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Home / Farm Tractors / Kubota Tractors / Kubota M6-111

Kubota M6111 Troubleshooting

The four-wheel drive Kubota M6-111 utility tractor was manufactured between 2015 and 2018. The Kubota M6-111 tractor is equipped with a 230 cu.in (3.8 L) Kubota V3800-TI-CRS 4-cylinder common rail direct injection turbocharged intercooled diesel engine. The engine has a cylinder bore of 3.94" (100 mm), piston stroke of 4.72" (120 mm), and maximum power of 107 hp (79.8 kW). The gear transmission consists of electro-hydraulic wet clutch and partial powershift gearbox with 24 forward and 24 reverse gears.

The maximum forward speed - 22.1 mph (35.6 kph), maximum reverse speed - 22.3 mph (35.9 kph). The closed center hydraulic system has a piston pump with a rated capacity of 18.7 gal/min (70.8 l/min). The hydraulic system pressure is 200 bar (2900 psi). The Kubota M6111 is equipped with a hydrostatic power steering system, hydraulic wet disc brakes, 13.6R24 front tyres, and 18.4R34 rear tyres. The tractor can be equipped with the following attachments: Kubota LA1955 front-end loader with a lift capacity to full height of 4299 lbs (1950 kg).

Engine Troubleshooting
Engine doesn't start or difficult to start
Clogged fuel filter element - Service or replace the filter
The fuel shut-off valve is closed - Open fuel shut-off valve
Air in fuel lines - Bleed fuel lines
Dirty or damaged injectors - Change fuel injectors
Damaged fuel injection pump - Replace or repair injection pump
Low cylinder compression - Check cylinder block and replace damaged components
Engine stalls while running
Engine is not preheated - Warm up the engine
Air in fuel lines - Bleed fuel lines
Bad fuel injection - Check and adjust
Fuel filter is dirty - Service the filter
Fuel injectors are defective or dirty - Clean or replace fuel injectors
Diesel starts but suddenly stops
Unadjusted fuel injection pump timing - Repair or replace fuel injection pump
Clogged fuel filter element - Filter maintenance required
Dirty or defective injector nozzles - Check and change nozzles as required
Fuel injection pump is not working correctly - Rebuild or install a new injection pump
Dirty air cleaner - Clean or replace the air cleaner element
Engine stops at idle
Improperly adjusted low idle speed - Correct the settings
Defective fuel injection pump - Replace or repair injection pump
Damaged or clogged injector nozzles - Check and change nozzles as required
The valve clearance is incorrect - Correct valve clearance
Engine overheats
Insufficient coolant fluid - Add the coolant. Check system for leaks
Cooling system components are worn or system is clogged - Service the cooling system or change faulty parts
Lack of engine oil - Check oil level and add oil as required
Worn fan belt or improper belt tension - Adjust belt tension properly or change it
Thermostat malfunction - Check thermostat, replace if necessary
Lack of engine power
Fuel injectors are clogged or faulty - Change fuel injectors
Incorrect fuel injection pressure - Test fuel injection pressure and adjust it correctly
Air filter element is clogged - Air filter maintenance required
Dirty oil filter element - Replace or service engine oil filter
Engine is overloaded - Load reducing is recommended
Valve clearance is out of adjustment - Correct valve clearance
Low idle speed set incorrectly - Need to adjust idle speed
Fuel pipes or hoses clogging - Service fuel hoses and pipes
Low engine compression: Inlet or outlet valves are defective - Valve replacement required
Engine knocking or noise
Unadjusted fuel injection pump timing - Adjust the fuel injection pump timing correctly
Fuel injector nozzles are dirty or defective - Service or replace injector nozzles
Lack of engine oil - Fill up the oil to required level
Coolant temperature is low - Warm up the engine
Main bearings or crankshaft are worn out - Install new parts
Piston rings are damaged or broken - Have piston rings replaced
Flywheel bolts are loose - Bolts need to be tightened
Engine oil consumption is too high
Oil leaking: Seals or gaskets are wearing excessively - Change to repair leaks
Wrong oil viscosity - Use correct viscosity oil
Piston rings are seized or worn - Install new piston rings
Worn valve stems and valve guides - Valves need to be changed
Cylinder liners or pistons are worn - Check pistons and liners, install new parts as required

Electrical System Troubleshooting
Battery does not charge
Worn-out battery - Change the battery
Battery wiring harness failure - Inspect electrical cables for defects, repair or replace
Battery terminals and cables are corroded or loose - Tighten or service cables and terminals
Belt is damaged or belt tension is incorrectly adjusted - Replace belt or properly adjust belt tension
Starter motor turns slow
Battery power is low - Low battery charging, charge as required
Battery runs out quickly - Service or change the battery
Damaged battery wiring harness - Inspect wiring for damage, replace or repair
Loose or corroded terminals and cables - Tighten or service terminals and cables
Starter does not work
Low battery output - Charge the battery
Discharged or faulty battery - Battery needs to be recharged or replaced
Defective starter motor - Repair or replace starter
Wiring harness is disconnected or improperly connected - Check wiring harness and reconnect properly

Transmission Troubleshooting
Gear hard to shift
Failure or improper clutch adjustment - Replace or adjust clutch
Damaged or loose gear shift linkage - Repair or change shift linkage
Shift forks are damaged or worn - Replace defective shift forks
Defective gearshift mechanism - Replace defective components
Insufficient transmission fluid pressure
Fluid level is low - Check transmission fluid level and add it as required
Transmission fluid filter is plugged (if fitted) - Change or service the transmission fluid filter
Relief valve is defective - Install a new relief valve
Transmission makes excessive noise
Damaged or worn bearings - Replace the bearings
Fluid level is low - Fill up the transmission fluid
Transmission fluid contamination - Change transmission fluid
Damaged gears or improper backlash - Replace gears or adjust backlash properly
Worn or damaged shift forks - Install new shift forks
Transmission fluid leaking
Gaskets or seals are damaged - Change defective gaskets or seal
Transmission housing is cracked - Replace housing or transmission assembly

Hydraulics Troubleshooting
Hydraulic system overheats
Incorrect hydraulic pressure adjustments - Adjust correctly
Misadjusted or defective main relief valve - Adjust or change relief valve
Contaminated hydraulic oil - Change hydraulic oil
Air trapped in the hydraulic system - Check the suction pipe, fittings, and pump seals
Low hydraulic system pressure
Not enough hydraulic fluid in the system - Need to add fluid
Hydraulic oil filter is dirty - Clean or change hydraulic filter
Defective hydraulic pump - Check pump capacity and change if necessary
Hydraulic spool valve block is defective or set improper - Replace or adjust correctly
Hydraulic cylinder is broken - Inspect cylinder parts for wear or damage and replace if required
Leakage in hydraulic pipes - Find leaks in hydraulic system and repair it
Hitch cannot be lifted or lifting is too slow
Hydraulic fluid level is low - Fill the hydraulic system with oil
Cold fluid in hydraulic system - Wait for fluid to warm up
Hydraulic oil filter is dirty - Replace filter element or clean if required
Faulty hydraulic oil pump - Flow-rate pump and change pump if necessary
Defective or misadjusted main relief valve - Adjust the valve or replace if necessary
Faulty or incorrect setting hydraulic control valve - Adjust properly or replace
Hydraulic cylinder is faulty - Inspect the hydraulic cylinder parts for damage or wear and replace if required
Damaged or disconnected hydraulic suction pipe - Connect or replace the pipe
Three-point hitch dropping is too slow or cannot be dropped
Hydraulic control valve block is faulty or out of adjustment - Change or adjust correctly
Hydraulic cylinder failure - Check the hydraulic cylinder parts for damage or wear and replace if necessary
Worn lift arm shaft - Install a new shaft
The hitch has internal mechanical malfunctions - Replace damaged or worn hitch parts
Hitch jerks when drop or lift
Air enters in hydraulic system - Check the pump seals, suction pipe, and fittings
Contaminated hydraulic oil - Change hydraulic oil
Faulty hydraulic oil pump - Check the pump performance and replace it if required
Damaged or incorrect adjusted hydraulic control valve - Change or adjust correctly
Hydraulic cylinder is faulty - Inspect the hydraulic cylinder parts for damage or wear and replace if required

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