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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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
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| Farm Tractors Technical Specifications |
