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Kubota L4200 Troubleshooting
The
Kubota L4200 is a Grand L series compact utility tractor. This model was
manufactured from 1994 to 1999. The Kubota L4200 tractor is powered by Kubota
V2203-A 4-cylinder indirect injection diesel engine with a rated power of 45.3
Hp (35.3 kW) and 139.1 Nm (102.9 lb-ft) of max torque at 1500 rpm.
The Kubota L4200 was fitted with 2 types of transmission: 8x8 FST Sync
Shuttle fully synchronized transmission or Glide Shift transmission with
8 forward and 8 reverse gears (16x16 with creeper). The maximum travel
speed (forward/reverse): 14.7 mph (23.7 km/h) and 13.5 mph (21.7 km/h).
The open center hydraulic system used a gear pump with a flow rate of
7.8 gal/min (29.5 l/min). The main relief pressure is 173 bar (2520
psi). The 2-wheel drive models are equipped with 6.00x16 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 wheelbase is 71.3" (1810 mm)
for models with 2WD and 71.1" (1805 mm) for models with 4WD.
The Kubota L4200 is compatible with the following attachments: 60" and
72" front-mount 3-blade mower decks with hydraulic lift system,
Kubota
LA681 loader with lift capacity to full height of 1499 lbs (679 kg), and
Kubota BL4690 backhoe with max digging depth of 90.2" (2290 mm).
| Engine Troubleshooting |
| Engine will not start or difficult to start |
| Plugged fuel filter - Replace the filter element |
| No fuel supply from the tank - Open the fuel supply valve |
| Air in fuel system - Air-bleed fuel system |
| Clogged or damaged injectors - Test fuel injectors and change if necessary |
| Fuel injection pump is not operating properly - Change or repair the pump |
| Bad engine compression - Check and replace worn parts |
| Engine stops running while driving |
| Engine is cold - Warm up engine as required |
| Water, dirt, or air in fuel system - Drain, flush, fill, and bleed system |
| Bad fuel injection - Check and adjust |
| Fuel filter clogging - Change the filter element |
| Dirty or faulty injectors - Clean or replace fuel injectors |
| Diesel engine stops after starting |
| Timing of fuel injection pump is wrong - Fuel injection pump timing adjustment needs to be corrected |
| Dirty fuel filter element - Clean or change the filter |
| Fuel injector nozzles are dirty - Service or replace nozzles if required |
| Fuel injection pump is damaged - Replace injection pump or repair it |
| Clogged air cleaner - Replace or service air cleaner element |
| Engine stalls at low idle speed |
| Low idle speed set incorrectly - Adjust low idle speed |
| Fuel injection pump is not working correctly - Replacement or repair required |
| Fuel injector nozzles are dirty or defective - Service or replace nozzles if required |
| Valve out of adjustment - Adjust valve clearance |
| Coolant level is low - Fill radiator to proper level. Repair any leaks if necessary |
| Cooling system components are failed or system is dirty - Replace faulty parts or flush the cooling system |
| Low engine oil level - Check and refill engine oil |
| Fan belt tension is unadjusted or belt is damaged - Adjust correctly or install new belt |
| Thermostat fault - Install new thermostat |
| Fuel injectors are clogged or faulty - Service or change fuel injectors |
| Uneven fuel injection pressure - Adjust to proper pressure |
| Air filter element clogging - Clean or replace the air filter element |
| Oil filter element clogging - Service or replace engine oil filter |
| Engine is overloaded - Load reducing is recommended |
| The valve clearance is incorrect - Correct valve clearance needs to be set |
| Low idle speed setting is not correct - Normalize low idle speed |
| Dirt in the hoses or pipes - Service fuel hoses and pipes |
| Lack of compression: Inlet or outlet valves are defective - Install new valves |
| Abnormal engine noise or knocking |
| Unadjusted fuel injection pump timing - Repair or replace fuel injection pump |
| Fuel injector nozzles are damaged - Test injector nozzles and replace as required |
| Lack of engine oil - Add oil to the engine crankcase |
| Engine is cold - Warm up the engine |
| Worn crankshaft or main bearings - Crankshaft or bearings need to be replaced |
| Damaged or defective piston rings - Piston rings need to be replaced |
| Flywheel screws are loose - Tighten the screws firmly |
| Engine consuming too much oil |
| Oil leaks: Defective seals or gaskets - Replace to repair leaks |
| Incorrect oil viscosity - Fill up with the correct oil viscosity |
| Damaged or seized piston rings - Replace piston rings |
| Valve guides and stems are worn - Need to replace the valves |
| Pistons or cylinder liners are worn - Inspect pistons and liners, change as required |
| Electrical System Troubleshooting |
| Battery cannot be charged |
| Defective battery - Install a new battery |
| Damaged battery cable harness - Check electrical cables for damage, repair or replace |
| Loose or corroded battery terminals and cables - Tighten or clean terminals and cables |
| Belt wear or improper belt tension adjustment - Install new belt or adjust belt tension as required |
| Low battery voltage - Battery is drained, recharge it |
| Battery runs out quickly - Service battery or replace it |
| Battery electrical wire harness failure - Inspect wires for defects, change or repair |
| Battery cables and terminals are loose or corroded - Cables and terminals must be tightened or cleaned |
| Battery voltage is low - Low battery charging, charge as required |
| Discharged or worn battery - Replace or charge as required |
| Starter motor is damaged - Replace or repair starter |
| Wiring harness is disconnected or improperly connected - Check wiring harness and reconnect properly |
| Transmission Troubleshooting |
| Difficulty shifting gears |
| Worn or misadjusted clutch - Adjust or replace the clutch |
| Stuck or damaged gear shift linkage - Replace or repair the shift linkage |
| Shift forks are damaged or worn - Change defective shift forks |
| Defective gearshift mechanism - Replace defective components |
| Lack of transmission oil pressure |
| Oil level is insufficient - Fill up the transmission oil |
| Transmission fluid filter clogging (if fitted) - Change or service the transmission fluid filter |
| Relief valve is faulty - Replace the valve |
| Transmission makes excessive noise |
| Cracked or worn bearings - Faulty bearings should be replaced |
| Insufficient oil supply - Check transmission oil level and add oil as required |
| Dirty transmission fluid - Change transmission fluid |
| Worn gears or improper backlash - Set backlash properly or change the gears |
| Bent or worn shift forks - Replace defective shift forks |
| Seals or gaskets are damaged - Change defective gaskets or seal |
| Transmission case is cracked - Replace case or transmission assembly |
| Hydraulics Troubleshooting |
| Hydraulic system overheated |
| Hydraulic system pressure is not set correctly - Set the hydraulic pressure as required |
| Main relief valve malfunction or incorrect adjustment - Adjust or change relief valve |
| Hydraulic fluid is contaminated - Fill up with new hydraulic fluid |
| Air enters in hydraulic system - Inspect the suction pipe, fittings, and pump seals |
| Low hydraulic system pressure |
| Not enough hydraulic fluid in the system - Need to add fluid |
| Dirty hydraulic oil filter - Clean or change hydraulic filter |
| Hydraulic pump is faulty - Check pump capacity and change if necessary |
| Hydraulic spool valve block is not set properly or defective - Replace or set correctly |
| Hydraulic cylinder is not working - Check cylinder parts for wear or damage and replace if necessary |
| Hydraulic piping leaks - Identify leaks in the system and repair it |
| 3-point hitch lifts slowly or won't lift |
| Hydraulic fluid level is insufficient - Add fluid to the hydraulic system |
| Cold oil in hydraulic system - Wait for oil to warm up |
| Hydraulic fluid filter is dirty - Change the hydraulic filter element or service if required |
| Hydraulic pump not working - Test the pump performance and change pump if required |
| Main relief valve is faulty or misadjusted - Adjust or replace the relief valve |
| Hydraulic control valve is defective or set improper - Adjust properly or change |
| Hydraulic cylinder malfunction - Inspect the hydraulic cylinder parts for damage or wear and replace if required |
| Loose or damaged suction line - Tighten or replace |
| 3-point hitch won't drop or drops slowly |
| Hydraulic control valve is defective or set improper - Change or set correctly |
| Faulty hydraulic cylinder - Inspect cylinder parts for wear or damage and replace if required |
| Worn lift arm shaft - Change the shaft |
| Defective mechanical parts of the hitch - Change damaged or worn hitch parts |
| Hitch jerks when lift or lower |
| Aeration in hydraulic system - Inspect the suction pipe, fittings, and pump seals |
| Dirty hydraulic oil - The oil must be changed |
| Faulty hydraulic oil pump - Check pump capacity and change if necessary |
| Hydraulic spool valve block is faulty or out of adjustment - Replace or adjust correctly |
| Hydraulic cylinder is not working - Inspect cylinder parts for wear or damage and replace if required |
| Steering System Troubleshooting |
| Heavy steering |
| Steering column is worn or incorrectly mounted - Change the steering column or mount it correctly |
| Air leaks in steering system - Bleed the system of air |
| Incorrect toe-in - Adjust toe-in wheels properly |
| Improper tire pressure - Check the pressure and inflate tires as required |
| Steering pump malfunction - Repair or change steering pump |
| Defective or worn hydrostatic steering unit - Replace or repair steering unit as required |
| Relief valve malfunction or seizing - Inspect relief valve and replace if necessary |
| Steering fluid insufficient - Check and refill steering fluid |
| Steering system has oil leaks - Retighten steering hose and pipe connections |
| Excessive steering wheel free play |
| Worn steering column coupling or shaft - Replace faulty component |
| Hydrostatic steering unit is defective or worn - Repair or replace the steering unit |
| Damaged hydraulic steering pump - Install a new steering pump |
| Worn or faulty steering linkage or tie-rod ends - Change damaged part |
| Front wheels wander to left or right |
| Improper tire pressure - Check the pressure and inflate tires as required |
| Improper toe-in - Check toe-in and correct |
| Steering linkage or tie-rod ends are worn - Change failed part |
| Hydrostatic steering unit has wear or malfunction - Inspect and replace as required |
| Steering cylinder is faulty - Repair or replace hydraulic steering cylinder |
| Defective or improperly adjusted front hub bearings - Change or adjust bearings correctly |
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| Farm Tractors Technical Specifications |
