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Kubota B5100 Troubleshooting
The
Kubota B5100 is a two-wheel drive or four-wheel drive sub-compact utility
tractor. This model was manufactured between 1978 and 1984. The tractor was
designed in 2 versions: B5100E (2WD) and B5100DT (4WD).
The Kubota B5100 is equipped with a 31 cu.in (0.5L) Kubota Z500-1A
4-cycle 2-cylinder liquid-cooled naturally aspirated diesel engine. The
engine has a cylinder bore of 2.63" (67 mm), piston stroke of 2.76" (70
mm), maximum power of 12 hp (8.9 kW), and 28.1 Nm (20.7 lb-ft) of max
torque at 1800 rpm.
The mechanical transmission consists of a dry clutch and unsynchronized
gearbox with six forward and two reverse gears. The maximum forward
speed - 8 mph (12.8 km/h), maximum reverse speed - 4 mph (6.4 km/h). The
Kubota B5100 was equipped with a ball screw type manual steering,
differential mechanical shoe brakes, 4.00x9 (2WD) or 4.50x10 (4WD) front
tires, and 7.00x16 rear tires. The wheelbase is 46.6 in (1180 mm).
| Engine Troubleshooting |
| Engine is not starting or hard starting |
| Fuel filter is clogged - Clean or change the filter |
| Closed fuel supply valve - Open supply valve to inject fuel |
| There is air in the fuel system - Bleed the system |
| Fuel injectors are clogged or faulty - Inspect fuel injectors and replace if necessary |
| Damaged fuel injection pump - Change pump or rebuild it |
| Bad compression - Inspect and replace faulty parts |
| Diesel stalls while running |
| Low coolant temperature - Warm up engine as required |
| Fuel-line is leaking air - Retighten clamps, replace defective pipes |
| Fuel injection failed - Use correct settings |
| Fuel filter is dirty - Replace the filter element |
| Dirty or faulty injectors - Clean or replace fuel injectors |
| Incorrectly set fuel injection pump timing - Check the fuel injection pump timing setting |
| Fuel filter is dirty - Filter maintenance required |
| Fuel injector nozzles are damaged or dirty - Service or replace injector nozzles |
| Fuel injection pump is not operating properly - Repair or install new pump |
| Air cleaner is clogged - Service or replace the air cleaner |
| Incorrect low idle speed adjustment - Adjust the low idle speed |
| Fuel injection pump is defective - Replace or rebuild injection pump |
| Fuel injector nozzles are dirty or defective - Install new set of properly balanced nozzles |
| Valve clearance is out of adjustment - Check and adjust as required |
| Not enough coolant - Fill radiator to proper level. If there are leaks in the system, replace worn components |
| Cooling system components are worn or system is clogged - Replace faulty parts or service cooling system |
| Insufficient engine oil - Add oil to the engine crankcase |
| Worn fan belt or unadjusted belt tension - Adjust correctly or change the belt |
| Thermostat malfunction - Check and change if necessary |
| Fuel injectors are clogged or faulty - Check fuel injectors and replace if required |
| Incorrect fuel injection pressure - Correct the pressure settings |
| Air filter element clogging - Service or replace the air filter |
| Engine oil filter is plugged - Clean or change engine oil filter |
| Diesel engine is overloaded - Change to lower gear or reduce load |
| Valve clearance is wrong - Correct valve clearance |
| Too low idle RPM - Adjustment required |
| Fuel hoses or pipes are clogged - Service fuel pipes and hoses |
| Engine losing compression: Valves are defective or worn - Install new valves |
| Incorrectly set fuel injection pump timing - Repair or replace fuel injection pump |
| Fuel injector nozzles are defective or dirty - Install a new set of well-balanced nozzles |
| Not enough engine oil - Check oil level and add oil as required |
| Engine not warmed up - Warm up engine as required |
| Worn main bearings or crankshaft - Replace crankshaft or bearings |
| Piston rings are damaged or broken - Install new piston rings |
| Loose flywheel bolts - Check flywheel bolts and tighten properly |
| Engine oil consumption is too high |
| External oil leaks: Damaged seals or gaskets - Replace to repair leaks |
| Improper oil viscosity - Fill up with the correct oil viscosity |
| Damaged or seized piston rings - Replace piston rings |
| Valve guides or stems are damaged - Change the valves |
| Cylinder liners or pistons are damaged - Check liners and pistons, replace as required |
| Electrical System Troubleshooting |
| Battery does not charge |
| Battery dead cell - Install a new battery |
| Battery electrical wire harness damage - Check battery wires for damage, replace or change |
| Corroded or loose terminals and cables - Cables and terminals must be tightened or cleaned |
| Belt is damaged or belt tension is incorrectly adjusted - Change belt or correctly adjust belt tension |
| Low battery voltage - Battery needs to be recharged |
| Battery won’t hold charge - Battery needs to be serviced or replaced |
| Bad battery cable harness - Inspect cables for malfunctions, repair or change |
| Corroded or loose battery terminals and cables - Service or tighten battery terminals and cables |
| Battery power is low - Battery is drained, recharge it |
| Drained or worn battery - Charge or replace the battery |
| Defective starter motor - Starter needs to be changed |
| Battery cables are disconnected or incorrectly connected - Check cables and reconnect it correctly |
| Transmission Troubleshooting |
| Difficulty shifting gears |
| Misadjusted or defective clutch - Adjust or replace the clutch |
| Gear shift linkage is loose or broken - Change or repair shift linkage |
| Damaged or worn shift forks - Shift forks need to be replaced |
| Gearshift mechanism is worn out - Repair or replace worn components if required |
| Lack of transmission oil pressure |
| Oil level is insufficient - Checking transmission oil level and add if necessary |
| Transmission fluid filter clogging (if fitted) - Clean or replace the transmission fluid filter |
| Faulty relief valve - Replace relief valve |
| Damaged or worn bearings - Faulty bearings should be changed |
| Low transmission oil level - Check transmission oil level and add oil as required |
| Dirty transmission oil - Transmission oil must be changed |
| Gears are worn or backlash is improper - Change worn gears or set backlash correctly |
| Bent or worn shift forks - Install new shift forks |
| Transmission fluid leakage |
| Worn gaskets or seals - Install new components |
| Transmission case is cracked - Replace case or transmission assembly |
| Hydraulics Troubleshooting |
| Excessive hydraulic system heat |
| Hydraulic system pressure is not set correctly - Set the hydraulic pressure as required |
| Main relief valve malfunction or incorrect adjustment - Replace or set up the relief valve |
| Contaminated hydraulic fluid - Change hydraulic fluid |
| Aeration in hydraulic system - Check the pump seals, suction pipe, and fittings |
| Hydraulic fluid pressure too low |
| Hydraulic oil level is low - Fill up the hydraulic oil |
| Hydraulic fluid filter is dirty - Clean the hydraulic filter element or replace if necessary |
| Faulty hydraulic oil pump - Check pump performance and change it if necessary |
| Defective or incorrect setting hydraulic control valve block - Adjust correctly or replace |
| Hydraulic cylinder malfunction - Inspect cylinder parts for wear or damage and replace if required |
| Hydraulic lines are leaking - Find leaks in hydraulic system and repair it |
| 3-point hitch lifts too slowly or can't lift |
| Hydraulic oil level is low - Add oil to the hydraulic system |
| Cold fluid in hydraulic system - Wait for fluid to warm up |
| Hydraulic fluid filter clogging - Clean the hydraulic filter or install new filter element |
| Hydraulic pump is faulty - Test pump flow rate and replace pump if required |
| Defective or misadjusted main relief valve - Adjust or replace the relief valve |
| Hydraulic spool valve is defective or set improper - Replace or set correctly |
| Hydraulic cylinder is faulty - Inspect cylinder parts for wear or damage and replace if required |
| Suction pipe is damaged or loose - Repair or change |
| 3-point hitch lowers slowly or won't lower |
| Hydraulic spool valve block is faulty or out of adjustment - Adjust correctly or replace |
| Defective hydraulic cylinder - Inspect the hydraulic cylinder parts for damage or wear and replace if required |
| Hitch cross shaft is worn - Install a new shaft |
| The hitch has mechanical faults - Change faulty or worn hitch components |
| 3-point hitch lifting or lowering is jerky |
| Aeration in hydraulic system - Check the suction pipe, fittings, and pump seals |
| Hydraulic oil is contaminated - Fill up with fresh hydraulic oil |
| Hydraulic pump failure - Check pump flow and change pump if necessary |
| Hydraulic control valve block is faulty or out of adjustment - Set properly or replace |
| Hydraulic cylinder failure - Check cylinder parts for wear or damage and replace 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 |
