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Kubota L3710 Troubleshooting

The Kubota L3710 is a Grand L10 series compact utility tractor. This model was manufactured from 1998 to 2002. The Kubota L3710 is powered by Kubota V1903-A four-cycle vertical 4-cylinder indirect injection diesel engine with a rated power of 36.6 Hp (27.3 kW) at 2600 rpm.

The Kubota L3710 was fitted with 3 transmission options: 8x8 Sync Shuttle fully synchronized transmission (FST), 8x8 (16x16 with creeper) Glide Shift transmission (GST), or 3-range hydrostatic transmission (HST). The maximum travel speed (forward/reverse): 14.4 mph (23.1 km/h) and 13.1 mph (21.1 km/h).

The open center hydraulic system includes a gear pump with a rated capacity of 7.8 gpm (29.5 lpm). The tractor is equipped with 8.3x16 front tyres and 13.6x24 rear tyres. The wheelbase is 71.1" (1805 mm). Compatible attachments for the Kubota L3710 tractor: a 72" mid-mount Kubota RC72-36A 3-blade mower deck with hydraulic lifting, 60" or 72" front-mount blades, 62" front-mount Kubota L62HD snow blower with hydraulic lift, Kubota LA681 front end loader with lift capacity to full height of 1500 lbs (680 kg), and Kubota BL4690 with a digging depth of 90.2" (2290 mm).

Engine Troubleshooting
Diesel will not start or hard to start
Fuel filter is clogged - Change filter element
Fuel supply valve is closed - Open fuel supply valve
Air in fuel lines - Bleed fuel lines
Fuel injectors are damaged or dirty - Service or change fuel injectors
Damaged fuel injection pump - Install a new fuel pump or repair
Poor compression - Inspect cylinder block and replace worn components
Engine stops running while driving
Engine is not preheated - Warm up the engine
There is air in the fuel system - Bleed the system
Uneven fuel injections - Repair or adjustment
Fuel filter is clogged - Clean the filter or install new filter element
Dirty or faulty injectors - Clean or replace fuel injectors
Engine starts but immediately shuts off
Timing of fuel injection pump is not adjusted - Fuel injection pump timing adjustment needs to be corrected
Fuel filter plugging - Service the filter
Clogged or damaged injector nozzles - Inspect injector nozzles and change if required
Fuel injection pump is damaged - Replace or rebuild injection pump
Air cleaner clogging - Replace or clean the air cleaner element
Engine stops at idle
Incorrectly adjusted low idle speed - Adjust as required
Fuel injection pump is not working correctly - Repair or install a new fuel pump
Fuel injector nozzles are defective or dirty - Replace fuel injector nozzles
Valve clearance is wrong - Adjust to proper valve clearance
Engine overheating
Lack of coolant in cooling system - The cooling system needs to be refilled. Check radiator and hoses for leaks
Cooling system components are defective or system is dirty - Replace faulty parts or service cooling system
Engine oil level low - Fill up the engine oil
Worn fan belt or improper belt tension - Adjust belt tension correctly or replace it
Thermostat malfunction - Install new thermostat
Reduced engine power
Faulty or dirty injectors - Check fuel injectors and replace if required
Fuel injection pressure is wrong - Correct the pressure settings
Air filter element clogging - Clean or replace the air filter element
Oil filter clogging - Replace or service engine oil filter
Engine overloaded - Shift to lower gear or reduce the load
Excessive valve clearance - Adjust valve clearance
Incorrectly set low idle speed - Correct the settings
Restricted fuel hoses or pipes - Clean fuel system pipes and hoses
Insufficient engine compression: Valves are damaged or leaking - Change the valves
Engine noise or knocking
Fuel injection pump out of timing - Correct injection timing
Fuel injector nozzles are defective or dirty - Install new set of properly balanced nozzles
Insufficient engine oil - Check and refill engine oil
Coolant temperature is low - Warm up the engine
Crankshaft or main bearings wear - Change or repair worn components
Broken or defective piston rings - Replace the piston rings as required
Loose flywheel screws - Inspect the flywheel screws and tighten securely
Engine consuming too much oil
Oil leaking: Gaskets or seals are excessively worn - Change worn parts according to specifications
Wrong oil viscosity - Use oil of proper viscosity
Worn or broken piston rings - Change the piston rings as required
Valve stems or guides are damaged - Valves must be replaced
Damaged cylinder liners or pistons - Inspect pistons and liners, fit new components as necessary

Electrical System Troubleshooting
Battery cannot be charged
Battery is defective - Install a new battery
Bad battery electrical wire harness - Check wires for malfunctions, repair or replace
Corroded or loose terminals and cables - Tighten or service terminals and cables
Belt is worn or belt tension is incorrectly adjusted - Replace belt or adjust belt tension correctly
Starter turns slowly
Battery power is low - Battery needs to be recharged
Battery does not hold charge - Service charging system or install new battery
Damaged battery cable harness - Check electrical cables for damage, repair or replace
Loose or corroded battery cables and terminals - Clean or tighten cables and terminals
Starter will not work
Low battery output - Battery is drained, charge it
Discharged or worn battery - Recharge or change battery
Faulty starter motor - Repair or install a new starter
Improperly connected or disconnected wiring harness - Inspect wiring harness and connect properly

Transmission Troubleshooting
Gears are hard to shift
Clutch is unadjusted or worn - Replace or adjust clutch
Gear shift linkage is stuck or worn - Replace or repair the shift linkage
Bent or worn shift forks - Shift forks need to be changed
Gearshift mechanism is worn out - Repair or replace worn components if required
Transmission fluid pressure is insufficient
Not enough fluid in transmission - Add transmission fluid as required
Transmission oil filter element is dirty (if fitted) - Replace or clean transmission oil filter
Relief valve failure - Replace the valve
Transmission makes noise
Broken or worn bearings - Change the bearings
Low transmission oil level - Checking transmission oil level and add if necessary
Contaminated transmission oil - Transmission oil must be changed
Backlash is incorrect or gears are worn - Set backlash properly or change the gears
Bent or worn shift forks - Change defective shift forks
Transmission oil leaking
Gaskets or seals are defective Seals and gaskets replacement required
Cracked transmission case - Install a new transmission case

Hydrostatic Transmission Troubleshooting
Hydrostatic transmission makes excessive noise
Insufficient transmission fluid level or contaminated fluid - Change the transmission fluid or fill to required level
Damaged or out of adjustment speed control rod linkage - Replace rod linkage or adjust correctly
Faulty relief valve - Install a new relief valve
Transmission overloaded - Reduce transmission load
Worn or damaged parts of the hydrostatic transmission - After disassembling and checking, change defective parts
Transmission oil overheated
Not enough fluid in transmission - Fill system with correct transmission fluid level
Transmission fluid filter is plugged - Change or clean the transmission fluid filter
Clogged or damaged cooling components - Inspect all cooling components and replace or clean if necessary
Transmission is under excessive load - The load should be reduced
Loss of power
Oil level is low - Correct the transmission oil level
Charge pressure is insufficient - Check charge pressure
Worn or damaged relief valve - Replace valve as required
Transmission oil leakage
Gaskets or seals are damaged - Gaskets or seal need to be replaced
Transmission housing internal pressure is excessive - Inspect transmission components for wear or damage and replace if necessary
Clogged oil return tube - Service or replace return tube

Hydraulics Troubleshooting
Hydraulic system overheating
Improper hydraulic pressure adjustments - Adjust it correctly
Unadjusted or defective main relief valve - Adjust or replace the relief valve
Hydraulic fluid is dirty - Hydraulic fluid change required
Air in hydraulic system - Check the pump seals, suction line, and fittings
Hydraulic fluid pressure is low
Not enough hydraulic oil in the system - Fill the hydraulic system with oil
Hydraulic oil filter element clogging - Clean the hydraulic filter element or replace if necessary
Defective hydraulic pump - Flow-rate hydraulic pump and replace pump if necessary
Defective or not adjusted hydraulic control valve - Adjust correctly or change
Broken hydraulic cylinder - Inspect cylinder parts for wear or damage and replace if required
Leakage in hydraulic pipes - Find leaks in the system and fix it
3-point hitch won't raise or raises slowly
Lack of hydraulic fluid - Need to add fluid
Cold fluid in hydraulic system - Wait for fluid to warm up
Hydraulic oil filter element clogging - Clean or change hydraulic filter
Damaged hydraulic oil pump - Check pump flow and change pump if necessary
Misadjusted or defective main relief valve - Set up or change the relief valve
Hydraulic control valve block is defective or set improper - Replace or adjust correctly
Hydraulic cylinder failure - Check cylinder parts for wear or damage and replace if necessary
Damaged or loose suction line - Tighten or change
3-point hitch fails to drop or drops slowly
Hydraulic control valve is not set properly or defective - Change or set correctly
Hydraulic cylinder is broken - Check cylinder parts for wear or damage and replace if necessary
Hitch rock shaft is damaged - Replace the shaft
Mechanical parts of the hitch are damaged - Change damaged or worn hitch components
Jerky lifting or lowering of 3-point hitch
Air trapped in the hydraulic system - Check the suction line, pump seals, and fittings
Hydraulic oil is dirty - Hydraulic oil change required
Hydraulic pump not working - Check pump flow and install new pump if necessary
Faulty or incorrect setting hydraulic control valve - Change or set correctly
Hydraulic cylinder is not working - Check cylinder parts for damage or wear and replace if necessary

Steering System Troubleshooting
Steering wheel turns hard
Defective or incorrectly installed steering column - Reinstall the steering column or change it
Air leaks in steering system - Bleed air from system
Not adjusted toe-in - Check toe-in and correct
Front tires are worn out - Install new tires
Steering pump stopped working - Repair or replace steering pump
Hydrostatic steering unit is defective or worn - Inspect and change as required
Relief valve malfunction or sticking - Inspect relief valve and replace if necessary
Not enough steering fluid - Fill up steering fluid to required level
Steering system oil leak - Retighten steering line and hose connections
Excessive steering wheel play
Steering column shaft or coupling is worn out - Change defective component
Hydrostatic steering unit is worn or defective - Inspect and replace as required
Steering pump malfunction - Check the steering pump and replace if necessary
Steering tie-rod ends or linkage are defective - Replace failed component
Tractor pulls to right or left
Low tire pressure - Inflate the tires
Not adjusted toe-in - Adjust toe-in properly
Worn or faulty steering tie-rod ends or linkage - Change damaged component
Worn or defective hydrostatic steering unit - Change or repair steering unit if required
Faulty steering cylinder - Change or repair hydraulic steering cylinder
Front hub bearings are damaged or incorrectly adjusted - Change or adjust bearings 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