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Kubota L305 Troubleshooting
The
Kubota L305 is a compact utility tractor from L-series. This model was
manufactured between 1979 and 1985. The Kubota L305 tractor is equipped with
Kubota D1301-A vertical 4-cycle 3-cylinder diesel engine.
A 79.3 cubic inches (1.3 L) engine has a cylinder bore of 3.23" (82 mm),
piston stroke of 3.23" (82 mm), and rated power of 30 hp (22.5 kW). The
mechanical transmission includes a dry single-plate clutch and sliding
mesh gearbox with 8 forward and 2 revers gears. Max. forward speed -
12.7 mph (20.4 kph), maximum reverse speed - 6.2 mph (10.1 kph).
The open center hydraulic system includes a gear pump with a flow rate
of 6.4 gpm (24.2 lpm). The hydraulic pressure is 155 bar (2250 psi). The
L305F tractors (2WD) are equipped with 7.00x16 front tires and 12.4x24
rear tires. The 8.3x16 front tires and 13.6x24 rear tires are used for
L305DT tractors (4WD). The wheel base is 72.8" (1840 mm). The Kubota
L305 is compatible with Kubota L1720 front end loader with lift capacity
to full height of 1495 lbs (680 kg).
| Engine Troubleshooting |
| Engine is not starting or hard starting |
| Fuel filter is clogged - Clean or change the filter |
| Closed fuel supply valve - Open supply valve to inject fuel |
| Water, dirt, or air in fuel system - Drain, flush, fill, and bleed system |
| Fuel injectors are clogged or faulty - Check fuel injectors and replace if required |
| Fuel injection pump is damaged - Replacement or repair required |
| Bad compression - Check cylinder block and replace worn parts |
| Engine shuts off unexpectedly during operation |
| Coolant temperature is low - Normalize the temperature by warming up the engine |
| Air in fuel system - Air-bleed fuel system |
| Improper fuel injection - Fuel injection settings required |
| Fuel filter clogging - Change filter element |
| Fuel injectors are damaged or dirty - Change fuel injectors |
| Engine starts but then shuts off |
| Fuel injection pump timing is incorrect - Fuel pump timing settings need to be corrected |
| Dirty fuel filter element - Change the filter element |
| Fuel injector nozzles fault - Change or clean injector nozzles |
| Fuel injection pump is damaged - Change or repair the pump |
| Air cleaner is clogged - Install new cleaner element or replace it |
| Engine stalls at low idle speed |
| Incorrectly set low idle speed - Correct low idle settings |
| Fuel injection pump is broken - Rebuild or replace pump |
| Fuel injector nozzles fault - Check and change nozzles as required |
| Valve clearance is out of adjustment - Adjust valve clearance |
| Engine coolant is insufficient - Fill the cooling system. Repair any leaks if necessary |
| Cooling system is dirty or cooling components are damaged - Change faulty components or flush the cooling system |
| Not enough engine oil - Check oil level and add oil as required |
| Incorrect fan belt tension or broken belt - Adjust properly or change the belt |
| Thermostat is defective - Replace the thermostat |
| Fuel injectors are damaged or dirty - Inspect fuel injectors and replace if necessary |
| Fuel injection pressure is incorrect - Test fuel injection pressure and adjust it correctly |
| Air filter is clogged - Replace or service air filter element |
| Clogged oil filter - Clean or change engine oil filter |
| Engine overload - Change to lower gear or reduce load |
| The valve clearance is incorrect - Correct valve clearance |
| Low idle speed set incorrectly - Correct low idle settings |
| Dirt in the fuel pipes or hoses - Fuel pipes and hoses need to be cleaned |
| Engine compression is insufficient: Leaking or faulty valves - Change the valves |
| Engine knocking sound or abnormal noise |
| Unadjusted fuel injection pump timing - Check the fuel injection pump timing setting |
| Clogged or defective injector nozzles - Service or replace nozzles if required |
| Engine oil level is insufficient - Fill the crankcase with engine oil |
| Engine is not fully warmed up - Warm up the engine as required |
| Crankshaft or main bearings are worn out - Repair or replace defective parts |
| Broken or defective piston rings - Install new piston rings |
| Loose flywheel bolts - Inspect flywheel bolts and tighten properly |
| Oil leaks: Seals or gaskets are wearing excessively - Install new components |
| Improper oil viscosity - Fill up with the correct oil viscosity |
| Stuck or worn piston rings - Have piston rings replaced |
| Damaged valve guides or valve stems - Replace the valves |
| Pistons or cylinder liners are scuffed - Inspect liners and pistons, change as necessary |
| Electrical System Troubleshooting |
| Battery is not charging |
| Faulty cell in battery - Battery change required |
| Damaged battery wiring harness - Inspect wiring for damage, replace or repair |
| Loose or corroded terminals and cables - Service or tighten battery terminals and cables |
| Defective belt or improperly adjusted belt tension - Change belt or adjust belt tension properly |
| Low battery output voltage - Charge the battery |
| Battery is draining quickly - Service or replace the battery |
| Damaged battery cable harness - Check electrical cables for damage, repair or replace |
| Loose or corroded battery cables and terminals - Clean or tighten terminals and cables |
| Starter motor is not working |
| Low battery output voltage - Low battery charging, charge as required |
| Drained or defective battery - Need to charge or replace the battery |
| Starter motor failure - Starter should be replaced |
| Incorrectly connected or disconnected wires - Check battery wires and connect correctly |
| Transmission Troubleshooting |
| Hard shifts |
| Worn or incorrectly adjusted clutch - Clutch needs to be replaced or adjusted |
| Gear shift linkage is stuck or damaged - Change or repair shift linkage |
| Worn or damaged shift forks - Replace defective shift forks |
| Worn gear shift mechanism - Replace worn components |
| Transmission oil pressure is insufficient |
| Insufficient oil supply - Check transmission oil level and add oil as required |
| Transmission oil filter clogging (if fitted) - Replace or service transmission oil filter |
| Faulty relief valve - Replace relief valve as required |
| Transmission is making noise |
| Damaged or worn bearings - Bearings replacement required |
| Not enough oil in transmission - Fill up the transmission oil |
| Transmission fluid contamination - Change transmission fluid |
| Improper backlash or damaged gears - Change the gears or adjust backlash correctly |
| Shift forks are damaged or worn - Replace the shift forks |
| Transmission fluid leakage |
| Worn gaskets or seals - Install new components |
| Cracked transmission case - Install a new transmission case |
| Hydraulics Troubleshooting |
| Hydraulic system is overheated |
| Incorrect hydraulic pressure adjustments - Adjust correctly |
| Defective or misadjusted main relief valve - Adjust relief valve or change if required |
| Dirty hydraulic fluid - The fluid must be changed |
| Air in hydraulic system - Check the pump seals, suction line, and fittings |
| Hydraulic fluid pressure is insufficient |
| Hydraulic fluid level is low - Need to add fluid |
| Hydraulic oil filter is dirty - Change the hydraulic filter element or service if required |
| Damaged hydraulic oil pump - Test the pump performance and change pump if required |
| Hydraulic spool valve block is defective or set improper - Replace or adjust correctly |
| Hydraulic cylinder malfunction - Inspect cylinder components for damage or wear and change if required |
| Hydraulic lines are leaking - Identify leaks in the system and repair it |
| 3-point hitch does not raise or raises very slowly |
| Hydraulic fluid level is insufficient - Fill the hydraulic system with oil |
| Cold hydraulic oil - Warm up the oil |
| Hydraulic oil filter clogging - Clean or change hydraulic filter |
| Hydraulic pump is faulty - Check hydraulic pump flow and replace pump if necessary |
| Main relief valve malfunction or incorrect adjustment - Adjust relief valve or change if required |
| Defective or incorrect setting hydraulic control valve block - Change or adjust properly |
| Hydraulic cylinder malfunction - Inspect cylinder components for wear or damage and change if required |
| Broken or loose suction line - Retighten or change |
| Hitch not dropping or hitch drops slowly |
| Hydraulic spool valve block is faulty or out of adjustment - Change or adjust properly |
| Hydraulic cylinder is defective - Check cylinder components for wear or damage and change if necessary |
| Lift arm shaft is worn - Replace the shaft |
| Mechanical parts of the hitch are damaged - Replace worn or faulty hitch components |
| Hitch is lowered or raised jerkily |
| Air leaks in hydraulic system - Check the suction line, pump seals, and fittings |
| Dirty hydraulic fluid - The fluid must be changed |
| Faulty hydraulic oil pump - Check pump performance and change it if necessary |
| Hydraulic spool valve block is defective or set improper - Replace or adjust properly |
| Defective hydraulic cylinder - Inspect the hydraulic cylinder parts for damage or wear and replace if required |
| Steering System Troubleshooting |
| Stiff steering |
| Steering column is defective or incorrectly installed - Steering column must be installed correctly or replaced |
| Aeration in steering system - Bleed air from system |
| Improper toe-in - Adjust toe-in properly |
| Tires are incorrectly inflated - Inflate as required |
| Steering pump stopped working - Check the steering pump and replace if necessary |
| Power steering valve has wear or malfunction - Repair or replace the steering valve |
| Damaged steering box parts - Defective parts of power steering box must be replaced |
| Lack of steering fluid - Need to add steering oil |
| Oil leakage in the steering system - Retighten steering hose and line connections |
| Steering wheel has too much free-play |
| Steering column shaft or coupling is worn out - Replace defective component |
| Power steering valve is defective or worn - Inspect and change as required |
| Damaged steering box parts - Change defective steering box parts |
| Steering pump not working - Steering pump needs to be repaired or replaced |
| Worn or faulty steering tie-rod ends or linkage - Replace damaged component |
| Tractor pulls to left or right |
| Tire pressure is low - Tires need to be inflated |
| Toe-in adjustment is incorrect - Adjust toe-in properly |
| Worn or faulty steering tie-rod ends or linkage - Replace failed part |
| Damaged steering box parts - Replace defective parts of power steering box |
| Power steering valve has wear or damage - Check and replace as required |
| Front hub bearings are damaged or incorrectly adjusted - Replace or adjust the bearings correctly |
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| Farm Tractors Technical Specifications |
