________________________________________________________________________________________
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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
