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Kubota M4072 Troubleshooting

The Kubota M4072 is a 4WD 4x4 utility tractor from the M4002 series. This model manufactured from 2018. The M4072 tractor is powered by Kubota V3307-CRS-TE4 four-stroke 4-cylinder direct injection diesel engine with max. output power of 74 Hp (55.2 kW) and 265 Nm (196 lb-ft) of max torque at 1500 rev/min.

The Kubota M4072 is fitted with two transmission options: 6-speed synchronized transmission with 18 forward and 16 reverse gears, or 36x36 Dual speed transmission. Max. travel speed (forward/reverse): 24.9 mph (40 km/h). The closed center hydraulic system used a piston pump with rated capacity of 16.6 gal/min (62.8 l/min).

The rear lift capacity is 5510 lbs (2500 kg) at pin. The Kubota M4072 tractor fitted with 320/85R20 front tires and 420/85R30 rear tires. The wheelbase is 84.1 inches (2130 mm). The tractor is compatible with Kubota LA1365 front end loader.

Engine Troubleshooting
Engine will not start or hard to start
Fuel filter is dirty - Service or replace the filter
Closed fuel cock - Open fuel on-off cock to inject fuel
Air in fuel lines - Bleed fuel lines
Clogged fuel injectors - Clean or replace fuel injectors
Damaged fuel injection pump - Repair or replace injection pump
Poor cylinder compression - Check cylinder block and change faulty parts
Engine stops unexpectedly while running
Engine has not warmed up to required temperature - Warm up engine as required
Air in fuel lines - Bleed fuel lines
Improper fuel injection - Fuel injection settings required
Plugged fuel filter - Clean or replace the filter
Dirty or damaged injectors - Check fuel injectors and replace if required
Diesel starts and immediately stops
Incorrect setting of fuel injection pump timing - Correct injection timing
Fuel filter plugging - Service the filter
Fuel injector nozzles are damaged or dirty - Inspect injector nozzles and change if required
Fuel injection pump is not operating properly - Change pump or rebuild it
Air cleaner element is clogged - Change or service air cleaner element
Engine shuts off while idling
Low idle speed setting is not correct - Adjust the low idle speed
Fuel injection pump failure - Change pump or rebuild it
Faulty fuel injector nozzles - Change injector nozzles
Valve clearance is not correct - Check and adjust as required
Engine overheated
Not enough coolant - Fill the cooling system. Check for coolant leaks
Cooling system components are defective or system is clogged - Service the cooling system or change faulty parts
Low engine oil level - Add oil to the engine crankcase
Broken fan belt or incorrect belt tension - Change or adjust belt tension correctly
Thermostat fault - Check thermostat, replace if necessary
Engine lacks power
Fuel injectors are clogged or faulty - Change fuel injectors
Fuel injection pressure is wrong - Adjust to proper pressure
Dirty air filter - Replace or clean the air filter element
Engine oil filter is plugged - Clean or replace engine oil filter element
Diesel engine overloaded - Reduce the load or operate the tractor in lower gears
Valve clearance is wrong - Adjust to proper valve clearance
Incorrect low idle setting - Normalize low idle speed
Fuel pipes or hoses are dirty - Clean fuel system hoses and pipes
Engine lost compression: Valves are damaged or leaking - Replace the valves as required
Engine noises or knocks
Fuel injection pump out of timing - Fuel pump timing settings need to be corrected
Fuel injector nozzles are clogged or faulty - Check and change nozzles as required
Engine oil insufficient - Checking oil level and add if necessary
Engine is not fully warmed up - Warm up the engine as required
Main bearings or crankshaft wear - Crankshaft or bearings need to be replaced
Piston rings are damaged or broken - Install new piston rings
Flywheel bolts are loose - Bolts need to be tightened
High oil consumption
Oil leaking: Worn seals or gaskets - Install new components
Incorrect oil viscosity - Fill up with the proper oil viscosity
Piston rings are stuck or worn - Piston rings replacement required
Valve guides or stems are damaged - Replace the valves
Damaged pistons or cylinder liners - Check pistons and liners, change as required

Electrical System Troubleshooting
Battery does not charge
Defective battery - Battery replacement required
Battery electrical wire harness failure - Inspect wires for defects, change or repair
Loose or corroded cables and terminals - Tighten or service cables and terminals
Defective belt or improperly adjusted belt tension - Adjust belt tension properly or change belt
Starter motor cranks slow
Low battery output - Battery is drained, charge it
Battery discharges quickly - Battery needs service or replacement
Battery electrical wire harness failure - Inspect wires for defects, change or repair
Battery terminals and cables are loose or corroded - Clean or tighten cables and terminals
Starter will not crank
Low battery output - Battery needs to be recharged
Discharged or defective battery - Replace or charge as required
Faulty starter motor - Replace or repair starter
Improperly connected or disconnected wiring harness - Inspect wiring harness and connect properly

Transmission Troubleshooting
Hard to shift gears
Worn or incorrectly adjusted clutch - Adjust correctly or replace
Damaged or loose gear shift linkage - Repair or change shift linkage
Shift forks are damaged or worn - Install new shift forks
Defective gearshift mechanism - Replace defective components
Low transmission oil pressure
Not enough fluid in transmission - Fill the transmission housing with fluid
Transmission fluid filter is plugged (if fitted) - Clean or replace the transmission fluid filter
Relief valve failure - Replace valve as required
Excessive transmission noise
Broken or worn bearings - Change faulty bearings
Oil level is low - Checking transmission oil level and add if necessary
Contaminated transmission oil - Fill up with fresh transmission oil
Worn gears or improper backlash - Replace gears or set backlash properly
Bent or worn shift forks - Replace defective shift forks
External oil leaks
Worn gaskets or seals - Install new components
Cracked transmission housing - Housing needs to be replaced

Hydraulics Troubleshooting
Hydraulic system is too hot
Hydraulic system pressure is incorrect - Hydraulic pressure needs to be set correctly
Main relief valve failure or incorrect setting - Adjust or replace the relief valve
Contaminated hydraulic oil - Change hydraulic oil
Air enters in hydraulic system - Inspect the pump seals, suction pipe, and fittings
Hydraulic fluid pressure too low
Not enough hydraulic oil in the system - Add oil to the hydraulic system
Hydraulic oil filter element is dirty - Clean or change hydraulic filter
Defective hydraulic pump - Test the pump performance and change pump if required
Damaged or incorrect adjusted hydraulic control valve - Replace or set properly
Hydraulic cylinder malfunction - Check the hydraulic cylinder parts for damage or wear and replace if necessary
Hydraulic piping leaks - Identify leaks in the system and repair it
Hitch fails to lift or lifts slowly
Hydraulic fluid level is insufficient - Fill the hydraulic system with oil
Cold hydraulic oil - Warm up the oil
Hydraulic fluid filter 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 is defective or set improper - Adjust correctly or change
Faulty hydraulic cylinder - Check cylinder components for wear or damage and change if necessary
Suction pipe is damaged or loose - Repair or change
3-point hitch fails to drop or drops slowly
Faulty or incorrect setting hydraulic spool valve - Replace or set properly
Faulty hydraulic cylinder - Inspect cylinder components for wear or damage and change if required
Lift arm shaft is worn - Change the shaft
The hitch has internal mechanical malfunctions - Change damaged or worn hitch parts
Hitch jerks when drop or lift
Hydraulic system sucks air - Check the pump seals, suction pipe, and fittings
Hydraulic oil is contaminated - Fill up with fresh hydraulic oil
Hydraulic pump not working - Test pump performance and replace pump if necessary
Hydraulic control valve block is faulty or out of adjustment - Replace or adjust correctly
Hydraulic cylinder is not working - Check cylinder components for wear or damage and change if necessary

Steering System Troubleshooting
Hard Steering
Steering column is defective or improperly assembled - Change steering column or assemble properly
Air trapped in the steering system - Air-bleed steering system
Toe-in adjustment is incorrect - Check and adjust toe-in
Front tires are worn out - Install new tires
Hydraulic steering pump is defective - Replace or repair steering pump
Hydrostatic steering unit has wear or damage - Inspect and change as required
Relief valve is worn or seized - Install a new relief valve or clean it
Low steering fluid level - Fill the steering system with fluid
Steering system oil leakage - Tighten the steering line and hose joints
Excessive play in steering
Steering column coupling or shaft has maximum wear - Replace faulty component
Hydrostatic steering unit has wear or damage - Inspect and replace as required
Hydraulic steering pump is defective - Install a new hydraulic steering pump
Steering tie-rod ends or linkage are defective - Replace failed part
Front wheels wander to right or left
Tires are not correctly inflated - Inflate tires as necessary
Incorrect toe-in - Check and adjust toe-in
Steering linkage or tie-rod ends are defective - Change damaged component
Hydrostatic steering unit is defective or worn - Check and replace as required
Worn steering cylinder - Change or repair steering cylinder
Front hub bearings are defective or improperly adjusted - Adjust correctly or install new bearings



Farm Tractors Technical Specifications
JD 1026R JD 3650 JD 6400 JD 7810
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MF 250 MF 690 MF 3060 MF 6180
NH TC48DA NH M100 NH T7550 NH 8560
CASE IH 495 CASE IH 1255XL CASE IH 2140 CASE IH 2294