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Home / Farm Tractors / Kubota Tractors / Kubota L345

Kubota L345 Troubleshooting

The Kubota L345 is a two-wheel drive (L345F) or four-wheel drive (L345DT) compact utility tractor. This model was manufactured between 1978 and 1985. The components of Kubota L345 driveline system: a 90.7 cu.in (1.5 L) Kubota V1501-A vertical 4-cycle four cylinder water-cooled diesel engine and sliding gear transmission with 8 forward and 2 reverse gears.

The engine has a cylinder bore of 3.01" (76 mm), piston stroke of 3.23" (82 mm), and rated power of 34 hp (25.5 kW). Max. forward speed - 13.7 mph (22 km/h), maximum reverse speed - 6.7 mph (10.8 km/h).

The open center hydraulic system used a gear pump with rated fluid flow of 6.4 gal/min (24.2 l/min). The hydraulic pressure is 155 bar (2250 psi). The Kubota L345 was equipped with a manual or power assist steering, wet disc brakes, 6.00x16 front tires, and 13.6x28 rear tires. The wheelbase is 76.6 in (1940 mm). The tractor is compatible with Kubota L1720 loader with lift capacity to maximum height of 1495 lbs (680 kg).

Engine Troubleshooting
Engine won't start or difficult to start
Fuel filter clogging - Clean the filter or install new filter element
The fuel shut-off valve is closed - Open fuel shut-off valve
Air in fuel system - Air-bleed fuel system
Fuel injectors are clogged or faulty - Change fuel injectors
Fuel injection pump is broken - Repair or install a new fuel pump
Poor engine compression - Check and change damaged parts
Diesel stalls while running
Engine is not fully warmed up - Warm up engine as required
Air in fuel pipes - Bleed fuel pipes
Improper fuel injection - Fuel injection settings required
Clogged fuel filter element - Replace filter element
Fuel injectors are damaged or dirty - Test fuel injectors and change if necessary
Diesel engine stops after starting
Incorrectly set fuel injection pump timing - Fuel injection pump timing adjustment needs to be corrected
Fuel filter is dirty - Filter maintenance required
Fuel injector nozzles are dirty or defective - Test injector nozzles and replace as required
Fuel injection pump is not operating properly - Replace injection pump or repair it
Dirty air cleaner - Air cleaner maintenance required
Engine stops while idling
Improperly adjusted low idle speed - Need to adjust idle speed
Faulty fuel injection pump - Rebuild or change fuel pump
Fuel injector nozzles are faulty - Service or replace nozzles if required
Valve clearance is not correct - Adjust valve clearance according to specifications
Engine overheats
Lack of coolant in cooling system - Fill cooling system to proper level. Any leaks must be repaired
Cooling system is dirty or cooling components are damaged - Change faulty components or flush the cooling system
Not enough engine oil - Checking oil level and add if necessary
Unadjusted fan belt tension or worn belt - Adjust correctly or install new belt
Defective or wrong type of thermostat - Check and change if necessary
Poor engine power
Fuel injectors are damaged or dirty - Test fuel injectors and change if necessary
Incorrect fuel injection pressure - Adjust to proper pressure
Clogged air filter - Change or service air filter element
Oil filter element clogging - Clean or replace engine oil filter element
Engine overloaded - Reduce load or shift to lower gear
Incorrect valve clearance - Check and adjust
Improperly adjusted low idle speed - Need to adjust idle speed
Fuel hoses or pipes are dirty - Clean fuel system hoses and pipes
Engine losing compression: Valves are faulty or leaking - Change the valves
Abnormal engine noise or knocking
Timing of fuel injection pump is not adjusted - Adjust injection timing
Clogged or defective injector nozzles - Change or clean injector nozzles
Low engine oil level - Fill up the engine oil
Engine is cold - Warm up the engine as required
Worn main bearings or crankshaft - Worn parts replacement required
Piston rings are worn or broken - Piston rings need to be replaced
Loose flywheel bolts - Inspect flywheel bolts and tighten properly
Engine consuming too much oil
Oil leaks: Seals or gaskets are defective - To repair leaks, replace worn parts
Crankcase oil too light - Use proper viscosity oil
Worn or stuck piston rings - Change the piston rings as required
Valve guides and stems are worn - Replace defective valves
Cylinder liners or pistons are scuffed - Check pistons and liners, change as required


Electrical System Troubleshooting
Battery cannot be charged
Battery is defective - Change the battery
Damaged battery wiring harness - Inspect wiring for damage, replace or repair
Battery terminals and cables are loose or corroded - Clean or tighten cables and terminals
Improper belt tension adjustment or damaged belt - Adjust belt tension correctly or replace belt
Starter cranks slowly
Low battery voltage - Battery needs to be recharged
Battery will not hold charge - Battery needs to be serviced or replaced
Bad battery electrical wire harness - Check wires for malfunctions, repair or replace
Battery terminals and cables are loose or corroded - Cables and terminals must be tightened or cleaned
Starter will not crank
Battery voltage is low - Battery is drained, recharge it
Drained or defective battery - Replace or charge as required
Damaged starter motor - Starter needs to be replaced
Disconnected or incorrectly connected wiring harness - Inspect wiring harness and reconnect it as required

Transmission Troubleshooting
Hard shifting
Worn or misadjusted clutch - Clutch adjustment or replacement required
Damaged or loose gear shift linkage - Change defective shift linkage
Shift forks are worn or damaged - Change defective shift forks
Gear shifting mechanism is worn - Change worn components
Transmission fluid pressure is insufficient
Low transmission fluid level - Check and refill the transmission fluid
Clogged transmission fluid filter element (if fitted) - Change or clean the transmission fluid filter
Relief valve sticking - Install a new valve
Transmission is excessively noisy
Cracked or worn bearings - Faulty bearings should be replaced
Insufficient oil supply - Correct the transmission oil level
Contaminated transmission fluid - Transmission fluid must be changed
Damaged gears or improper backlash - Change worn gears or set backlash correctly
Shift forks are worn or damaged - Replace defective shift forks
Transmission fluid leaks
Gaskets or seals are broken - Install new gaskets or seal
Transmission case is cracked - Replace case or transmission assembly


Hydraulics Troubleshooting
Hydraulic system is overheated
Improper hydraulic pressure adjustments - Adjust it correctly
Unadjusted or defective main relief valve - Adjust relief valve or change if required
Hydraulic fluid contamination - Change hydraulic fluid
Air enters in hydraulic system - Check the suction line, pump seals, and fittings
Low hydraulic fluid pressure
Lack of hydraulic oil - Add oil to the hydraulic system
Hydraulic oil filter element clogging - Clean the hydraulic filter or install new filter element
Hydraulic pump is faulty - Test the pump flow rate and change pump if required
Hydraulic spool valve block is not set properly or defective - Adjust correctly or replace
Hydraulic cylinder malfunction - Check cylinder parts for wear or damage and replace if necessary
Hydraulic lines are leaking - Identify leaks in the system and repair it
Hitch fails to lift or lifts slowly
Hydraulic fluid level is insufficient - Fill the hydraulic system with oil
Cold fluid in hydraulic system - Wait for fluid to warm up
Hydraulic fluid filter element is dirty - Hydraulic filter maintenance required
Hydraulic pump is faulty - Check the pump capacity and replace pump if required
Unadjusted or defective main relief valve - Replace or set up the relief valve
Hydraulic spool valve is defective or set improper - Adjust properly or replace
Hydraulic cylinder malfunction - Check cylinder components for wear or damage and change if necessary
Suction pipe is broken or loose - Tighten the pipe or replace it
Three-point hitch dropping is too slow or cannot be dropped
Hydraulic spool valve is defective or set improper - Replace or adjust properly
Hydraulic cylinder malfunction - Check the hydraulic cylinder parts for damage or wear and replace if necessary
Hitch rock shaft is damaged - Change the shaft
Damaged mechanical components of the hitch - Change faulty or worn hitch components
Hitch lowering or lifting is not smoothly
Aeration in hydraulic system - Inspect the pump seals, suction line, and fittings
Hydraulic oil is contaminated - Fill up with fresh hydraulic oil
Hydraulic pump is faulty - Test pump flow rate and replace pump if required
Hydraulic spool valve is defective or set improper - Change or adjust properly
Hydraulic cylinder is faulty - Inspect cylinder parts for wear or damage and replace if required

Steering System Troubleshooting
Steering wheel turns hard
Steering column is defective or incorrectly installed - Steering column must be installed correctly or replaced
Air trapped in the steering system - Bleed the steering system
Toe-in adjustment is incorrect - Adjust toe-in correctly
Improper tire pressure - Check the pressure and inflate tires as required
Defective hydraulic steering pump - Check the hydraulic steering pump and change if necessary
Power steering valve has wear or malfunction - Repair or replace the steering valve
Faulty steering box parts - Change defective steering box components
Insufficient steering fluid - Fill up the steering fluid
Steering system oil leak - Retighten steering hose and pipe connections
Excessive steering wheel play
Steering column shaft or coupling has maximum wear - Replace faulty component
Worn or damaged power steering valve - Repair or change the steering valve
Worn steering box components - Replace defective parts of power steering box
Defective hydraulic steering pump - Replace or repair steering pump
Worn or faulty steering linkage or tie-rod ends - Change damaged part
Tractor is pulling to right or left
Improper tire pressure - Check the pressure and inflate tires as required
Toe-in adjustment is incorrect - Adjust toe-in properly
Steering tie-rod ends or linkage are worn - Change damaged component
Damaged steering box parts - Defective power steering box components must be replaced
Worn or defective power steering valve - Repair or replace the steering valve
Front hub bearings are incorrectly adjusted or worn - Change or adjust bearings correctly

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