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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
Engine stops when idling
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
Engine is overheated
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
Engine loses power
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
Starter motor turns slow
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
Transmission makes noise
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
Transmission oil leakage
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



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