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