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Kubota L285 Troubleshooting
The
Kubota L285 is a 2-wheel drive compact utility tractor. This model was
manufactured from 1975 to 1981. The Kubota L285 driveline consists of a 90.7
cu.in (1.5 L) Kubota V1501-A vertical 4-cycle four-cylinder naturally aspirated
diesel engine with a rated power of 30 hp (22.4 kW) at 2400 rpm, and sliding
gear transmission with 8 forward and 2 reverse gears.
The maximum travel speed (forward and reverse): 14.3 mph (22 km/h) / 9.6
mph (15.5 km/h). 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
2250 psi (155 bar).
The Kubota L285 is equipped with a manual steering system, wet disc
brakes, 5.00x15 front tires, and 11.2x24 rear tires. The wheelbase is 67
in (1700 mm). The tractor is compatible with Kubota L1200 front end
loader.
| Engine Troubleshooting |
| Engine doesn't start or hard to start |
| Fuel filter clogging - Clean the filter or install new filter element |
| Fuel supply valve is closed - Open fuel supply valve |
| Air in fuel pipes - Bleed fuel pipes |
| Dirty or damaged injectors - Inspect fuel injectors and replace if necessary |
| Fuel injection pump damage - Repair or replace injection pump |
| Engine has bad compression - Inspect cylinder block and change worn parts |
| Engine stops running unexpectedly |
| Engine not warmed up - Normalize the temperature by warming up the engine |
| There is air in the fuel system - Bleed the system |
| Uneven fuel injections - Repair or adjustment |
| Fuel filter is dirty - Change filter element |
| Clogged fuel injectors - Change fuel injectors |
| Diesel engine stops after starting |
| Unadjusted fuel injection pump timing - Fuel injection pump timing adjustment needs to be corrected |
| Fuel filter plugging - Replace filter element |
| Fuel injector nozzles are clogged or faulty - Service or replace injector nozzles |
| Fuel injection pump is not operating properly - Change or repair the pump |
| Air cleaner element clogging - Replace or service air cleaner element |
| Incorrect low idle setting - Correct low idle adjustment |
| Fuel injection pump is defective - Rebuild or change fuel pump |
| Damaged or clogged injector nozzles - Service or replace nozzles if required |
| Excessive valve clearance - Adjustment procedure required |
| Low engine coolant - Fill the radiator to the required level. Check the components of cooling system |
| Cooling system components are defective or system is clogged - Service the cooling system or change faulty parts |
| Insufficient engine oil - Checking oil level and add if necessary |
| Worn fan belt or incorrect belt tension - Adjust as required or replace belt |
| Defective or wrong type of thermostat - Check thermostat, replace if necessary |
| Dirty or damaged injectors - Clean or replace fuel injectors |
| Improper fuel injection pressure - Repair or replace injection pump |
| Clogged air filter - Service or change air filter |
| Oil filter is dirty - Change or service engine oil filter |
| Diesel engine is overloaded - Load reducing required |
| Improper valve clearance - Have it adjusted |
| Incorrect low idle setting - Need to adjust idle speed |
| Fuel hoses or pipes are clogged - Clean fuel system pipes and hoses |
| Engine compression is insufficient: Valves are broken or leaking - Valves need to be replaced |
| Engine knocking sound or abnormal noise |
| Timing of fuel injection pump is not adjusted - Adjust injection timing |
| Dirty or defective injector nozzles - Change or clean injector nozzles |
| Engine oil insufficient - Add oil to the engine crankcase |
| Engine is not warmed up to the required temperature - Warm up engine as required |
| Main bearings or crankshaft are worn out - Change or repair worn components |
| Piston rings are damaged or broken - Install new piston rings |
| Flywheel screws are loose - Tighten the screws firmly |
| Diesel engine using too much oil |
| Oil leaking: Worn seals or gaskets - Replace defective parts |
| Crankcase oil too light - Use oil of correct viscosity |
| Stuck or defective piston rings - Install new piston rings |
| Valve stems or guides are damaged - Replace defective valves |
| Cylinder liners or pistons are scuffed - Check pistons and liners, replace as required |
| Electrical System Troubleshooting |
| Battery is not charging |
| Worn-out battery - Replace the battery |
| Bad battery electrical wire harness - Check wires for malfunctions, repair or replace |
| Corroded or loose cables and terminals - Cables and terminals must be tightened or cleaned |
| Worn belt or improperly adjusted belt tension - Adjust belt tension correctly or replace belt |
| Low battery output - Battery needs to be recharged |
| Battery drains quickly - Service or change the battery |
| Bad battery electrical wire harness - Check wires for malfunctions, repair or replace |
| Loose or corroded terminals and cables - Tighten or service terminals and cables |
| Low battery power - Recharge the battery |
| Discharged or defective battery - Charge or replace the battery |
| Damaged starter motor - Starter needs to be replaced |
| Wiring harness is disconnected or improperly connected - Check wiring harness and reconnect properly |
| Transmission Troubleshooting |
| Difficult to shift gears |
| Failure or improper clutch adjustment - Change or adjust clutch |
| Damaged or loose gear shift linkage - Replace or repair the shift linkage |
| Damaged or worn shift forks - Shift forks need to be replaced |
| Defective gearshift mechanism - Replace defective components |
| Lack of transmission oil pressure |
| Oil level is insufficient - Add transmission oil as required |
| Transmission oil filter element is clogged (if equipped) - Change or clean the transmission oil filter |
| Relief valve sticking - Change relief valve |
| Transmission is making noise |
| Cracked or worn bearings - Replace the bearings |
| Not enough fluid in transmission - Fill the transmission housing with fluid |
| Dirty transmission fluid - Transmission fluid must be changed |
| Gears are worn or backlash is improper - Replace gears or adjust backlash properly |
| Bent or worn shift forks - Replace the shift forks |
| Seals or gaskets are damaged - Change defective gaskets or seal |
| Cracked transmission housing - Housing needs to be replaced |
| Hydraulics Troubleshooting |
| Excessive hydraulic system heat |
| Incorrect pressure in hydraulic system - Changing the system pressure |
| Unadjusted or defective main relief valve - Adjust the valve or replace if necessary |
| Hydraulic oil is contaminated - Fill up with fresh hydraulic oil |
| Air trapped in the hydraulic system - Check the pump seals, suction pipe, and fittings |
| Hydraulic oil pressure is insufficient |
| Hydraulic fluid level is insufficient - Add fluid to the hydraulic system |
| Hydraulic fluid filter element is dirty - Change hydraulic filter element or clean if necessary |
| Defective hydraulic pump - Test the pump flow rate and change pump if required |
| Defective or not adjusted hydraulic spool valve - Adjust correctly or replace |
| Hydraulic cylinder failure - Check cylinder components for wear or damage and change if necessary |
| Leakage in hydraulic lines - Inspect hydraulic system for leaks and repair it |
| Hitch fails to lift or lifts slowly |
| Not enough hydraulic fluid in the system - Check and refill the hydraulic fluid |
| Hydraulic oil is too cold - Allow oil to warm |
| Hydraulic oil filter element is dirty - Clean the hydraulic filter element or replace if necessary |
| Hydraulic pump failure - Check the pump capacity and replace pump if required |
| Unadjusted or defective main relief valve - Adjust the valve or replace if necessary |
| Hydraulic control valve is not set properly or defective - Adjust properly or change |
| Hydraulic cylinder is broken - Check cylinder components for wear or damage and change if necessary |
| Suction pipe is broken or loose - Tighten the pipe or replace it |
| Hitch drops too slowly or can't drop |
| Hydraulic spool valve is defective or set improper - Adjust properly or change |
| Hydraulic cylinder malfunction - Inspect cylinder components for damage or wear and change if required |
| Worn hitch rock shaft - Change the shaft |
| Internal mechanical malfunction with hitch - Replace worn or faulty hitch components |
| Hitch raises or lowers not smoothly |
| Hydraulic system sucks air - Inspect the pump seals, suction line, and fittings |
| Contaminated hydraulic oil - Change hydraulic oil |
| Hydraulic pump malfunction - Test pump flow rate and replace pump if required |
| Hydraulic control valve is not set properly or defective - Change or adjust correctly |
| Hydraulic cylinder is defective - Check cylinder components for wear or damage and change 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 |
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| Farm Tractors Technical Specifications |
