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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
Engine overheating
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
Engine power is reduced
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
Starter cranks slow
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
Starter will not crank
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
External oil leaks
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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