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Kubota B6100 Troubleshooting
The
Kubota B6100 sub compact tractor was manufactured from 1978 to 1997. This model
was designed in 4 versions: B6100E (2WD Gear), B6100D (4WD Gear), B6100HST-E
(2WD Hydrostatic), and B6100HST-D (4WD Hydrostatic). The Kubota B6100 tractor is
powered by 41.2 cubic inches (675 cc) Kubota D650-A 4-cycle vertical
three-cylinder liquid-cooled diesel engine.
The engine has a cylinder bore of 2.52" (64 mm), piston stroke of 2.76"
(70 mm), rated power of 14.3 hp (10.6 kW), and 36.5 Nm (27.1 lb-ft) of
max torque at 1800 rpm. The Kubota B6100 is fitted with two transmission
options: mechanical transmission with 6 forward and 2 reverse gears, or
2-range hydrostatic transmission with infinite forward and reverse
gears. The maximum travel speed (forward and reverse): 9.1 mph (14.5
km/h) / 6.2 mph (10.1 km/h).
The Kubota B6100 is equipped with a manual steering system, mechanical
shoe (Gear) or internal expanding (HST) brakes, 4.00x9 (2WD) or 6.00x12
(4WD) front tires, and 7.00x16 (2WD) or 8.00x16 (4WD) rear tires. The
gear models have a wheelbase of 48.9" (1240 mm) with 2WD or 49.1" (1245
mm) with 4WD. The HST models have a wheelbase of 54.7" (1380 mm) with
2WD or 55.1" (1390 mm) with 4WD.
| Engine Troubleshooting |
| Engine won't start or hard to start |
| Fuel filter is dirty - Replace filter element |
| Closed fuel cock - Open fuel on-off cock to inject fuel |
| Fuel lines leaking air - Tighten clamps, change faulty pipes |
| Fuel injectors are clogged or faulty - Test fuel injectors and change if necessary |
| Fuel injection pump failure - Repair or change injection pump |
| Bad engine compression - Check and change damaged parts |
| Diesel shuts off during operation |
| Engine has not warmed up to the recommended temperature - Warm up the engine |
| Water, dirt, or air in fuel system - Drain, flush, fill, and bleed system |
| Irregular fuel injection - Adjust fuel injection timing |
| Plugged fuel filter - Change the filter element |
| Clogged or damaged injectors - Clean or replace fuel injectors |
| Engine stops after starting |
| Incorrectly set fuel injection pump timing - Check and correct adjustments |
| Fuel filter is dirty - Replace the filter element |
| Fuel injector nozzles are dirty or defective - Change or clean injector nozzles |
| Faulty fuel injection pump - Repair or install a new fuel pump |
| Dirty air cleaner element - Install new cleaner element or replace it |
| Low idle speed setting is incorrect - Correct low idle settings |
| Fuel injection pump is broken - Install a new fuel pump or repair |
| Fuel injector nozzles fault - Service or replace injector nozzles |
| Incorrect valve clearance - Adjust valve clearance |
| Lack of coolant in cooling system - Add the coolant. Inspect the system for leaks |
| Cooling system components are failed or system is clogged - Flush cooling system or change faulty components |
| Lack of engine oil - Fill the crankcase with engine oil |
| Damaged fan belt or incorrect belt tension - Adjust belt tension properly or change it |
| Thermostat fault - Check and change if necessary |
| Diesel engine is losing power |
| Fuel injectors are defective or dirty - Change fuel injectors |
| Incorrect fuel injection pressure - Adjust pressure to proper level |
| Dirty air filter element - Replace or clean the air filter element |
| Dirty oil filter element - Service or change engine oil filter element |
| Engine is overloaded - Load reducing is recommended |
| Valve clearance is not correct - Adjust valve clearance according to specifications |
| Low idle speed adjustment is incorrect - Normalize low idle speed |
| Dirty fuel pipes or hoses - Service fuel pipes and hoses |
| Insufficient engine compression: Valves are broken or leaking - Valves need to be replaced |
| Timing of fuel injection pump is wrong - Fuel pump timing settings need to be corrected |
| Fuel injector nozzles are defective or dirty - Install new set of properly balanced nozzles |
| Engine oil level is insufficient - Fill up the engine oil |
| Low coolant temperature - Warm up engine as required |
| Main bearings or crankshaft are worn out - Replace crankshaft or bearings |
| Stuck or worn piston rings - Replace the piston rings as required |
| Flywheel mounting screws are loose - Tighten the screws |
| Excessive engine oil consumption |
| Oil leaking: Defective seals or gaskets - Change to repair leaks |
| Incorrect oil viscosity - Use oil of correct viscosity |
| Worn or stuck piston rings - Change the piston rings as required |
| Worn valve stems and valve guides - Replace defective valves |
| Pistons or cylinder liners are scored - Inspect pistons and liners, fit new components as necessary |
| Electrical System Troubleshooting |
| Battery cannot be charged |
| Battery is worn - Change the battery |
| Damaged battery wiring harness - Inspect wiring for damage, replace or repair |
| Battery terminals and cables are corroded or loose - Tighten or clean terminals and cables |
| Damaged belt or incorrectly adjusted belt tension - Change belt or adjust belt tension properly |
| Low battery power - Charge the battery |
| Battery is draining quickly - Service charging system or replace battery |
| Bad battery cable harness - Inspect cables for malfunctions, repair or change |
| Loose or corroded cables and terminals - Service or tighten battery cables and terminals |
| Starter motor is not working |
| Low battery output - Low battery charging, charge as required |
| Discharged or worn battery - Charge or change the battery |
| Defective starter motor - Repair or install a new starter |
| Incorrectly connected or disconnected wires - Check battery wires and connect correctly |
| Transmission Troubleshooting |
| Hard shifts |
| Incorrectly adjusted or damaged clutch - Clutch needs to be replaced or adjusted |
| Damaged or loose gear shift linkage - Service or replace shift linkage |
| Shift forks are worn or damaged - Change the shift forks |
| Faulty parts in the gear shifting mechanism - Change faulty parts |
| Lack of transmission oil pressure |
| Fluid level is low - Check transmission fluid level and add it as required |
| Dirty transmission oil filter (if fitted) - Change or service the transmission oil filter |
| Faulty relief valve - Replace relief valve |
| Transmission makes excessive noise |
| Cracked or worn bearings - Bearings replacement required |
| Not enough fluid in transmission - Add transmission fluid as required |
| Dirty transmission oil - Transmission oil must be changed |
| Defective gears or incorrect backlash - Set backlash properly or change the gears |
| Shift forks are worn or damaged - Replace defective shift forks |
| Broken gaskets or seals - Install new components |
| Cracked transmission housing - Housing needs to be replaced |
| Hydrostatic Transmission Troubleshooting |
| HST transmission is excessively noisy |
| Dirty transmission oil or insufficient oil level - Change the oil or fill to required level |
| Speed control rod linkage is damaged or unadjusted - Repair or adjust link rod linkage |
| Relief valve is defective - Replace the valve |
| Transmission overload - The load should be reduced |
| Transmission components are worn or damaged - After disassembly and checking, replace worn components |
| Transmission oil overheated |
| Not enough oil in transmission - Check transmission oil level and add oil as required |
| Clogged transmission fluid filter element - Change or clean the transmission fluid filter |
| Cooling components are plugged or defective - Check all cooling components and change or repair if required |
| Excessive transmission load - Reduce transmission load |
| Not enough oil in transmission - Checking transmission oil level and add if necessary |
| Low charge pressure - Test charge pressure |
| Relief valve is worn or defective - Replace relief valve as required |
| Gaskets or seals are damaged - Replace worn seal or gaskets |
| Internal transmission case pressure is too high - Replace defective components |
| Clogged transmission fluid drain line - Service or replace drain line |
| Hydraulics Troubleshooting |
| Hydraulic system overheating |
| Hydraulic system pressure is not adjusted correctly - Correct adjustment is required |
| Faulty or incorrectly adjusted main relief valve - Adjust or replace the relief valve |
| Hydraulic oil contamination - Change the oil |
| Air trapped in the hydraulic system - Check the pump seals, suction line, and fittings |
| Hydraulic fluid pressure is insufficient |
| Lack of hydraulic fluid - Need to add fluid |
| Hydraulic fluid filter element clogging - Replace filter element or clean if required |
| Damaged hydraulic oil pump - Flow-rate hydraulic pump and replace pump if necessary |
| Defective or incorrect setting hydraulic control valve block - Adjust properly or replace |
| Broken hydraulic cylinder - Inspect the hydraulic cylinder components for damage or wear and change if required |
| Hydraulic pipes are leaking - Inspect hydraulic system for leaks and repair it |
| Three-point hitch lifting is too slow or cannot be lifted |
| Lack of hydraulic fluid - Add fluid to the hydraulic system |
| Hydraulic oil is too cold - Allow oil to warm |
| Hydraulic oil filter is dirty - Service or replace the hydraulic filter |
| Hydraulic pump not working - Check hydraulic pump flow and replace pump if necessary |
| Main relief valve malfunction or incorrect adjustment - Adjust relief valve or change if required |
| Hydraulic control valve is defective or set improper - Replace or adjust correctly |
| Broken hydraulic cylinder - Inspect cylinder parts for wear or damage and replace if required |
| Damaged or disconnected suction pipe - Connect or replace |
| Hitch does not lower or lowers very slowly |
| Hydraulic spool valve block is faulty or out of adjustment - Replace or adjust correctly |
| Defective hydraulic cylinder - Check cylinder components for wear or damage and change if necessary |
| Damaged lift arm shaft - Replace the shaft |
| The hitch is defective if there is internal mechanical damage - Change worn or damaged hitch components |
| Hitch raises or lowers not smoothly |
| Air trapped in the hydraulic system - Check the pump seals, suction pipe, and fittings |
| Contaminated hydraulic fluid - Change hydraulic fluid |
| Hydraulic pump failure - Flow-rate hydraulic pump and replace pump if necessary |
| Hydraulic spool valve block is defective or set improper - Change or adjust correctly |
| Faulty hydraulic cylinder - Inspect cylinder parts for wear or damage and replace 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 |
