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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
Engine is overheated
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
Engine noise or knocking
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
High oil consumption
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
Starter cranks slow
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
Starter doesn't crank
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
Transmission oil leaking
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



Farm Tractors Technical Specifications
JD 1026R JD 3650 JD 6400 JD 7810
FORD 1320 FORD 2810 FORD 3930 FORD 5600
MF 250 MF 690 MF 3060 MF 6180
NH TC48DA NH M100 NH T7550 NH 8560
CASE IH 495 CASE IH 1255XL CASE IH 2140 CASE IH 2294