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Kubota L4701 Troubleshooting
The
Kubota L4701 compact utility tractor was manufactured from 2014 to 2021. This
model was designed in 2 versions: L4701F (2WD) and L4701DT (4WD). The Kubota
L4701 driveline consists of a 148.5 cu.in (2.43 L) Kubota V2403-CR-E4 4-cycle
vertical 4-cylinder direct injection water-cooled diesel engine with a rated
power of 47.3 Hp (35.2 kW), and Synchro-Shuttle transmission with 8 forward and
8 reverse gears.
Max forward speed - 14.9 mph (24.1 km/h), maximum reverse speed - 14.3
mph (23.1 km/h). The open center hydraulic system includes a gear pump
with fluid flow rate of 7.8 gallons per minute (29.5 liters per minute).
The hydraulic pressure is 177 bar (2560 psi). The 2-wheel drive models
are equipped with 7.5Lx15 front tires and 14.9x24 rear tires. The 8.3x16
front tires and 14.9x24 rear tires are used for tractors with 4-wheel
drive.
The wheel base is 72.8" (1850 mm) for 4x2 (2WD) models and 72.6" (1845
mm) for 4x4 (4WD) models. Compatible attachments for the tractor:
Kubota
LA765 front-end loader with a maximum lift height of 105.2" (2670 mm),
and Kubota BH92 backhoe with 2-ft flat digging depth of 106.1" (2690
mm).
| Engine Troubleshooting |
| Engine won't start or hard to start |
| Fuel filter is clogged - Clean or change the filter |
| The fuel shut-off valve is closed - Open fuel shut-off valve |
| Air in fuel system - Air-bleed fuel system |
| Faulty or dirty injectors - Clean or replace fuel injectors |
| Fuel injection pump malfunction - Change pump or rebuild it |
| Bad engine compression - Check cylinder block and replace worn parts |
| Engine stalls while running |
| Engine is not fully warmed up - Warm up to required temperature |
| Water, dirt, or air in fuel system - Drain, flush, fill, and bleed system |
| Uneven fuel injections - Repair or adjustment |
| Clogged fuel filter element - Replace the filter element |
| Fuel injectors are damaged or dirty - Test fuel injectors and change if necessary |
| Timing of fuel injection pump is not adjusted - Fuel injection pump timing adjustment needs to be corrected |
| Clogged fuel filter element - Change filter element |
| Dirty or defective injector nozzles - Service or replace nozzles if required |
| Fuel injection pump malfunction - Replace or rebuild injection pump |
| Dirty air cleaner element - Install new cleaner element or replace it |
| Low idle speed setting is incorrect - Adjust as required |
| Faulty fuel injection pump - Install a new pump or rebuild |
| Fuel injector nozzles are faulty - Change injector nozzles |
| Excessive valve clearance - Check and adjust |
| Lack of coolant in cooling system - Fill radiator to proper level. Check system for leaks |
| Cooling system parts are defective or system is clogged - Change faulty components or flush the cooling system |
| Insufficient engine oil - Check and refill engine oil |
| Worn fan belt or improper belt tension - Adjust belt tension correctly or change it |
| Thermostat malfunction - Check and replace if required |
| Clogged or damaged injectors - Clean or replace fuel injectors |
| Insufficient fuel injection pressure - Adjust to correct pressure |
| Air filter is clogged - Service or change air filter |
| Clogged oil filter - Replace or service engine oil filter |
| Engine overload - Reduce engine load |
| Valve out of adjustment - Have it adjusted |
| Incorrectly set low idle speed - Correct low idle adjustment |
| Fuel pipes or hoses clogging - Clean fuel hoses and pipes |
| Insufficient engine compression: Valves are faulty or leaking - Replace the valves |
| Abnormal engine noise or knocking |
| Incorrect setting of fuel injection pump timing - Check and correct adjustments |
| Dirty or defective injector nozzles - Test injector nozzles and replace as required |
| Engine oil level is low - Fill up the oil to required level |
| Coolant temperature is low - Warm up engine as required |
| Crankshaft or main bearings wear - Change defective components as required |
| Stuck or worn piston rings - Have piston rings replaced |
| Loose flywheel screws - Inspect the flywheel screws and tighten securely |
| Engine using too much oil |
| Oil leaking: Damaged gaskets or seals - Replace worn parts to avoid leaks |
| Improper oil viscosity - Fill up with the proper oil viscosity |
| Damaged or seized piston rings - Have piston rings replaced |
| Valve stems and guides are worn - Valves need to be changed |
| Damaged cylinder liners or pistons - Inspect liners and pistons, replace as necessary |
| Electrical System Troubleshooting |
| Battery won’t charge |
| Battery is defective - Use a new battery |
| Battery wiring harness damage - Inspect battery wiring for damage, replace or repair |
| Loose or corroded cables and terminals - Service or tighten battery terminals and cables |
| Improper belt tension adjustment or damaged belt - Adjust belt tension properly or change belt |
| Low battery output - Charge the battery |
| Battery discharges quickly - Service or change the battery |
| Battery electrical wire harness failure - Inspect wires for defects, change or repair |
| Loose or corroded terminals and cables - Tighten or clean terminals and cables |
| Battery voltage is low - Battery is drained, recharge it |
| Discharged or worn battery - Charge or change the battery |
| Starter motor failure - Starter should be changed |
| Improperly connected or disconnected cables - Check battery cables and connect properly |
| Transmission Troubleshooting |
| Gears are hard to shift |
| Misadjusted or defective clutch - Adjust correctly or replace |
| Gear shift linkage is loose or broken - Replace or repair the shift linkage |
| Worn or damaged shift forks - Replace defective shift forks |
| Defective gearshift mechanism - Replace defective components |
| Insufficient transmission fluid pressure |
| Insufficient oil supply - Fill up the transmission oil |
| Clogged transmission oil filter (if equipped) - Change or clean the transmission oil filter |
| Relief valve is defective - Install a new relief valve |
| Transmission is making noise |
| Cracked or worn bearings - Faulty bearings should be changed |
| Low transmission fluid level - Fill the transmission housing with fluid |
| Contaminated transmission fluid - Fill up with fresh transmission fluid |
| Improper backlash or damaged gears - Replace gears or adjust backlash properly |
| Shift forks are worn or damaged - Install new shift forks |
| Transmission fluid leaking |
| Gaskets or seals are defective Gaskets or seal replacement required |
| Cracked transmission housing - Housing needs to be replaced |
| Hydraulics Troubleshooting |
| Hydraulic system is too hot |
| Incorrect pressure in hydraulic system - Changing the system pressure |
| Main relief valve malfunction or incorrect adjustment - Adjust relief valve or change if required |
| Contaminated hydraulic oil - Change hydraulic oil |
| Hydraulic system sucks air - Inspect the pump seals, suction pipe, and fittings |
| Low hydraulic oil pressure |
| Hydraulic fluid level is low - Check and refill the hydraulic fluid |
| Hydraulic fluid filter element is dirty - Replace hydraulic filter element or service if necessary |
| Hydraulic pump failure - Check the pump performance and replace it if required |
| Damaged or incorrect adjusted hydraulic control valve - Set correctly or replace |
| Hydraulic cylinder malfunction - Check cylinder components for damage or wear and change if necessary |
| Leakage in hydraulic lines - Identify leaks in the system and repair it |
| Hitch fails to lift or lifts slowly |
| Lack of hydraulic fluid - Need to add fluid |
| Hydraulic fluid is too cold - Allow fluid to warm |
| Hydraulic oil filter element clogging - Clean the hydraulic filter element or replace if necessary |
| Defective hydraulic pump - Check pump flow and change pump if necessary |
| Unadjusted or defective main relief valve - Adjust relief valve or change if required |
| Hydraulic control valve block is not set properly or defective - Change or adjust correctly |
| Faulty hydraulic cylinder - Check cylinder components for wear or damage and change if necessary |
| Damaged or disconnected hydraulic suction pipe - Connect or replace the pipe |
| 3-point hitch fails to drop or drops slowly |
| Damaged or incorrect adjusted hydraulic control valve - Replace or set properly |
| Hydraulic cylinder is not working - Check cylinder components for damage or wear and change if necessary |
| Hitch rock shaft is worn Replace the shaft |
| Damaged mechanical components of the hitch - Replace worn or faulty hitch components |
| Hitch lowering or lifting is not smoothly |
| Air leaks in hydraulic system - Inspect the pump seals, suction pipe, and fittings |
| Dirty hydraulic oil - The oil must be changed |
| Damaged hydraulic oil pump - Check the pump performance and replace it if required |
| Hydraulic spool valve block is defective or set improper - Adjust properly or change |
| Hydraulic cylinder is faulty - Check cylinder components for wear or damage and change if necessary |
| Steering System Troubleshooting |
| Steering is stiff |
| Steering column is damaged or improperly mounted - Replace the steering column or mount it properly |
| Aeration in steering system - Bleed air |
| Not adjusted toe-in - Check and adjust toe-in |
| Tire pressure is not correct - Check tire pressure and inflate as required |
| Faulty steering pump - Check the hydraulic steering pump and change if necessary |
| Damaged or worn hydrostatic steering unit - Inspect and replace as required |
| Relief valve malfunction or sticking - Check relief valve and change if required |
| Lack of steering oil - Fill the steering system with oil |
| Oil leaks in the steering system - Tighten connections of hydraulic hoses and pipes in steering system |
| Excessive play in steering |
| Steering column coupling or shaft is extremely worn out - Replace faulty part |
| Worn or damaged hydrostatic steering unit - Inspect and change as required |
| Hydraulic steering pump is defective - Repair or replace steering pump |
| Faulty or worn steering linkage or tie-rod ends - Change failed part |
| Tractor is pulling to left or right |
| Front tires are worn out - Install new tires |
| Toe-in adjustment is incorrect - Adjust toe-in correctly |
| Steering tie-rod ends or linkage are defective - Change failed part |
| Hydrostatic steering unit is damaged or worn - Change or repair steering unit if required |
| Damaged steering cylinder - Repair or change hydraulic steering cylinder |
| Front hub bearings are incorrectly adjusted or worn - Replace the bearings or adjust it properly |
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| Farm Tractors Technical Specifications |
