speed - 22.7 mph (36.6 km/h), maximum reverse speed - 22.9 mph (36.9 km/h).

The closed center hydraulic system includes a piston pump with rated fluid flow of 20.4 gpm (77.2 lpm). The hydraulic system pressure is 200 bar (2900 psi). The Kubota M6-131 is equipped with a hydrostatic power steering, hydraulic wet disc brakes, 14.9R24 front tires, and 18.4R38 rear tires. The wheelbase is 105.9 in (2680 mm). The tractor is compatible with Kubota LA2255 front-end loader with a lift capacity to full height of 4711 lbs (2136 kg) and breakout force of 6585 (2986 kg).

Engine Troubleshooting
Engine doesn't start or hard to start
Fuel filter is dirty - Replace filter element
Fuel supply valve is closed - Open fuel supply valve
Air in fuel system - Air-bleed fuel system
Faulty or dirty injectors - Test fuel injectors and change if necessary
Defective fuel injection pump - Rebuild or change fuel pump
Bad cylinder compression - Inspect cylinder block and change worn parts
Diesel shuts off during operation
Coolant temperature is low - Warm up the engine
Air in fuel lines - Bleed fuel lines
Improper fuel injection - Fuel injection settings required
Dirty fuel filter element - Install new filter element
Clogged or damaged injectors - Check fuel injectors and replace if required
Engine starts but then shuts off
Fuel injection pump out of timing - Adjust the fuel injection pump timing correctly
Plugged fuel filter - Replace the filter element
Fuel injector nozzles are dirty - Service or replace nozzles if required
Fuel injection pump is broken - Change pump or rebuild it
Dirty air cleaner element - Replace cleaner or install new cleaner element
Engine stops when idle
Low idle speed adjustment is incorrect - Need to adjust idle speed
Faulty fuel injection pump - Repair or replace injection pump
Fuel injector nozzles are damaged - Change injector nozzles
Valve clearance is not correct - Check and adjust as required
Engine overheating
Low engine coolant - Add the coolant. Check radiator and hoses for leaks
Cooling system parts are failed or system is dirty - Replace faulty parts or flush the cooling system
Not enough engine oil - Check and refill engine oil
Broken fan belt or unadjusted belt tension - Replace or adjust belt tension properly
Thermostat failure - Check and change if necessary
Diesel engine is losing power
Dirty or damaged injectors - Service or change fuel injectors
Improper fuel injection pressure - Check the fuel injection pressure and adjust if necessary
Dirty air filter element - Clean or replace the air filter element
Oil filter is dirty - Replace or clean engine oil filter element
Engine overload - Load reducing required
Valve clearance is not correct - Correct valve clearance
Incorrect low idle speed adjustment - Adjust as required
Clogged fuel hoses or pipes - Fuel hoses and pipes must be clean
Engine compression is insufficient: Worn or damaged valves - Have valves replaced
Engine knocking sound or abnormal noise
Incorrectly set fuel injection pump timing - Repair or replace fuel injection pump
Fuel injector nozzles fault - Service or replace nozzles if required
Engine oil level is insufficient - Check oil level and add oil as required
Low coolant temperature - Warm up engine to required temperature
Main bearings or crankshaft wear - Change defective components as required
Broken or defective piston rings - Replace the piston rings as required
Flywheel screws are loose - Tighten the screws firmly
Excessive oil consumption
External oil leaks: Seals or gaskets are wearing excessively - Replace to repair leaks
Oil viscosity is incorrect - Fill up with the correct oil viscosity
Stuck or worn piston rings - Have piston rings replaced
Worn valve guides and valve stems - Replace defective valves
Worn cylinder liners or pistons - Check pistons and liners, replace as required

Electrical System Troubleshooting
Battery cannot be charged
Bad cell in battery - Replace the battery
Bad battery electrical wire harness - Check wires for malfunctions, repair or replace
Corroded or loose battery terminals and cables - Terminals and cables need to be tightened or cleaned
Incorrect belt tension adjustment or worn belt - Adjust belt tension correctly or replace belt
Starter motor turns slow
Low battery capacity - Low battery charging, charge as required
Battery drains quickly - Service battery or replace it
Bad battery electrical wire harness - Check wires for malfunctions, repair or replace
Corroded or loose battery cables and terminals - Service or tighten battery terminals and cables
Starter doesn't crank
Low battery voltage - Recharge the battery
Discharged or defective battery - Need to charge or replace the battery
Starter motor is damaged - Repair or install a new starter
Improperly connected or disconnected wiring harness - Inspect wiring harness and connect properly

Transmission Troubleshooting
Gear hard to shift
Worn or misadjusted clutch - Adjust clutch or change if necessary
Gear shift linkage is loose or broken - Replace or repair the shift linkage
Shift forks are damaged or worn - Replace the shift forks
Faulty parts in the gear shifting mechanism - Change faulty parts
Transmission oil pressure is insufficient
Oil level is low - Add transmission oil as required
Transmission fluid filter is dirty (if equipped) - Change or service the transmission fluid filter
Relief valve is defective - Change the valve
Excessive transmission noise
Cracked or worn bearings - Faulty bearings should be changed
Fluid level is low - Add transmission fluid as required
Transmission fluid contamination - Fill up with fresh transmission fluid
Gears are worn or backlash is improper - Set backlash properly or change the gears
Damaged or worn shift forks - Shift forks need to be changed
Transmission oil leaks
Gaskets or seals are broken - Install new components
Cracked transmission housing - Housing needs to be replaced

Hydraulics Troubleshooting
Excessive hydraulic system heat
Incorrect pressure in hydraulic system - Changing the system pressure
Main relief valve failure or incorrect setting - Adjust relief valve or change if required
Contaminated hydraulic fluid - Change hydraulic fluid
Air enters in hydraulic system - Check the suction line, pump seals, and fittings
Insufficient hydraulic oil pressure
Lack of hydraulic fluid - Need to add fluid
Hydraulic fluid filter element clogging - Change hydraulic filter element or clean if necessary
Hydraulic pump malfunction - Flow-rate hydraulic pump and replace pump if necessary
Hydraulic control valve is not set properly or defective - Set properly or replace
Faulty hydraulic cylinder - Inspect the hydraulic cylinder components for damage or wear and change if required
Leakage in hydraulic lines - Inspect hydraulic system for leaks and repair it
3-point hitch does not raise or raises very slowly
Hydraulic oil level is low - Fill the hydraulic system with oil
Hydraulic oil is too cold - Allow oil to warm
Hydraulic oil filter clogging - Install a new hydraulic filter element
Hydraulic pump not working - Test pump performance and replace pump if necessary
Main relief valve incorrect adjustment or failure - Adjust relief valve or change if required
Hydraulic control valve block is defective or set improper - Change or set correctly
Defective hydraulic cylinder - Check cylinder parts for wear or damage and replace if necessary
Damaged or loose suction line - Tighten or change
Hitch can't drop or drops too slowly
Defective or not adjusted hydraulic spool valve - Replace or adjust correctly
Defective hydraulic cylinder - Inspect the hydraulic cylinder components for damage or wear and change if required
Lift arm shaft is worn - Replace the shaft
Mechanical components of the hitch are defective - Change faulty or worn hitch parts
3-point hitch lift or lower is jerky
Hydraulic system sucks air - Inspect the suction pipe, fittings, and pump seals
Hydraulic oil contamination - Change the oil
Hydraulic pump failure - Flow-rate pump and change pump if necessary
Hydraulic control valve block is faulty or out of adjustment - Replace or adjust properly
Defective hydraulic cylinder - Check the hydraulic cylinder parts for damage or wear and replace if necessary



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