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Kubota L4310 Troubleshooting
The
Kubota L4310 Grand L10 series compact utility tractor was manufactured between
1998 and 2002. The tractor was designed in 5 versions: L4310F (2WD), L4310DT
(4WD, Sync Shuttle), L4310GST (4WD, Glide-Shift), L4310HST (Hydro), and
L4310HSTC (Cab, hydro).
The Kubota L4310 is powered by 134.1 cu.in (2.2 L) Kubota V2203-A
4-cycle vertical 4-cylinder indirect injection diesel engine with a
rated power of 43 hp (32.1 kW) and 146.2 Nm (107.8 lb-ft) of peak torque
at 1600 rpm. The Kubota L4310 is fitted with 3 transmission options: 8x8
Sync Shuttle fully synchronized transmission (FST), 8x8 (16x16
w/creeper) Glide Shift transmission (GST), or 3-range hydrostatic
transmission (HST). The maximum travel speed (forward/reverse): 14.7 mph
(23.7 km/h) and 13.5 mph (21.8 km/h).
The open center hydraulic system includes a gear pump with rated fluid
flow of 7.8 gpm (29.5 lpm). The 2WD models are equipped with 6.00x16
front tyres and 14.9x24 rear tyres. The 8.3x16 front tyres and 14.9x24
rear tyres fit 4WD tractors. The wheelbase is 71.3" (1810 mm) inch for
models with 2-wheel drive and 71.1" (1805 mm) for models with 4-wheel
drive.
Compatible attachments for the Kubota L4310 tractor: 60", 72"
front-mount blades with hydraulic lift system,
Kubota LA681 loader with
lift capacity to full height of 1500 lbs (680 kg), and Kubota BL4690
backhoe with maximum digging depth of 90.2" (2290 mm) and bucket digging
force of 2950 lbs (1340 kg).
| Engine Troubleshooting |
| Engine won't start or hard to start |
| Fuel filter is dirty - Change the filter element |
| Closed fuel cock - Open fuel on-off cock to inject fuel |
| Fuel lines leaking air - Tighten clamps, change faulty pipes |
| Fuel injectors are defective or dirty - Test fuel injectors and change if necessary |
| Fuel injection pump is not operating properly - Replacement or repair required |
| Engine has bad compression - Inspect cylinder block and change worn parts |
| Engine stops unexpectedly while running |
| Engine is not fully warmed up - Warm up engine as required |
| Water, dirt, or air in fuel system - Drain, flush, fill, and bleed system |
| Uneven fuel injections - Repair or adjustment |
| Dirty fuel filter element - Service or replace the filter |
| Fuel injectors are clogged or faulty - Check fuel injectors and replace if required |
| Engine starts but immediately stops |
| Incorrectly set fuel injection pump timing - Fuel injection pump timing adjustment needs to be corrected |
| Fuel filter clogging - Replace filter element |
| Fuel injector nozzles are damaged - Replace fuel injector nozzles |
| Fuel injection pump is defective - Rebuild or replace pump |
| Clogged air cleaner element - Service or change air cleaner |
| Incorrect low idle speed adjustment - Correct low idle adjustment |
| Faulty fuel injection pump - Rebuild or replace pump |
| Fuel injector nozzles are damaged or dirty - Test injector nozzles and replace as required |
| Improper valve clearance - Check and adjust as required |
| Low coolant level - Refill to the correct level. Any leaks must be repaired |
| Cooling system is clogged or cooling components are defective - Replace faulty parts or flush the cooling system |
| Engine oil insufficient - Checking oil level and add if necessary |
| Fan belt tension is improper or belt is defective - Adjust as required or change belt |
| Defective or wrong type of thermostat - Check and change if necessary |
| Fuel injectors are clogged or faulty - Test fuel injectors and change if necessary |
| Incorrect fuel injection pressure - Check the fuel injection pressure and adjust if necessary |
| Clogged air filter element - Service or replace the air filter |
| Clogged oil filter - Change or clean engine oil filter element |
| Diesel engine overloaded - Reduce the load or use a lower gear |
| The valve clearance is incorrect - Correct valve clearance needs to be set |
| Incorrectly adjusted low idle speed - Adjustment required |
| Dirty fuel pipes or hoses - Service fuel pipes and hoses |
| Engine lost compression: Valves are defective or worn - Have valves replaced |
| Engine knocking sound or abnormal noise |
| Fuel injection pump out of timing - Repair or replace fuel injection pump |
| Fuel injector nozzles are damaged - Replace fuel injector nozzles |
| Engine oil level low - Need to add engine oil |
| Engine has not warmed up to required temperature - Warm up the engine to required temperature |
| Main bearings or crankshaft are worn out - Install new parts |
| Piston rings are defective or broken - Piston rings need to be replaced |
| Flywheel bolts are loose - Bolts need to be tightened |
| Excessive oil consumption |
| Oil leakage: Damaged seals or gaskets - To repair leaks, replace worn parts |
| Wrong oil viscosity - Fill up with the proper oil viscosity |
| Damaged or seized piston rings - Change piston rings |
| Valve guides and stems are worn - Replace defective valves |
| Scuffed pistons or cylinder liners - Check liners and pistons, change as required |
| Electrical System Troubleshooting |
| Battery will not charge |
| Battery dead cell - Replace the battery |
| Battery wiring harness failure - Inspect electrical cables for defects, repair or replace |
| Loose or corroded battery terminals and cables - Clean or tighten terminals and cables |
| Belt is damaged or belt tension is incorrectly adjusted - Adjust belt tension as required or change belt |
| Battery capacity is low - Battery is drained, recharge it |
| Battery drains quickly - Service battery or replace it |
| Battery wiring harness failure - Inspect electrical cables for defects, repair or replace |
| Battery cables and terminals are loose or corroded - Terminals and cables need to be tightened or cleaned |
| Battery capacity is low - Recharge the battery |
| Discharged or faulty battery - Change or recharge battery |
| Defective starter motor - Repair or replace starter |
| Battery cables are disconnected or incorrectly connected - Check cables and reconnect it correctly |
| Transmission Troubleshooting |
| Difficult to shift gears |
| Worn or misadjusted clutch - Adjust or change the clutch |
| Loose or broken gear shift linkage - Change defective shift linkage |
| Bent or worn shift forks - Shift forks need to be changed |
| Faulty gear shifting mechanism - Faulty parts must be changed |
| Transmission fluid pressure is insufficient |
| Lack of transmission fluid supply - Fill up the transmission fluid |
| Transmission oil filter element is clogged (if equipped) - Change or clean the transmission oil filter |
| Faulty relief valve - Replace valve as required |
| Bearings are worn or damaged - Bearings need to be replaced |
| Fluid level is low - Check and refill the transmission fluid |
| Dirty transmission oil - Fill up with fresh transmission oil |
| Incorrect backlash or gears are defective - Replace gears or set backlash properly |
| Worn or damaged shift forks - Install new shift forks |
| Gaskets or seals are broken - Install new components |
| Cracked transmission case - Install a new transmission case |
| Hydrostatic Transmission Troubleshooting |
| Hydrostatic transmission is excessively noisy |
| Dirty transmission oil or insufficient oil level - Change the oil or fill to required level |
| Worn or misadjusted speed control rod linkage - Adjust or replace control rod linkage |
| Faulty relief valve - Change the valve |
| Transmission is under excessive load - Reduce loading |
| Worn or damaged parts of the hydrostatic transmission - After disassembling and checking, change defective parts |
| Transmission fluid overheats |
| Oil level is low - Fill up the transmission oil |
| Clogged transmission fluid filter element - Clean or replace the transmission fluid filter |
| Damaged or clogged cooling components - Check all cooling components and clean or replace if required |
| Excessive transmission load - Reduce loading |
| Oil level is insufficient - Checking transmission oil level and add if necessary |
| Charge pressure is insufficient - Test charge pressure |
| Worn or defective relief valve - Change relief valve |
| Transmission fluid leakage |
| Gaskets or seals are damaged - Install new gaskets or seal |
| Internal transmission case pressure is too high - Change or repair damaged parts |
| Clogged oil return tube - Service or replace return tube |
| Hydraulics Troubleshooting |
| Excessive hydraulic system heat |
| Improper hydraulic system pressure setting - Set the pressure properly |
| Main relief valve is defective or unadjusted - Adjust or replace the relief valve |
| Contaminated hydraulic fluid - Change hydraulic fluid |
| Air trapped in the hydraulic system - Inspect the pump seals, suction pipe, and fittings |
| Low hydraulic oil pressure |
| Hydraulic fluid level is insufficient - Check and refill the hydraulic fluid |
| Hydraulic oil filter clogging - Service or replace the hydraulic filter |
| Hydraulic pump is faulty - Check the pump capacity and replace pump if required |
| Damaged or incorrect adjusted hydraulic control valve - Adjust properly or replace |
| Hydraulic cylinder is not working - Inspect the hydraulic cylinder parts for damage or wear and replace if required |
| Leakage in hydraulic pipes - Inspect hydraulic system for leaks and repair it |
| 3-point hitch lifts slowly or won't lift |
| Not enough hydraulic fluid in the system - Fill the hydraulic system with oil |
| Cold hydraulic fluid - Warm up the fluid |
| Hydraulic oil filter clogging - Clean or replace the hydraulic filter |
| Defective hydraulic pump - Test pump flow rate and replace pump if required |
| Defective or misadjusted main relief valve - Replace or set up the relief valve |
| Hydraulic spool valve is defective or set improper - Change or adjust properly |
| Defective hydraulic cylinder - Check cylinder components for damage or wear and change if necessary |
| Broken or disconnected suction line - Connect or replace |
| 3-point hitch won't drop or drops slowly |
| Hydraulic control valve is defective or set improper - Replace or set properly |
| Hydraulic cylinder malfunction - Inspect cylinder parts for wear or damage and replace if required |
| Damaged hitch cross shaft - Install a new shaft |
| The hitch has internal mechanical malfunctions - Replace damaged or worn hitch parts |
| Hitch lower or lift is jerky |
| Air enters in hydraulic system - Inspect the pump seals, suction pipe, and fittings |
| Contaminated hydraulic oil - Change hydraulic oil |
| Faulty hydraulic oil pump - Flow-rate pump and change pump if necessary |
| Hydraulic control valve is not set properly or defective - Change or adjust correctly |
| Hydraulic cylinder failure - Inspect the hydraulic cylinder parts for damage or wear and replace if required |
| Steering System Troubleshooting |
| Steering is difficult |
| Worn or improperly mounted steering column - Mount the steering column properly or change it |
| Air in steering system - Bleed the system of air |
| Incorrect toe-in adjustment - Adjust toe-in properly |
| Tires are improperly inflated - Inflate as necessary |
| Worn steering pump - Replace or repair steering pump |
| Defective or worn hydrostatic steering unit - Inspect and replace as required |
| Relief valve seizing or malfunction - Check relief valve and change if required |
| Lack of steering oil - Fill the steering system with oil |
| Oil leakage in the steering system - Tighten connections of hydraulic hoses and pipes in steering system |
| Excessive free play of steering wheel |
| Worn steering column coupling or shaft - Replace faulty part |
| Faulty or worn hydrostatic steering unit - Replace or repair steering unit as required |
| Steering pump stopped working - Repair or replace steering pump |
| Steering linkage or tie-rod ends are defective - Change damaged component |
| Tractor is pulling to left or right |
| Tires are not properly inflated - Inflate tires as required |
| Incorrect toe-in - Check toe-in and correct |
| Worn or faulty steering linkage or tie-rod ends - Replace damaged part |
| Faulty or worn hydrostatic steering unit - Change or repair steering unit if required |
| Defective steering cylinder - Replace or repair steering cylinder |
| Front hub bearings are defective or improperly adjusted - Adjust properly or change bearings |
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| Farm Tractors Technical Specifications |
