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