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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 |