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Kubota B7000 Troubleshooting

The Kubota B7000 is a 2-wheel drive or 4-wheel drive sub-compact utility tractor. This model was manufactured from 1973 to 1977. The tractor was designed in 2 versions: B7000E (2WD) and B7000D (4WD).

The Kubota B7000 tractor is equipped with a 39.07 cu.in (0.6L) Kubota Z650 4-cycle 2-cylinder water-cooled naturally aspirated diesel engine. The engine has a cylinder bore of 2.99" (76 mm), piston stroke of 3.23" (82 mm), rated power of 14 hp (10.4 kW), and 29.2 Nm (21.6 lb-ft) of max torque at 1800 rpm.

The mechanical transmission includes a dry clutch and unsynchronized gearbox with 6 forward and 2 reverse gears. The maximum travel speed (forward/reverse): 8.1 mph (13 km/h) and 4 mph (6.4 km/h). The Kubota B7000 was equipped with a manual steering system, mechanical brakes, 5.00x12 or 20x8.00-10 front tires, and 8.00x16 or 7.00x16 rear tires. The wheelbase is 48.4" (1220 mm).

Engine Troubleshooting
Engine doesn't start or hard to start
Fuel filter is clogged - Service the filter
No fuel injection - Open fuel cock to inject fuel
There is air in the fuel system - Bleed the system
Clogged fuel injectors - Test fuel injectors and change if necessary
Defective fuel injection pump - Install a new pump or rebuild
Bad compression - Inspect cylinder block and replace worn components
Engine stalls while running
Engine is not preheated - Normalize the temperature by warming up the engine
Air in fuel system - Air-bleed fuel system
Irregular fuel injection - Adjust fuel injection timing
Fuel filter plugging - Replace filter element
Dirty or damaged injectors - Clean or replace fuel injectors
Diesel starts and then stalls
Fuel injection pump out of timing - Repair or replace fuel injection pump
Clogged fuel filter element - Clean or replace the filter
Clogged or damaged injector nozzles - Change injector nozzles
Fuel injection pump is not operating properly - Replace injection pump or repair it
Air cleaner is clogged - Replace or clean the air cleaner element
Engine stops at low idle speed
Incorrectly set low idle speed - Adjustment required
Fuel injection pump damage - Install a new fuel pump or repair
Clogged or damaged injector nozzles - Install a new set of well-balanced nozzles
Valve clearance is wrong - Correct valve clearance needs to be set
Engine is overheated
Engine coolant is insufficient - The cooling system needs to be refilled. Check radiator and hoses for leaks
Cooling system parts are failed or system is clogged - Change faulty components or service cooling system
Engine oil level is insufficient - Add oil to the engine crankcase
Fan belt tension is improper or belt is damaged - Adjust belt tension properly or change it
Thermostat is defective - Check and replace if required
Loss of engine power
Fuel injectors are clogged or faulty - Check fuel injectors and replace if required
Fuel injection pressure is wrong - Adjust to proper pressure
Air filter element is dirty - Air filter maintenance required
Oil filter clogging - Clean or replace engine oil filter element
Engine is overloaded - Change to lower gear or reduce load
Valve out of adjustment - Need to adjust valve clearance
Wrong adjustment of low idle speed - Test and adjust
Fuel hoses or pipes clogging - Clean fuel pipes and hoses
Low engine compression: Valves are broken or leaking - Replace the valves as required
Engine knocks or noises
Incorrect setting of fuel injection pump timing - Check and correct settings
Fuel injector nozzles are damaged or dirty - Change or clean injector nozzles
Engine oil insufficient - Add oil to the engine crankcase
Coolant temperature is low - Engine is not warmed up to the required temperature
Crankshaft or main bearings wear - Install new parts
Stuck or worn piston rings - Install new piston rings
Loose flywheel bolts - Inspect flywheel bolts and tighten properly
High engine oil consumption
Oil leaks: Seals or gaskets are defective - Replace defective parts
Oil viscosity is incorrect - Use oil of correct viscosity
Piston rings are seized or worn - Install new piston rings
Damaged valve stems or valve guides - Replace defective valves
Cylinder liners or pistons are scuffed - Inspect liners and pistons, change as necessary

Electrical System Troubleshooting
Battery won’t charge
Battery dead cell - Use a new battery
Battery cable harness failure - Check battery electrical cable for defects, replace or repair
Corroded or loose battery cables and terminals - Terminals and cables need to be tightened or cleaned
Belt is damaged or belt tension is incorrectly adjusted - Adjust belt tension as required or change belt
Starter turning slow
Battery voltage is low - Battery is drained, recharge it
Battery does not hold charge - Battery needs to be serviced or replaced
Bad battery wiring harness - Inspect wiring for malfunctions, replace or repair
Battery terminals and cables are loose or corroded - Clean or tighten terminals and cables
Starter doesn't crank
Low battery voltage - Battery needs to be recharged
Discharged or defective battery - Recharge or replace battery
Starter motor is damaged - Replace or repair starter
Wiring is improperly connected or disconnected - Need to reconnect the wiring properly

Transmission Troubleshooting
Hard shifts
Incorrectly adjusted or damaged clutch - Change or adjust clutch
Gear shift linkage is damaged or loose - Replace or repair the shift linkage
Worn or damaged shift forks - Shift forks need to be replaced
Gearshift mechanism failure - Change or repair failed components
Low transmission fluid pressure
Low transmission fluid level - Check and refill the transmission fluid
Transmission fluid filter element is dirty (if fitted) - Change or service the transmission fluid filter
Relief valve sticking - Replace relief valve as required
Transmission noise
Bearings are worn or damaged - Bearings need to be changed
Insufficient oil supply - Fill up the transmission oil
Dirty transmission fluid - Change transmission fluid
Worn gears or improper backlash - Change damaged gears or adjust backlash properly
Worn or damaged shift forks - Shift forks need to be replaced
Transmission oil leaking
Gaskets or seals are defective Install new components
Cracked transmission housing - Housing needs to be replaced

Hydraulics Troubleshooting
Excessive hydraulic system heat
Incorrect hydraulic pressure adjustments - Adjust correctly
Main relief valve incorrect adjustment or failure - Adjust the valve or replace if necessary
Hydraulic oil is dirty - Hydraulic oil change required
Air enters in hydraulic system - Check the suction pipe, fittings, and pump seals
Hydraulic fluid pressure is insufficient
Hydraulic oil level is low - Fill up the hydraulic oil
Dirty hydraulic oil filter - Clean or replace the hydraulic filter
Hydraulic pump not working - Test the pump flow rate and change pump if required
Faulty or incorrect setting hydraulic control valve - Change or adjust properly
Defective hydraulic cylinder - Check cylinder components for wear or damage and change if necessary
Hydraulic pipes are leaking - Detect leaks in hydraulic system and repair it
Hitch won't lift or lifts slowly
Not enough hydraulic oil in the system - Check oil level and add hydraulic oil as required
Cold fluid in hydraulic system - Wait for fluid to warm up
Hydraulic fluid filter is clogged - Replace filter element or clean if required
Faulty hydraulic oil pump - Check the pump capacity and replace pump if required
Main relief valve is damaged or adjusted improperly - Adjust the valve or replace if necessary
Faulty or incorrect setting hydraulic control valve - Replace or adjust correctly
Defective hydraulic cylinder - Inspect cylinder components for wear or damage and change if required
Damaged or loose hydraulic suction line - Tighten or change it
Hitch won't lower or lowers slowly
Defective or incorrect setting hydraulic spool valve block - Replace or adjust properly
Hydraulic cylinder is defective - Inspect cylinder components for wear or damage and change if required
Worn lift arm shaft - Install a new shaft
Internal mechanical failure of the hitch - Replace worn or defective hitch parts
Hitch is lowered or raised jerkily
Aeration in hydraulic system - Inspect the suction line, pump seals, and fittings
Dirty hydraulic fluid - The fluid must be changed
Hydraulic pump not working - Check pump capacity and change if necessary
Faulty or incorrect setting hydraulic spool valve - Replace or adjust properly
Hydraulic cylinder is not working - Inspect cylinder components for damage or wear and change if required

Steering System Troubleshooting
Hard Steering
Steering knuckle or steering column is stuck - Inspect steering column and knuckle, replace worn parts
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