Home / Farm Tractors / Kubota Tractors / Kubota L185

Kubota L185 Troubleshooting

The Kubota L185 is a 2WD or 4WD (L185DT) compact utility tractor. This model was manufactured from 1977 to 1982. The Kubota L185 tractor is equipped with a 45.3 cubic inches Kubota Z751 two-cylinder liquid cooled diesel.

The engine has a cylinder bore of 3.0" (76 mm), piston stroke of 3.22" (82 mm), and rated power of 15 hp (11.2 kW). The sliding gear transmission consists of a dry clutch and gearbox with 8 forward and 2 reverse gears. Max. forward speed - 13.1 mph (21 kph), max. reverse speed - 9 mph (14.5 kph). The open center hydraulic system includes a gear pump with a flow of 6.2 gal/min (23.5 l/min).

The main relief pressure is 147 bar (2130 psi). The 2-wheel drive models are equipped with 4.00x15 front tires and 9.5x24 rear tires. The 6.00x14 front tires and 9.5x24 rear tires are used for tractors with 2-wheel drive (L185DT). The wheelbase is 60 inches (1520 mm). The Kubota L185 tractor is compatible with a Kubota L1200 front end loader.

Engine Troubleshooting
Engine won't start or difficult to start
Dirty fuel filter element - Clean the filter or install new filter element
No fuel injection - Open fuel cock to inject fuel
Fuel-line is leaking air - Retighten clamps, replace defective pipes
Clogged fuel injectors - Service or change fuel injectors
Fuel injection pump malfunctioning - Change or repair the pump
Poor compression - Check cylinder block and replace worn parts
Engine shuts off while driving
Engine not warmed up - Warm up engine as required
Air in fuel pipes - Bleed fuel pipes
Uneven fuel injections - Repair or adjustment
Fuel filter plugging - Change the filter element
Fuel injectors are defective or dirty - Change fuel injectors
Engine starts and then stalls
Incorrectly set fuel injection pump timing - Check and correct settings
Fuel filter is clogged - Clean the filter element
Fuel injector nozzles fault - Install new set of properly balanced nozzles
Fuel injection pump is damaged - Rebuild or install a new injection pump
Dirty air cleaner - Replace or service air cleaner element
Engine stalls while idle
Incorrectly set low idle speed - Adjust low idle speed
Fuel injection pump is faulty - Repair or change injection pump
Clogged or defective injector nozzles - Test injector nozzles and replace as required
Excessive valve clearance - Correct valve clearance needs to be set
Engine overheating
Insufficient coolant fluid - Fill cooling system to proper level. Check for coolant leaks
Cooling system components are failed or system is dirty - Replace faulty parts or service cooling system
Not enough engine oil - Add oil to the engine crankcase
Fan belt tension is improper or belt is defective - Adjust belt tension correctly or change it
Defective thermostat - Check and change if necessary
Engine power loss
Dirty or faulty injectors - Clean or replace fuel injectors
Incorrect fuel injection pressure - Adjust pressure to proper level
Dirty air filter - Change or replace air filter element
Oil filter element is dirty - Service or change engine oil filter element
Engine is under excessive load - Change to lower gear or reduce load
Incorrect valve clearance - Adjustment procedure required
Improperly adjusted low idle speed - Adjust low idling as recommended
Restricted fuel pipes or hoses - Fuel pipes and hoses need to be cleaned
Loss of compression: Leaking or faulty valves - Install new valves
Engine noise or knocking
Incorrectly set fuel injection pump timing - Fuel pump timing settings need to be corrected
Fuel injector nozzles fault - Test injector nozzles and replace as required
Engine oil level low - Need to add engine oil
Engine has not warmed up to the recommended temperature - Warm up the engine as required
Worn main bearings or crankshaft - Worn parts replacement required
Piston rings failure - Install new piston rings
Loose flywheel bolts - Check flywheel bolts and tighten properly
Engine oil consumption is too high
Oil leaking: Gaskets or seals can be faulty - Change to repair leaks
Oil viscosity is incorrect - Fill up with the proper oil viscosity
Piston rings are seized or worn - Change the piston rings as required
Valve stems and guides are worn - Replace the valves
Worn cylinder liners or pistons - Inspect pistons and liners, change as required

Electrical System Troubleshooting
Battery won’t charge
Bad cell in battery - Change the battery
Bad battery electrical wire harness - Check wires for malfunctions, repair or replace
Corroded or loose battery terminals and cables - Tighten or service cables and terminals
Damaged belt or incorrectly adjusted belt tension - Adjust belt tension correctly or change belt
Starter cranks slowly
Battery power is low - Charge the battery
Battery will not hold charge - Service battery or change it
Battery cable harness failure - Check battery electrical cable for defects, replace or repair
Loose or corroded cables and terminals - Clean or tighten cables and terminals
Starter is not working
Low battery capacity - Recharge the battery
Drained or faulty battery - Change or recharge battery
Starter motor is damaged - Repair or install a new starter
Disconnected or incorrectly connected cables - Need to reconnect cables correctly

Transmission Troubleshooting
Hard to shift gears
Clutch is unadjusted or worn - Adjust clutch or change if necessary
Gear shift linkage is stuck or worn - Change defective shift linkage
Bent or worn shift forks - Change defective shift forks
Faulty gear shifting mechanism - Faulty parts must be changed
Transmission oil pressure is insufficient
Not enough oil in transmission - Fill the transmission housing to proper oil level
Plugged transmission fluid filter (if equipped) - Change or clean the transmission fluid filter
Damaged relief valve - Change the valve
Transmission makes noise
Bearings are worn or broken - Bearings replacement required
Oil level is low - Add transmission oil as required
Contaminated transmission oil - Fill up with fresh transmission oil
Defective gears or incorrect backlash - Change the gears or adjust backlash correctly
Damaged or worn shift forks - Shift forks need to be replaced
Transmission oil leaks
Worn gaskets or seals - Gaskets or seal need to be replaced
Cracked transmission case - Install a new transmission case

Hydraulics Troubleshooting
Excessive hydraulic system heat
Improper pressure in hydraulic system - Adjust properly
Main relief valve failure or incorrect setting - Adjust the valve or replace if necessary
Dirty hydraulic oil - The oil must be changed
Air in hydraulic system - Inspect the pump seals, suction line, and fittings
Insufficient hydraulic fluid pressure
Lack of hydraulic fluid - Check and refill the hydraulic fluid
Dirty hydraulic oil filter - Clean or change hydraulic filter
Hydraulic pump malfunction - Check hydraulic pump flow and replace pump if necessary
Hydraulic control valve block is faulty or out of adjustment - Replace or set properly
Hydraulic cylinder is broken - Check the hydraulic cylinder parts for damage or wear and replace if necessary
Hydraulic lines are leaking - Detect leaks in hydraulic system and repair it
3-point hitch does not raise or raises very slowly
Hydraulic fluid level is low - Check and refill the hydraulic fluid
Hydraulic oil is too cold - Allow oil to warm
Dirty hydraulic oil filter - Install a new hydraulic filter element
Defective hydraulic pump - Check the pump capacity and replace pump if required
Defective or misadjusted main relief valve - Adjust or replace the relief valve
Hydraulic control valve block is faulty or out of adjustment - Replace or set correctly
Hydraulic cylinder is not working - Inspect cylinder parts for wear or damage and replace if required
Damaged or loose suction line - Tighten or change
Hitch does not lower or lowers very slowly
Hydraulic spool valve is not set properly or defective - Adjust correctly or replace
Hydraulic cylinder is not working - Inspect cylinder parts for wear or damage and replace if required
Hitch cross shaft is damaged - Replace the shaft
Damaged mechanical components of the hitch - Replace worn or faulty hitch parts
3-point hitch lifting or lowering is jerky
Aeration in hydraulic system - Check the pump seals, suction line, and fittings
Hydraulic fluid is contaminated - Fill up with new hydraulic fluid
Hydraulic pump is defective - Test pump performance and replace pump if necessary
Defective or incorrect setting hydraulic spool valve block - Replace or adjust correctly
Hydraulic cylinder is defective - Check the hydraulic cylinder parts for damage or wear and replace if necessary

Steering System Troubleshooting
Hard Steering
Steering knuckle or steering column is stuck - Inspect steering column and knuckle, replace worn parts
Steering gearbox components are worn - Replace defective components of steering gearbox
Faulty drag link or tie rod - Replace or repair
Insufficient lubrication in steering box - Need to lubricate the gearbox
Not adjusted toe-in alignment - Check and adjust toe-in
Tires are not correctly inflated - Inflate tires as necessary
Excessive steering wheel free play
Steering column bearing or shaft is worn - Change faulty parts
Steering linkage assembly is worn or loose - Repair or replace steering linkage
Worn steering gearbox bearings - Replace the bearings
Front wheel hub bearings or steering knuckles are worn - Change hub bearings or knuckles
Damaged or worn steering tie-rod ends - Change faulty part
Tractor pulls to right or left
Worn or loose steering linkage assembly - Repair or replace steering linkage
Defective steering knuckle bushing - Replace knuckle bushing
Uneven tire pressure - Inflate the tires properly
Toe-in adjustment is incorrect - Adjust toe-in 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