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Kubota L2501HST Troubleshooting
The
Kubota L2501HST is a 4-wheel drive utility compact tractor. This model was
manufactured from 2014 to 2021. The Kubota L2501HST powertrain system
components: Kubota D1703-M-DI-E4 4-cycle vertical 3-cylinder direct injection
naturally aspirated water-cooled diesel engine and 3-range hydrostatic
transmission with infinite forward and reverse gears.
A 100.5 cubic inches (1.65L) engine has a cylinder bore of 3.43" (87
mm), piston stroke of 3.64" (92.4 mm), rated power of 24.8 hp (18.5 kW),
and maximum torque of 95.2 Nm (70.2 lb-ft) at 1500 rpm. The maximum
forward speed - 3.2 mph (5.1 km/h) using low range or 11.5 mph (18.5
km/h) using high range, maximum reverse speed - 2.9 mph (4.6 km/h) using
low range or 10.3 mph (16.6 km/h) using high range. The open center
hydraulic system used a gesr pump with a flow of 5.2 gal/min (19.5
l/min). The hydraulic pressure is 152 bar (2205 psi).
The Kubota L2501HST is equipped with an integral power steering, wet
disc brakes, 7.2x16 (AG) or 27x8.50-15 (Industrial) front tires, and
11.2x24 (AG) or 15x19.5 (Industrial) rear tires. The wheel base is 63.3"
(1610 mm). The tractor is compatible with a
Kubota LA525 front-end
loader with lift capacity to full height of 1131 lbs (513 kg), and
Kubota BH77 backhoe with 2-ft flat digging depth of 89.8" (2280 mm).
| Engine Troubleshooting |
| Engine will not start or starts up hard |
| Plugged fuel filter - Change filter element |
| The fuel shut-off valve is closed - Open fuel shut-off valve |
| Air trapped in fuel system - Bleed air |
| Faulty or dirty injectors - Service or change fuel injectors |
| Fuel injection pump failure - Repair or change injection pump |
| Engine has low compression - Check cylinder block and replace damaged components |
| Engine shuts off unexpectedly while running |
| Engine is not preheated - Warm up the engine |
| Fuel-line is leaking air - Retighten clamps, replace defective pipes |
| Uneven fuel injections - Repair or adjustment |
| Fuel filter plugging - Service or replace the filter |
| Clogged or damaged injectors - Inspect fuel injectors and replace if necessary |
| Engine starts but then shuts off |
| Incorrect setting of fuel injection pump timing - Adjust injection timing |
| Clogged fuel filter element - Change filter element |
| Faulty fuel injector nozzles - Check and change nozzles as required |
| Fuel injection pump is not working correctly - Rebuild or replace pump |
| Air cleaner element clogging - Replace or service air cleaner element |
| Incorrect low idle setting - Correct low idle settings |
| Defective fuel injection pump - Install a new pump or rebuild |
| Fuel injector nozzles are defective or dirty - Change injector nozzles |
| Valve clearance is not correct - Have it adjusted |
| Lack of coolant in cooling system - The cooling system needs to be refilled. Repair any leaks if necessary |
| Cooling system is dirty or cooling components are damaged - Flush cooling system or change faulty components |
| Engine oil level is insufficient - Add oil to the engine crankcase |
| Incorrect fan belt tension or broken belt - Adjust belt tension correctly or replace it |
| Thermostat is defective - Install new thermostat |
| Engine power is insufficient |
| Dirty or damaged injectors - Test fuel injectors and change if necessary |
| Uneven fuel injection pressure - Adjust pressure to proper level |
| Air filter clogging - Replace or service air filter element |
| Clogged oil filter - Replace or clean engine oil filter element |
| Diesel engine is overloaded - Reduce the load or use a lower gear |
| The valve clearance is incorrect - Check and adjust |
| Low idle speed adjustment is incorrect - Correct the settings |
| Dirty fuel hoses or pipes - Clean fuel system pipes and hoses |
| Poor engine compression: Leaking or faulty valves - Change the valves |
| Abnormal engine knocking or noise |
| Incorrectly set fuel injection pump timing - Repair or replace fuel injection pump |
| Fuel injector nozzles are damaged or dirty - Change injector nozzles |
| Engine oil level is insufficient - Check and refill engine oil |
| Engine is not warmed up to the required temperature - Warm up the engine as required |
| Main bearings or crankshaft wear - Repair or replace defective parts |
| Piston rings are defective or broken - Install new piston rings |
| Flywheel mounting screws are loose - Tighten the screws |
| Diesel engine using too much oil |
| External oil leaks: Gaskets or seals are excessively worn - Replace defective parts |
| Oil viscosity is wrong - Fill up with the correct oil viscosity |
| Worn or stuck piston rings - Have piston rings replaced |
| Worn valve stems and valve guides - Install new valves |
| Scored cylinder liners or pistons - Check liners and pistons, change as required |
| Electrical System Troubleshooting |
| Battery cannot be charged |
| Battery failing - Battery replacement required |
| Battery electrical wire harness damage - Check battery wires for damage, replace or change |
| Battery terminals and cables are loose or corroded - Terminals and cables need to be tightened or cleaned |
| Belt is defective or belt tension is improperly adjusted Adjust belt tension properly or change belt |
| Battery voltage is low - Battery is drained, recharge it |
| Battery won’t hold charge - Service battery or replace it |
| Bad battery cable harness - Inspect cables for malfunctions, repair or change |
| Loose or corroded cables and terminals - Tighten or clean terminals and cables |
| Low battery output - Battery needs to be recharged |
| Discharged or faulty battery - Recharge or replace battery |
| Starter motor is faulty - Replace or repair starter |
| Cables harness is improperly connected or disconnected - Inspect cables harness and reconnect it properly |
| Hydrostatic Transmission Troubleshooting |
| Hydrostatic transmission makes noise |
| Transmission oil level is too low or oil is dirty - Fill the transmission with fresh oil or add transmission oil to the correct level |
| Speed control rod linkage is worn or not adjusted - Change or adjust rod linkage |
| Faulty relief valve - Install a new valve |
| Transmission is under excessive load - Load needs to be reduced |
| Defective or worn components of hydrostatic transmission - After disassembling and checking, change defective parts |
| Transmission oil overheating |
| Insufficient fluid supply - Fill the transmission housing with fluid |
| Plugged transmission fluid filter - Change or service the transmission fluid filter |
| Cooling components are damaged or clogged - Inspect all cooling components and replace or clean if necessary |
| Transmission overload - Reduce transmission load |
| Low transmission fluid level - Fill system with correct transmission fluid level |
| Low charge pressure - Test charge pressure |
| Relief valve is defective or worn - Change relief valve |
| Gaskets or seals are damaged - Seals and gaskets replacement required |
| Internal transmission case pressure is too high - Repair or replace worn parts |
| Oil return tube is clogged - Inspect tube and service if required |
| Hydraulics Troubleshooting |
| Excessive hydraulic system heat |
| Incorrect hydraulic pressure adjustments - Adjust correctly |
| Unadjusted or defective main relief valve - Replace or set up the relief valve |
| Hydraulic oil is contaminated - Fill up with fresh hydraulic oil |
| Aeration in hydraulic system - Check the pump seals, suction line, and fittings |
| Insufficient hydraulic oil pressure |
| Hydraulic fluid level is low - Add fluid to the hydraulic system |
| Hydraulic fluid filter is clogged - Install a new hydraulic filter element |
| Hydraulic pump is faulty - Test the pump flow rate and change pump if required |
| Hydraulic spool valve block is faulty or out of adjustment - Change or adjust properly |
| Faulty hydraulic cylinder - Check the hydraulic cylinder parts for damage or wear and replace if necessary |
| Hydraulic piping leaks - Find leaks in hydraulic system and repair it |
| Hitch fails to lift or lifts slowly |
| Lack of hydraulic fluid - Need to add fluid |
| Cold hydraulic fluid - Warm up the fluid |
| Hydraulic fluid filter element clogging - Change hydraulic filter element or clean if necessary |
| Hydraulic pump not working - Check pump flow and change pump if necessary |
| Main relief valve failure or incorrect setting - Adjust the valve or replace if necessary |
| Hydraulic spool valve is defective or set improper - Replace or adjust properly |
| Hydraulic cylinder is defective - Inspect cylinder components for damage or wear and change if required |
| Loose or damaged suction line - Tighten or replace |
| Hitch won't lower or lowers slowly |
| Faulty or incorrect setting hydraulic spool valve - Replace or set correctly |
| Hydraulic cylinder failure - Inspect the hydraulic cylinder parts for damage or wear and replace if required |
| Worn hitch rock shaft - Change the shaft |
| Damaged mechanical components of the hitch - Replace faulty or worn hitch parts |
| Hitch jerks when lower or lift |
| Air enters in hydraulic system - Inspect the suction pipe, fittings, and pump seals |
| Dirty hydraulic oil - The oil must be changed |
| Faulty hydraulic oil pump - Flow-rate hydraulic pump and replace pump if necessary |
| Defective or not adjusted hydraulic control valve - Replace or adjust properly |
| Hydraulic cylinder is broken - Check the hydraulic cylinder parts for damage or wear and replace if necessary |
| Steering System Troubleshooting |
| Excessive effort to steer |
| Worn or improperly mounted steering column - Mount the steering column properly or change it |
| Air trapped in the steering system - Bleed the steering system |
| Not adjusted toe-in - Check toe-in and correct |
| Tire pressure is improper - Inflate the tires properly |
| Steering pump failure - Replace or repair steering pump |
| Worn or defective steering control valve - Inspect and replace as required |
| Worn steering box components - Defective power steering box components must be replaced |
| Steering oil level is low - Fill up steering oil to required level |
| Steering system has oil leaks - Tighten the steering hose and pipe joints |
| Excessive free play of steering wheel |
| Worn steering column coupling or shaft - Replace faulty part |
| Faulty or worn steering control valve - Check and replace as required |
| Faulty steering box parts - Repair power steering box |
| Steering pump malfunction - Replace or repair steering pump |
| Worn or faulty steering linkage or tie-rod ends - Replace damaged component |
| Tractor is pulling to left or right |
| Improper tire pressure - Check the pressure and inflate tires as required |
| Improper toe-in - Check and adjust toe-in |
| Steering linkage or tie-rod ends are worn - Replace failed component |
| Faulty steering box components - Repair power steering box |
| Steering control valve is defective or worn - Change or repair steering valve if required |
| Damaged or improperly adjusted or worn front hub bearings - Adjust correctly or change bearings |
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| Farm Tractors Technical Specifications |
