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Kubota B7001 Troubleshooting
The
Kubota B7001 is a 2-wheel drive or 4-wheel drive sub-compact utility tractor.
This model was manufactured between 1976 and 1979. The tractor was designed in 2
versions: B7001E (2WD) and B7001DT (4WD).
The Kubota B7001 tractor is equipped with a 46.5 cu.in (800 cc) Kubota
D750 4-cycle vertical 3-cylinder indirect injection naturally aspirated
water-cooled diesel engine with a maximum power of 16 hp (11.9 kW) and
42.2 Nm (31.3 lb-ft) of peak torque at 1800 rpm. The mechanical
transmission includes a dry clutch and unsynchronized gearbox with 6
forward and 2 reverse gears.
The maximum forward speed - 8.1 mph (13 kph), max. reverse speed - 4 mph
(6.4 kph). The Kubota B7001 is equipped with a manual steering system,
mechanical disc brakes, 5.00x12 or 20x8.00-10 front tires, and 7.00x16
or 8.00x16 rear tires. The wheel base is 49.6" (1240 mm).
| Engine Troubleshooting |
| Engine doesn't start or difficult to start |
| Fuel filter plugging - Clean the filter element |
| Closed fuel supply valve - Open supply valve to inject fuel |
| Air trapped in fuel system - Bleed air |
| Fuel injectors are clogged or faulty - Inspect fuel injectors and replace if necessary |
| Fuel injection pump is damaged - Rebuild or change fuel pump |
| Engine has bad compression - Check cylinder block and replace damaged components |
| Engine shuts off while driving |
| Engine is cold - Normalize the temperature by warming up the engine |
| Fuel lines leaking air - Tighten clamps, change faulty pipes |
| Irregular fuel injection - Adjust fuel injection timing |
| Fuel filter plugging - Filter maintenance required |
| Fuel injectors are defective or dirty - Check fuel injectors and replace if required |
| Diesel starts but then stalls |
| Unadjusted fuel injection pump timing - Check the fuel injection pump timing setting |
| Fuel filter is clogged - Install new filter element |
| Dirty or defective injector nozzles - Replace fuel injector nozzles |
| Faulty fuel injection pump - Repair or change injection pump |
| Air cleaner element is dirty - Install new cleaner element or replace it |
| Engine shuts off while idling |
| Low idle speed setting is not correct - Test and adjust |
| Defective fuel injection pump - Rebuild or install a new injection pump |
| Dirty or defective injector nozzles - Service or replace injector nozzles |
| Valve clearance is not correct - Check and adjust as required |
| Not enough coolant - Fill the cooling system. If there are leaks in the system, replace worn components |
| Cooling system components are failed or system is dirty - Flush cooling system or change faulty components |
| Insufficient engine oil - Check and refill engine oil |
| Fan belt is defective or belt tension is not adjusted - Adjust belt tension correctly or replace it |
| Thermostat fault - Check thermostat, replace if necessary |
| Dirty or damaged injectors - Change fuel injectors |
| Uneven fuel injection pressure - Adjust to proper pressure |
| Air filter element is clogged - Service or replace the air filter |
| Engine oil filter is plugged - Service or change engine oil filter element |
| Engine overloaded - Reduce load or shift to lower gear |
| Excessive valve clearance - Adjust valve clearance according to specifications |
| Low idle speed setting is incorrect - Adjustment required |
| Restricted fuel pipes or hoses - Clean fuel system hoses and pipes |
| Loss of compression: Intake or exhaust valves are damaged - Change the valves |
| Abnormal engine knocking or noise |
| Fuel injection pump out of timing - Adjust the fuel injection pump timing correctly |
| Fuel injector nozzles are dirty or defective - Service or replace injector nozzles |
| Lack of engine oil - Fill up the engine oil |
| Low coolant temperature - Engine is not warmed up to the required temperature |
| Crankshaft or main bearings are worn out - Replace crankshaft or bearings |
| Defective or broken piston rings - Replace piston rings |
| The flywheel to crankshaft bolts are loose - Tighten bolts as required |
| Engine using too much oil |
| Oil leakage: Gaskets or seals may be damaged - Change worn parts according to specifications |
| Improper oil viscosity - Use proper viscosity oil |
| Stuck or worn piston rings - Change piston rings |
| Valve stems or guides are damaged - Install new valves |
| Worn pistons or cylinder liners - Check liners and pistons, install new components as required |
| Electrical System Troubleshooting |
| Battery is not charging |
| Battery faulty cell - Install a new battery |
| Bad battery wiring harness - Inspect wiring for malfunctions, replace or repair |
| Loose or corroded terminals and cables - Tighten or clean terminals and cables |
| Damaged belt or incorrectly adjusted belt tension - Change belt or adjust belt tension properly |
| Low battery output - Battery needs to be recharged |
| Battery won’t hold charge - Service charging system or change battery |
| Battery cable harness damage - Check battery cables for damage, change or repair |
| Loose or corroded terminals and cables - Clean or tighten cables and terminals |
| Battery capacity is low - Battery is drained, recharge it |
| Discharged or faulty battery - Change or recharge battery |
| Damaged starter motor - Starter should be replaced |
| Improperly connected or disconnected wiring harness - Inspect wiring harness and connect properly |
| Transmission Troubleshooting |
| Hard to shift gears |
| Incorrectly adjusted or damaged clutch - Adjust clutch or change if necessary |
| Loose or broken gear shift linkage - Change defective shift linkage |
| Damaged or worn shift forks - Change defective shift forks |
| Defective gearshift mechanism - Replace defective components |
| Low transmission oil pressure |
| Not enough oil in transmission - Correct the transmission oil level |
| Dirty transmission oil filter (if fitted) - Change or clean the transmission oil filter |
| Relief valve is defective - Replace the valve |
| Transmission makes excessive noise |
| Damaged or worn bearings - Change faulty bearings |
| Not enough fluid in transmission - Fill system with correct transmission fluid level |
| Dirty transmission oil - Fill up with fresh transmission oil |
| Improper backlash or damaged gears - Change worn gears or set backlash correctly |
| Shift forks are damaged or worn - Replace the shift forks |
| Gaskets or seals are broken - Gaskets or seal need to be replaced |
| Transmission case is cracked - Replace case or transmission assembly |
| Hydraulics Troubleshooting |
| Hydraulic system is too hot |
| Hydraulic system pressure is not corrected - The pressure must be adjusted correctly |
| Main relief valve is defective or unadjusted - Adjust or replace the relief valve |
| Hydraulic oil is contaminated - Fill up with fresh hydraulic oil |
| Air leaks in hydraulic system - Inspect the pump seals, suction pipe, and fittings |
| Hydraulic fluid pressure is low |
| Hydraulic fluid level is insufficient - Need to add fluid |
| Hydraulic fluid filter is dirty - Replace hydraulic filter element or service if necessary |
| Hydraulic pump is defective - Flow-rate pump and change pump if necessary |
| Hydraulic control valve block is defective or set improper - Change or set correctly |
| Hydraulic cylinder is faulty - Inspect the hydraulic cylinder parts for damage or wear and replace if required |
| Hydraulic pipes are leaking - Identify leaks in the system and repair it |
| 3-point hitch won't raise or raises slowly |
| Hydraulic fluid level is insufficient - Check and refill the hydraulic fluid |
| Cold hydraulic fluid - Warm up the fluid |
| Hydraulic fluid filter clogging - Clean or change hydraulic filter |
| Hydraulic pump malfunction - Test the pump flow rate and change pump if required |
| Misadjusted or defective main relief valve - Adjust relief valve or change if required |
| Hydraulic control valve block is defective or set improper - Replace or set properly |
| Hydraulic cylinder failure - Check cylinder parts for wear or damage and replace if necessary |
| Broken or disconnected suction line - Connect or replace |
| 3-point hitch won't drop or drops slowly |
| Hydraulic control valve block is faulty or out of adjustment - Adjust correctly or replace |
| Broken hydraulic cylinder - Check cylinder parts for wear or damage and replace if necessary |
| Hitch cross shaft is damaged - Change the shaft |
| The hitch has any internal mechanical damage - Replace worn or faulty hitch components |
| 3-point hitch lifting or lowering is jerky |
| Air leaks in hydraulic system - Check the pump seals, suction line, and fittings |
| Dirty hydraulic oil - The oil must be changed |
| Damaged hydraulic oil pump - Check pump performance and change it if necessary |
| Defective or not adjusted hydraulic spool valve - Adjust properly or replace |
| Defective hydraulic cylinder - Check cylinder components for damage or wear and change if necessary |
| 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 |
