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