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Kubota L2850 Troubleshooting
The
Kubota L2850 is a 2WD or 4WD compact utility tractor from L-series. This model
was manufactured between 1985 and 1990. The Kubota L2850 tractor is powered by
105.7 cu.in (1.73 L) Kubota V1702-DI-A 4-cylinder vertical water-cooled diesel
engine with a rated power of 31 hp (23.1 kW) at 2800 rpm.
The Kubota L2850 is fitted with 2 transmission options: 8x7 partially
synchronized transmission, or Glide shift (GST) transmission with 8
forward and 8 reverse gears. The maximum forward speed - 13.1 mph (21.2
kph), maximum reverse speed - 10.7 mph (17.3 kph).
The open center hydraulic system includes a gear pump with a rated
capacity of 7.8 gallons per minute (29.5 liters per minute). The
hydraulic system pressure is 157 bar (2275 psi). The 2-wheel drive
models are equipped with 5.00x15 front tyres and 12.4x24 rear tyres. The
7.00x16 front tyres and 12.4x24 rear tyres fit 4-wheel drive tractors.
The wheel base is 68.3" (1730 mm).
The Kubota L2850 is compatible with the following attachments: a 72"
mid-mount 3-blade mower deck, BF500 loader with a lift capacity to full
height of 1102 lbs (500 kg), BL4520 backhoe with a max digging depth of
78" (1980 mm), and BL4530 backhoe with a max digging depth of 90" (2280
mm).
| Engine Troubleshooting |
| Engine is not starting or hard starting |
| Fuel filter clogging - Clean or replace the filter |
| Closed fuel supply valve - Open supply valve to inject fuel |
| Air trapped in fuel system - Bleed air |
| Dirty or damaged injectors - Inspect fuel injectors and replace if necessary |
| Faulty fuel injection pump - Change or repair the pump |
| Bad compression - Inspect cylinder block and replace worn components |
| Engine stops running while driving |
| Engine not warmed up - Normalize the temperature by warming up the engine |
| Air in fuel pipes - Bleed fuel pipes |
| Irregular fuel injection - Adjust fuel injection timing |
| Fuel filter is dirty - Install new filter element |
| Fuel injectors are defective or dirty - Check fuel injectors and replace if required |
| Diesel starts but then shuts off |
| Incorrectly set fuel injection pump timing - Check the fuel injection pump timing setting |
| Clogged fuel filter element - Replace filter element |
| Faulty fuel injector nozzles - Replace fuel injector nozzles |
| Fuel injection pump is faulty - Change pump or rebuild it |
| Clogged air cleaner - Service or replace the air cleaner |
| Engine stops at low idle speed |
| Incorrectly adjusted low idle speed - Adjust as required |
| Defective fuel injection pump - Repair or change injection pump |
| Clogged or damaged injector nozzles - Install a new set of well-balanced nozzles |
| Incorrect valve clearance - Need to adjust valve clearance |
| Lack of engine coolant - Refill to the correct level. Check for leaks or other malfunctions |
| Cooling system components are defective or system is clogged - Flush cooling system or change faulty components |
| Not enough engine oil - Checking oil level and add if necessary |
| Fan belt is damaged or belt tension is incorrect - Adjust belt tension correctly or replace it |
| Thermostat malfunction - Check and change if necessary |
| Diesel engine is losing power |
| Fuel injectors are damaged or dirty - Inspect fuel injectors and replace if necessary |
| Improper fuel injection pressure - Adjust to correct pressure |
| Air filter element is dirty - Replace or service air filter element |
| Oil filter is clogged - Change or clean engine oil filter element |
| Engine overload - Reduce engine load |
| Incorrect valve clearance - Adjust valve clearance |
| Incorrectly set low idle speed - Adjust low idling as recommended |
| Fuel pipes or hoses are clogged - Fuel hoses and pipes must be clean |
| Engine low compression: Valves are broken or leaking - Replace the valves |
| Fuel injection pump out of timing - Adjust the fuel injection pump timing correctly |
| Damaged or clogged injector nozzles - Change injector nozzles |
| Engine oil level is low - Check and refill engine oil |
| Engine has not warmed up to the recommended temperature - Warm up the engine as required |
| Crankshaft or main bearings wear - Install new parts |
| Defective or broken piston rings - Piston rings replacement required |
| The flywheel to crankshaft bolts are loose - Tighten bolts as required |
| Oil leakage: Damaged gaskets or seals - Replace worn parts to avoid leaks |
| Oil viscosity is incorrect - Fill up with the proper oil viscosity |
| Piston rings are stuck or worn - Piston rings replacement required |
| Valve stems or guides are damaged - Install new valves |
| Cylinder liners or pistons are worn - Inspect liners and pistons, fit new parts as necessary |
| Electrical System Troubleshooting |
| Battery is not charging |
| Bad cell in battery - Use a new battery |
| Battery wiring harness failure - Inspect electrical cables for defects, repair or replace |
| Loose or corroded battery cables and terminals - Service or tighten battery terminals and cables |
| Belt slipping or wrong belt tension adjustment - Adjust belt tension as required or change belt |
| Battery voltage is low - Charge the battery |
| Battery will not hold charge - Service charging system or install new battery |
| Battery electrical wire harness failure - Inspect wires for defects, change or repair |
| Corroded or loose cables and terminals - Tighten or clean cables and terminals |
| Battery voltage is low - Recharge the battery |
| Drained or faulty battery - Replace or charge as required |
| Starter motor is faulty - Starter needs to be replaced |
| Cables harness is improperly connected or disconnected - Inspect cables harness and reconnect it properly |
| Transmission Troubleshooting |
| Hard shifts |
| Failure or improper clutch adjustment - Clutch needs to be adjusted or changed |
| Gear shift linkage is damaged or loose - Replace or repair the shift linkage |
| Bent or worn shift forks - Replace defective shift forks |
| Faulty parts in the gear shifting mechanism - Change faulty parts |
| Insufficient transmission fluid pressure |
| Fluid level is low - Fill system with correct transmission fluid level |
| Transmission oil filter element is dirty (if fitted) - Change or service the transmission oil filter |
| Relief valve failure - Replace relief valve as required |
| Transmission makes excessive noise |
| Broken or worn bearings - Faulty bearings should be changed |
| Fluid level is low - Fill the transmission housing with fluid |
| Dirty transmission fluid - Transmission fluid must be changed |
| Worn gears or improper backlash - Replace gears or set backlash properly |
| Shift forks are worn or damaged - Change defective shift forks |
| Seals or gaskets are damaged - Install new components |
| Cracked transmission case - Install a new transmission case |
| Hydraulics Troubleshooting |
| Hydraulic system overheating |
| Hydraulic system pressure is incorrect - Hydraulic pressure needs to be set correctly |
| Faulty or incorrectly adjusted main relief valve - Adjust or change relief valve |
| Dirty hydraulic oil - The oil must be changed |
| Air trapped in the hydraulic system - Check the suction line, pump seals, and fittings |
| Hydraulic fluid pressure is low |
| Hydraulic fluid level is low - Fill the hydraulic system with oil |
| Hydraulic fluid filter is dirty - Clean the hydraulic filter or install new filter element |
| Hydraulic pump failure - Check hydraulic pump flow and replace pump if necessary |
| Hydraulic spool valve is faulty or out of adjustment - Replace or adjust correctly |
| Hydraulic cylinder failure - Inspect the hydraulic cylinder components for damage or wear and change if required |
| Leakage in hydraulic pipes - Identify leaks in the system and repair it |
| Hitch won't lift or lifts slowly |
| Not enough hydraulic fluid in the system - Need to add fluid |
| Cold hydraulic oil - Warm up the oil |
| Hydraulic fluid filter clogging - Install a new hydraulic filter element |
| Damaged hydraulic oil pump - Check pump capacity and change if necessary |
| Main relief valve malfunction or incorrect adjustment - Replace or set up the relief valve |
| Hydraulic spool valve is defective or set improper - Change or set correctly |
| Broken hydraulic cylinder - Check cylinder components for damage or wear and change if necessary |
| Damaged or loose hydraulic suction line - Tighten or change it |
| Hitch drops too slowly or can't drop |
| Hydraulic control valve is not set properly or defective - Change or set correctly |
| Hydraulic cylinder is not working - Check cylinder components for damage or wear and change if necessary |
| Worn lift arm shaft - Replace the shaft |
| Internal mechanical malfunction with hitch - Change damaged or worn hitch parts |
| 3-point hitch lifting or lowering is jerky |
| Air in hydraulic system - Check the suction pipe, fittings, and pump seals |
| Dirty hydraulic fluid - The fluid must be changed |
| Damaged hydraulic oil pump - Test the pump flow rate and install new pump if required |
| Hydraulic control valve block is not set properly or defective - Replace or set correctly |
| Hydraulic cylinder is defective - Check cylinder components for damage or wear and change if necessary |
| Steering System Troubleshooting |
| Steering wheel is hard to turn |
| Steering column is defective or improperly assembled - Change steering column or assemble properly |
| Aeration in steering system - Bleed the system of air |
| Improper toe-in - Adjust toe-in properly |
| Low tire pressure - Inflate the tires |
| Steering pump stopped working - Check the steering pump and replace if necessary |
| Worn or defective steering valve assembly - Inspect and change as required |
| Worn power steering box parts - Defective power steering box components must be replaced |
| Lack of steering fluid - Need to add steering oil |
| Steering system oil leak - Tighten the steering line and hose joints |
| Excessive free play of steering wheel |
| Worn steering column shaft or coupling - Replace defective part |
| Defective or worn steering valve assembly - Replace or repair steering valve as required |
| Damaged power steering box parts - Defective power steering box components must be replaced |
| Faulty steering pump - Check the steering pump and replace if necessary |
| Faulty or worn steering linkage or tie-rod ends - Replace failed part |
| Tractor pulls to right or left |
| Tire pressure is improper - Inflate the tires properly |
| Improper toe-in - Adjust toe-in properly |
| Steering linkage or tie-rod ends are defective - Replace damaged part |
| Damaged steering box parts - Repair power steering box |
| Steering valve assembly is worn or defective - Repair or replace the steering valve |
| Worn or incorrectly adjusted or worn front hub bearings - Change or adjust bearings correctly |
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| Farm Tractors Technical Specifications |
