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Kubota B6000 Troubleshooting
The
Kubota B6000 sub compact utility tractor was manufactured between 1973 and 1977.
This model was designed in two versions: B6000E (2WD) and B6000D (4WD). The
Kubota B6000 tractor is equipped with a 35.2 cu.in (577 cc) Kubota ZL600
vertical two-cylinder naturally aspirated water-cooled diesel engine with a
rated power of 12.5 hp (9.3 kW) and 32.9 Nm (24.4 lb-ft) of maximum torque at
2000 rpm.
The manual shift transmission consists of a dry single plate clutch and
unsynchronized gearbox with 6 forward and 2 reverse gears. Max. travel
speed (forward and reverse): 7.7 mph (12.5 kph) / 4.2 mph (6.7 kph). The
open center hydraulic system includes a gear pump with a rated capacity
of 2.8 gpm (10.8 lpm).
The main relief pressure is 83 bar (1200 psi). The 2WD models are
equipped with 4.00x9 front tires and 7.00x16 rear tires. The 6.00x12 or
20x8.00-10 front tires and 7.00x16 or 27x8.50-15 rear tires are used for
4WD tractors. The wheel base is 47.2" (1200 mm) for models with 2-wheel
drive and 45.5" (1160 mm) for models with 4-wheel drive.
| Engine Troubleshooting |
| Engine won't start or starts hard |
| Fuel filter clogging - Change filter element |
| Closed fuel cock - Open fuel on-off cock to inject fuel |
| Air in fuel lines - Bleed fuel lines |
| Fuel injectors are clogged or faulty - Check fuel injectors and replace if required |
| Fuel injection pump is broken - Replace injection pump or repair it |
| Low compression - Inspect cylinder block and change defective components |
| Engine stops running while driving |
| Engine not warmed up - Warm up to required temperature |
| Air in fuel system - Air-bleed fuel system |
| Improper fuel injection - Fuel injection settings required |
| Fuel filter clogging - Replace the filter element |
| Dirty or damaged injectors - Clean or replace fuel injectors |
| Diesel starts but then stalls |
| Timing of fuel injection pump is wrong - Adjust the fuel injection pump timing correctly |
| Clogged fuel filter element - Filter maintenance required |
| Clogged or damaged injector nozzles - Change injector nozzles |
| Fuel injection pump malfunctioning - Replace or repair injection pump |
| Air cleaner clogging - Change or replace air cleaner element |
| Improperly adjusted low idle speed - Adjust low idling as recommended |
| Fuel injection pump malfunctioning - Replacement or repair required |
| Fuel injector nozzles are damaged - Install a new set of well-balanced nozzles |
| Valve clearance is out of adjustment - Adjust to proper valve clearance |
| Low coolant level - Add the coolant. If there are leaks in the system, replace worn components |
| Cooling system is dirty or cooling parts are failed - Replace faulty parts or service cooling system |
| Insufficient engine oil - Fill up the engine oil |
| Fan belt is defective or belt tension is not adjusted - Adjust belt tension correctly or change it |
| Thermostat fault - Thermostat needs to be replaced |
| Fuel injectors are clogged or faulty - Change fuel injectors |
| Incorrect fuel injection pressure - Adjust to correct pressure |
| Dirty air filter element - Air filter maintenance required |
| Oil filter element clogged - Clean or change engine oil filter |
| Engine is running overloaded - Reduce load or shift to lower gear |
| Improper valve clearance - Correct valve clearance needs to be set |
| Improperly adjusted low idle speed - Correct the settings |
| Fuel pipes or hoses are dirty - Clean fuel system hoses and pipes |
| Engine compression is low: Intake or exhaust valves are damaged - Replace the valves as required |
| Abnormal engine knocking or noise |
| Timing of fuel injection pump is not adjusted - Check the fuel injection pump timing setting |
| Fuel injector nozzles fault - Service or replace injector nozzles |
| Not enough engine oil - Need to add engine oil |
| Coolant temperature is low - Warm up the engine |
| Worn main bearings or crankshaft - Have bearings or crankshaft replaced |
| Defective or broken piston rings - Install new piston rings |
| The flywheel to crankshaft bolts are loose - Tighten bolts as required |
| Engine using too much oil |
| Oil leakage: Defective seals or gaskets - Change worn parts according to specifications |
| Oil viscosity is wrong - Use correct viscosity oil |
| Piston rings are stuck or broken - Piston rings replacement required |
| Valve stems and guides are worn - Replace defective valves |
| Cylinder liners or pistons are scored - Inspect pistons and liners, replace as required |
| Electrical System Troubleshooting |
| Battery cannot be charged |
| Battery bad cell - Install a new battery |
| Bad battery wiring harness - Inspect wiring for malfunctions, replace or repair |
| Loose or corroded terminals and cables - Cables and terminals must be tightened or cleaned |
| Damaged belt or incorrectly adjusted belt tension - Adjust belt tension correctly or replace belt |
| Battery voltage is low - Charge the battery |
| Battery runs out quickly - Service charging system or install new battery |
| Battery cable harness failure - Check battery electrical cable for defects, replace or repair |
| Battery terminals and cables are corroded or loose - Clean or tighten cables and terminals |
| Starter motor is not working |
| Low battery output - Battery is drained, recharge it |
| Discharged or defective battery - Recharge or replace battery |
| Starter motor is damaged - Repair or change starter |
| Cables harness is improperly connected or disconnected - Inspect cables harness and reconnect it properly |
| Transmission Troubleshooting |
| Difficulty shifting gears |
| Clutch is unadjusted or worn - Adjust clutch or replace if required |
| Gear shift linkage is stuck or damaged - Change or repair shift linkage |
| Damaged or worn shift forks - Shift forks need to be replaced |
| Gear shifting mechanism is worn - Change worn components |
| Transmission fluid pressure is insufficient |
| Insufficient oil supply - Add transmission oil as required |
| Transmission oil filter element is dirty (if fitted) - Replace or service transmission oil filter |
| Damaged relief valve - Change relief valve |
| Damaged or worn bearings - Faulty bearings should be replaced |
| Not enough fluid in transmission - Fill up the transmission fluid |
| Dirty transmission fluid - Change transmission fluid |
| Gears are defective or backlash is incorrect - Set backlash correctly or change the gears |
| Worn or damaged shift forks - Install new shift forks |
| Worn gaskets or seals - Change defective gaskets or seal |
| Transmission housing is cracked - Replace housing or transmission assembly |
| Hydraulics Troubleshooting |
| Excessive hydraulic system heat |
| Hydraulic system pressure is incorrect - Hydraulic pressure needs to be set correctly |
| Main relief valve is damaged or adjusted improperly - Adjust the valve or replace if necessary |
| Contaminated hydraulic oil - Change hydraulic oil |
| Air in hydraulic system - Inspect the suction line, pump seals, and fittings |
| Hydraulic oil pressure is insufficient |
| Lack of hydraulic fluid - Fill the hydraulic system with oil |
| Hydraulic fluid filter is dirty - Hydraulic filter maintenance required |
| Hydraulic pump failure - Check the pump capacity and replace pump if required |
| Faulty or incorrect setting hydraulic control valve - Replace or adjust properly |
| Defective hydraulic cylinder - Check cylinder parts for wear or damage and replace if necessary |
| Leakage in hydraulic lines - Detect leaks in the system and fix it |
| 3-point hitch does not raise or raises very slowly |
| Lack of hydraulic oil - Check oil level and add hydraulic oil as required |
| Hydraulic fluid is too cold - Allow fluid to warm |
| Hydraulic fluid filter element is dirty - Replace filter element or clean if required |
| Hydraulic pump failure - Test the pump flow rate and install new pump if required |
| Defective or misadjusted main relief valve - Adjust or change relief valve |
| Defective or not adjusted hydraulic spool valve - Change or adjust correctly |
| Faulty hydraulic cylinder - Inspect the hydraulic cylinder parts for damage or wear and replace if required |
| Disconnected or damaged suction pipe - Connect or replace |
| Hitch does not lower or lowers very slowly |
| Damaged or incorrect adjusted hydraulic spool valve - Adjust correctly or replace |
| Hydraulic cylinder is not working - Check cylinder components for wear or damage and change if necessary |
| Hitch rock shaft is worn Change the shaft |
| Defective mechanical parts of the hitch - Replace worn or faulty hitch parts |
| Hitch jerks when drop or lift |
| Hydraulic system sucks air - Check the pump seals, suction pipe, and fittings |
| Contaminated hydraulic fluid - Change hydraulic fluid |
| Hydraulic pump is defective - Test pump flow rate and replace pump if required |
| Hydraulic control valve block is faulty or out of adjustment - Adjust properly or replace |
| Hydraulic cylinder is broken - Inspect the hydraulic cylinder parts for damage or wear and replace if required |
| Steering System Troubleshooting |
| Hard Steering |
| Steering knuckle or steering column is stuck - Inspect steering column and knuckle, replace worn parts as required |
| Steering gearbox components are worn - Replace defective components of steering gearbox |
| Faulty drag link or tie rod - Replace or repair |
| Insufficient lubrication in steering box - Need to lubricate the gearbox |
| Not adjusted toe-in alignment - Check and adjust toe-in |
| Tires are not correctly inflated - Inflate tires as necessary |
| Excessive steering wheel free play |
| Steering column bearing or shaft is worn - Change faulty parts |
| Steering linkage assembly is worn or loose - Repair or replace steering linkage |
| Worn steering gearbox bearings - Replace the bearings |
| Front wheel hub bearings or steering knuckles are worn - Change hub bearings or knuckles |
| Damaged or worn steering tie-rod ends - Change faulty part |
| Tractor pulls to right or left |
| Worn or loose steering linkage assembly - Repair or replace steering linkage |
| Defective steering knuckle bushing - Replace knuckle bushing |
| Uneven tire pressure - Inflate the tires properly |
| Toe-in adjustment is incorrect - Adjust toe-in correctly |
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| Farm Tractors Technical Specifications |
