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Kubota B7500 Troubleshooting
The
Kubota B7500 is a four-wheel drive compact utility tractor. This model was
manufactured from 2000 to 2003. The tractor was designed in two versions: B7500D
(gear drive) and B7500HSD (hydrostatic drive).
The Kubota B7500 is powered by Kubota D1005-E three-cylinder liquid
cooled diesel engine. A 61.1 cubic inches (1 L) engine has a cylinder
bore of 3" (76 mm), piston stroke of 2.9" (73.6 mm), and rated power of
19 hp (14.1 kW).
The Kubota B7500 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): 12.7 mph (20.4 km/h) / 7.3 mph (11.7 km/h).
The open center hydraulic system includes a dual gear pump with fluid
flow rate of 7 gal/min (26.5 l/min). The tractor is equipped with
6.00x12 front tyres and 9.50x16 rear tyres. The wheelbase is 59" (1490
mm).
The Kubota B7500 is compatible with the following attachments: 54", 60"
mid-mount 3-blade side discharge rotary mower decks with cutting height
of 1.5-4.0 in (30-100 mm) and hydraulic lift system, and
Kubota LA302
loader with lift capacity to max height of 770 lbs (350 kg).
| Engine Troubleshooting |
| Engine hard starting or not starting |
| Fuel filter plugging - Replace filter element |
| Closed fuel supply valve - Open supply valve to inject fuel |
| Fuel-line is leaking air - Retighten clamps, replace defective pipes |
| Fuel injectors are clogged or faulty - Check fuel injectors and replace if required |
| Fuel injection pump is damaged - Rebuild or replace pump |
| Bad compression - Inspect cylinder block and change worn parts |
| Engine shuts off unexpectedly while running |
| Engine is cold - Warm up engine as required |
| Fuel-line is leaking air - Retighten clamps, replace defective pipes |
| Bad fuel injection - Check and adjust |
| Plugged fuel filter - Change filter element |
| Faulty or dirty injectors - Test fuel injectors and change if necessary |
| Diesel starts but then shuts off |
| Unadjusted fuel injection pump timing - Check the fuel injection pump timing setting |
| Fuel filter is clogged - Install new filter element |
| Faulty fuel injector nozzles - Inspect injector nozzles and change if required |
| Faulty fuel injection pump - Install a new pump or rebuild |
| Clogged air cleaner - Clean or replace the air cleaner element |
| Wrong adjustment of low idle speed - Adjust as required |
| Fuel injection pump malfunction - Replace injection pump or repair it |
| Fuel injector nozzles are damaged or dirty - Service or replace nozzles if required |
| Improper valve clearance - Check and adjust |
| Coolant level is low - Coolant needs to be refilled. Repair any leaks if necessary |
| Cooling system components are worn or system is clogged - Replace faulty parts or service cooling system |
| Engine oil level is insufficient - Fill up the engine oil |
| Incorrect fan belt tension or broken belt - Change or adjust belt tension correctly |
| Defective thermostat - Install new thermostat |
| Diesel engine is losing power |
| Faulty or dirty injectors - Test fuel injectors and change if necessary |
| Uneven fuel injection pressure - Adjust to correct pressure |
| Clogged air filter - Install new filter element or replace it |
| Oil filter is dirty - Service or replace engine oil filter |
| Engine is overloaded - Reduce the load or operate the tractor in lower gears |
| Valve clearance is wrong - Correct valve clearance needs to be set |
| Incorrectly adjusted low idle speed - Adjust as required |
| Fuel hoses or pipes clogging - Clean fuel system pipes and hoses |
| Engine lost compression: Inlet or outlet valves are defective - Have valves replaced |
| Fuel injection pump out of timing - Correct injection timing |
| Clogged or defective injector nozzles - Install a new set of well-balanced nozzles |
| Low engine oil level - Fill the crankcase with engine oil |
| Engine has not warmed up to the recommended temperature - Warm up the engine as required |
| Worn main bearings or crankshaft - Install new parts |
| Defective or broken piston rings - Replace piston rings |
| Flywheel mounting screws are loose - Tighten the screws |
| Excessive engine oil consumption |
| Oil leaks: Seals or gaskets are defective - Defective components must be replaced |
| Oil viscosity is incorrect - Use correct viscosity oil |
| Piston rings are stuck or worn - Piston rings need to be replaced |
| Worn valve stems and valve guides - Replace the valves |
| Pistons or cylinder liners are damaged - Inspect pistons and liners, change as required |
| Electrical System Troubleshooting |
| Battery is not charging |
| Worn-out battery - Battery change required |
| Bad battery cable harness - Inspect cables for malfunctions, repair or change |
| Loose or corroded terminals and cables - Tighten or clean cables and terminals |
| Defective belt or improperly adjusted belt tension - Replace belt or properly adjust belt tension |
| Low battery voltage - Battery is drained, recharge it |
| Battery discharges quickly - Service charging system or replace battery |
| Battery wiring harness damage - Inspect battery wiring for damage, replace or repair |
| Battery terminals and cables are loose or corroded - Terminals and cables need to be tightened or cleaned |
| Starter motor is not working |
| Low battery output voltage - Battery needs to be recharged |
| Drained or defective battery - Replace or charge as required |
| Starter motor is faulty - Replace or repair starter |
| Disconnected or incorrectly connected cables - Need to reconnect cables correctly |
| Transmission Troubleshooting |
| Gear hard to shift |
| Clutch is unadjusted or worn - Change or adjust clutch |
| Gear shift linkage is stuck or damaged - Repair or change shift linkage |
| Shift forks are worn or damaged - Shift forks need to be changed |
| Gearshift mechanism is worn out - Repair or replace worn components if required |
| Insufficient transmission fluid pressure |
| Low transmission fluid level - Fill the transmission housing with fluid |
| Transmission oil filter element is dirty (if fitted) - Change or service the transmission oil filter |
| Relief valve is defective - Replace relief valve as required |
| Transmission is excessively noisy |
| Damaged or worn bearings - Bearings need to be replaced |
| Not enough oil in transmission - Checking transmission oil level and add if necessary |
| Dirty transmission fluid - Transmission fluid must be changed |
| Backlash is incorrect or gears are worn - Replace gears or adjust backlash properly |
| Shift forks are worn or damaged - Install new shift forks |
| Transmission fluid leakage |
| Worn gaskets or seals - Seals and gaskets need to be replaced |
| Cracked transmission housing - Housing needs to be replaced |
| Hydrostatic Transmission Troubleshooting |
| Hydrostatic transmission noises |
| Transmission fluid level is insufficient or fluid is contaminated - Change transmission fluid or fill to required level |
| Defective or out of adjustment speed control rod linkage - Adjust or repair rod linkage |
| Relief valve failure - Replace the valve |
| Transmission is under excessive load - Reduce transmission load |
| Transmission parts are worm or defective - Change or repair damaged parts |
| Transmission oil overheating |
| Lack of transmission fluid supply - Fill system with correct transmission fluid level |
| Transmission fluid filter is plugged - Change or service the transmission fluid filter |
| Cooling components are damaged or clogged - Check all cooling components and repair or change if required |
| Excessive transmission load - Reduce the load is required |
| Not enough oil in transmission - Check transmission oil level and add oil as required |
| Charge pressure is too low - Test charge pressure |
| Relief valve is worn or damaged - Change relief valve |
| Transmission fluid leaking |
| Gaskets or seals are broken - Replace worn gaskets or seal |
| Internal transmission case pressure is too high - Replace defective components |
| Plugged transmission fluid drain pipe - Service or change drain pipe |
| Hydraulics Troubleshooting |
| Hydraulic system is overheated |
| Improper pressure in hydraulic system - Adjust properly |
| Main relief valve is damaged or adjusted improperly - Adjust or replace the relief valve |
| Hydraulic fluid is contaminated - Fill up with new hydraulic fluid |
| Hydraulic system sucks air - Inspect the pump seals, suction pipe, and fittings |
| Insufficient hydraulic oil pressure |
| Hydraulic oil level is insufficient - Fill the hydraulic system with oil |
| Hydraulic oil filter element clogging - Clean or change hydraulic filter |
| Defective hydraulic pump - Check the pump performance and replace it if required |
| Hydraulic spool valve block is faulty or out of adjustment - Adjust correctly or change |
| Defective hydraulic cylinder - Check the hydraulic cylinder parts for damage or wear and replace if necessary |
| Hydraulic piping leaks - Detect leaks in the system and fix it |
| Hitch won't lift or lifts slowly |
| Hydraulic oil level is insufficient - Fill the hydraulic system with oil |
| Cold fluid in hydraulic system - Wait for fluid to warm up |
| Hydraulic fluid filter clogging - Clean or replace the hydraulic filter |
| Damaged hydraulic oil pump - Check the pump performance and replace it if required |
| Main relief valve malfunction or incorrect adjustment - Adjust or change relief valve |
| Defective or not adjusted hydraulic control valve - Set properly or replace |
| Hydraulic cylinder is broken - Check cylinder components for damage or wear and change if necessary |
| Damaged or disconnected suction pipe - Connect or replace |
| Hitch won't lower or lowers slowly |
| Hydraulic control valve block is not set properly or defective - Set properly or replace |
| Defective hydraulic cylinder - Check cylinder parts for wear or damage and replace if necessary |
| Worn lift arm shaft - Change the shaft |
| Mechanical parts of the hitch are damaged - Replace worn or faulty hitch components |
| Hitch is lowered or raised jerkily |
| Hydraulic system sucks air - Inspect the pump seals, suction line, and fittings |
| Hydraulic fluid is contaminated - Fill up with new hydraulic fluid |
| Hydraulic pump not working - Check the pump capacity and replace pump if required |
| Defective or not adjusted hydraulic spool valve - Replace or adjust correctly |
| Hydraulic cylinder malfunction - Inspect the hydraulic cylinder parts for damage or wear and replace if required |
| Steering System Troubleshooting |
| Steering wheel turns hard |
| Steering column is broken or improperly installed - Steering column must be installed properly or replaced |
| Air trapped in the steering system - Bleed air |
| Improper toe-in - Adjust toe-in wheels properly |
| Tires are incorrectly inflated - Inflate as required |
| Steering pump is faulty - Replace or repair steering pump |
| Worn or defective power steering valve - Replace or repair steering valve as required |
| Faulty steering box components - Change defective steering box parts |
| Steering fluid insufficient - Check and refill steering fluid |
| Steering system has oil leaks - Retighten steering line and hose connections |
| Steering wheel free play is excessive |
| Steering column coupling or shaft is worn - Replace defective part |
| Power steering valve is defective or worn - Inspect and replace as required |
| Faulty steering box parts - Change defective steering box parts |
| Steering pump stopped working - Repair or replace steering pump |
| Faulty or worn steering linkage or tie-rod ends - Replace failed component |
| Tractor pulls to right or left |
| Front tires are worn out - Install new tires |
| Incorrect toe-in - Check and adjust toe-in |
| Worn or faulty steering tie-rod ends or linkage - Replace damaged part |
| Faulty steering box components - Replace defective parts of power steering box |
| Power steering valve is damaged or worn - Repair or change the steering valve |
| Front hub bearings are damaged or incorrectly adjusted - Install new bearings or adjust it correctly |
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| Farm Tractors Technical Specifications |
