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Kubota B7510 Troubleshooting

The Kubota B7510 is a B7-10 series compact utility tractor. This model was manufactured from 2004 to 2007. The tractor was designed in 2 versions: B7510DT (gear drive) and B7510HSD (hydrostatic drive).

The Kubota B7510 is powered by 61 cu.in (1 L) Kubota D1005-E 3-cylinder water-cooled diesel engine with a maximum power of 19 hp (14 kW) and 59 Nm (43.5 lb-ft) of peak torque at 2600 rev/min. The Kubota B7510 is fitted with 2 types of transmission. Type 1: Gear shift transmission with 6 forward and 2 reverse gears. Type 2: Two-range hydrostatic transmission with infinite forward and reverse gears.

The maximum forward speed - 12.7 mph (20.4 kph), max. reverse speed - 7.3 mph (11.7 kph). The open center hydraulic system used a dual pump with rated capacity of 4.4 gpm (16.7 lpm). The Kubota B7510 was equipped with a power assist steering system, wet disc brakes, 6.00x12 or 5.00x12 front tires, and 9.50x16 or 8.00x16 rear tires. The wheelbase is 59.1 in (1500 mm).

The tractor is compatible with 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 will not start or hard to start
Dirty fuel filter element - Change the filter element
Closed fuel supply valve - Open supply valve to inject fuel
There is air in the fuel system - Bleed the system
Faulty or dirty injectors - Test fuel injectors and change if necessary
Fuel injection pump is faulty - Replacement or repair required
Bad engine compression - Inspect cylinder block and change defective components
Engine stalls during operation
Engine has not warmed up to the recommended temperature - Warm up the engine
Air in fuel system - Air-bleed fuel system
Irregular fuel injection - Adjust fuel injection timing
Fuel filter is dirty - Clean the filter or install new filter element
Fuel injectors are clogged or faulty - Change fuel injectors
Engine starts but immediately shuts off
Fuel injection pump timing is incorrect - Fuel pump timing settings need to be corrected
Fuel filter is dirty - Replace the filter element
Damaged or clogged injector nozzles - Check and change nozzles as required
Defective fuel injection pump - Repair or install new pump
Clogged air cleaner element - Replace or clean the air cleaner element
Engine stalls when idle
Incorrectly set low idle speed - Correct low idle adjustment
Fuel injection pump damage - Change or repair the pump
Faulty fuel injector nozzles - Inspect injector nozzles and change if required
Valve clearance is wrong - Adjust valve clearance
Engine overheating
Insufficient coolant fluid - Add the coolant. Check the components of cooling system
Cooling system parts are defective or system is clogged - Flush cooling system or change faulty components
Engine oil insufficient - Add oil to the engine crankcase
Fan belt is damaged or belt tension is incorrect - Adjust as required or replace belt
Defective thermostat - Thermostat needs to be replaced
Engine lacks power
Dirty or faulty injectors - Check fuel injectors and replace if required
Incorrect fuel injection pressure - Repair or replace injection pump
Air filter element clogging - Change or replace air filter element
Plugged engine oil filter - Clean or replace engine oil filter element
Engine is running overloaded - Reduce the load or use a lower gear
The valve clearance is incorrect - Adjust valve clearance
Low idle speed set incorrectly - Adjust the low idle speed
Restricted fuel hoses or pipes - Fuel pipes and hoses need to be cleaned
Engine low compression: Intake or exhaust valves are damaged - Valve replacement required
Engine noises or knocks
Timing of fuel injection pump is not adjusted - Check and correct adjustments
Fuel injector nozzles are clogged or faulty - Service or replace nozzles if required
Engine oil insufficient - Need to add engine oil
Engine is not fully warmed up - Warm up the engine
Worn main bearings or crankshaft - Change defective components as required
Piston rings failure - Have piston rings replaced
Loose flywheel bolts - Check flywheel bolts and tighten properly
Diesel engine consuming too much oil
Oil leakage: Gaskets or seals are excessively worn - Change worn parts according to specifications
Incorrect oil viscosity - Use proper viscosity oil
Worn or stuck piston rings - Piston rings replacement required
Valve stems and guides are worn - Replace defective valves
Damaged pistons or cylinder liners - Inspect liners and pistons, replace as necessary

Electrical System Troubleshooting
Battery does not charge
Battery faulty cell - Battery replacement required
Bad battery wiring harness - Inspect wiring for malfunctions, replace or repair
Corroded or loose battery cables and terminals - Clean or tighten cables and terminals
Incorrect belt tension adjustment or worn belt - Change belt or correctly adjust belt tension
Starter cranks slowly
Low battery voltage - Recharge the battery
Battery is not holding charge - Service charging system or install new battery
Bad battery cable harness - Inspect cables for malfunctions, repair or change
Corroded or loose terminals and cables - Clean or tighten terminals and cables
Starter will not crank
Low battery output - Charge the battery
Discharged or faulty battery - Change or recharge battery
Defective starter motor - Starter needs to be replaced
Wiring is improperly connected or disconnected - Need to reconnect the wiring properly

Transmission Troubleshooting
Hard shifts
Failure or improper clutch adjustment - Clutch needs to be replaced or adjusted
Stuck or damaged gear shift linkage - Replace or repair the shift linkage
Damaged or worn shift forks - Shift forks need to be replaced
Defective gearshift mechanism - Replace defective components
Insufficient transmission oil pressure
Not enough oil in transmission - Fill up the transmission oil
Transmission fluid filter is dirty (if equipped) - Clean or replace the transmission fluid filter
Faulty relief valve - Replace valve as required
Transmission noises
Cracked or worn bearings - Faulty bearings should be changed
Oil level is low - Fill the transmission housing to proper oil level
Contaminated transmission oil - Fill up with fresh transmission oil
Gears are worn or backlash is improper - Change worn gears or set backlash correctly
Bent or worn shift forks - Change defective shift forks
External oil leaks
Gaskets or seals are damaged - Install new components
Cracked transmission housing - Housing needs to be replaced

Hydrostatic Transmission Troubleshooting
Excessive HST transmission noise
Low fluid level or contaminated fluid - Change the transmission fluid or fill to required level
Damaged or out of adjustment speed control rod linkage - Repair or adjust link rod linkage
Damaged relief valve - Replace the valve
Excessive loading - Load needs to be reduced
Transmission components are worn or damaged - After disassembling and checking, change defective parts
Transmission fluid overheated
Insufficient fluid supply - Fill up the transmission fluid
Clogged transmission fluid filter element - Change or service the transmission fluid filter
Cooling components are defective or plugged - Check all cooling components and clean or replace if required
Transmission overload - Load needs to be reduced
Power is too low
Oil level is low - Correct the transmission oil level
Charge pressure is too low - Test charge pressure
Relief valve is damaged or worn - Change relief valve
Transmission oil leaking
Worn gaskets or seals - Gaskets or seal need to be replaced
High pressure inside the transmission case - Repair or replace worn parts
Oil return pipe is clogged - Check pipe and clean if necessary

Hydraulics Troubleshooting
Hydraulic system overheated
Incorrect pressure in hydraulic system - Changing the system pressure
Main relief valve malfunction or incorrect adjustment - Adjust or change relief valve
Contaminated hydraulic fluid - Change hydraulic fluid
Air leaks in hydraulic system - Check the suction pipe, fittings, and pump seals
Hydraulic oil pressure is insufficient
Hydraulic fluid level is low - Check and refill the hydraulic fluid
Hydraulic oil filter is dirty - Hydraulic filter maintenance required
Defective hydraulic pump - Check pump flow and install new pump if necessary
Defective or not adjusted hydraulic control valve - Adjust correctly or replace
Hydraulic cylinder is broken - Inspect cylinder parts for wear or damage and replace if required
Hydraulic lines are leaking - Find leaks in the system and fix it
3-point hitch does not raise or raises very slowly
Hydraulic oil level is insufficient - Fill up the hydraulic oil
Cold oil in hydraulic system - Wait for oil to warm up
Dirty hydraulic oil filter - Hydraulic filter maintenance required
Hydraulic pump malfunction - Check pump performance and change it if necessary
Unadjusted or defective main relief valve - Adjust the valve or replace if necessary
Hydraulic spool valve block is faulty or out of adjustment - Change or set correctly
Hydraulic cylinder malfunction - Check the hydraulic cylinder parts for damage or wear and replace if necessary
Damaged or loose suction line - Tighten or change
Hitch can't drop or drops too slowly
Hydraulic control valve block is defective or set improper - Set correctly or replace
Broken hydraulic cylinder - Check the hydraulic cylinder parts for damage or wear and replace if necessary
Hitch cross shaft is worn - Install a new shaft
Internal mechanical malfunction with hitch - Change faulty or worn hitch components
Hitch is lowered or raised jerkily
Air leaks in hydraulic system - Check the pump seals, suction line, and fittings
Hydraulic oil is contaminated - Fill up with fresh hydraulic oil
Hydraulic pump is faulty - Test pump performance and replace pump if necessary
Defective or not adjusted hydraulic control valve - Change or set correctly
Faulty hydraulic cylinder - Check cylinder components for wear or damage and change if necessary

Steering System Troubleshooting
Steering is hard
Worn or improperly mounted steering column - Mount the steering column properly or change it
Air leaks in steering system - Air-bleed steering system
Improper toe-in adjustment - Check and adjust toe-in
Incorrect tire pressure - Inflate the tires correctly
Faulty steering pump - Steering pump needs to be repaired or replaced
Damaged or worn power steering valve - Inspect and change as required
Damaged steering box components - Replace defective parts of power steering box
Steering fluid level low - Checking steering fluid level and add it if necessary
Oil leaks in the steering system - Tighten connections of hydraulic hoses and pipes in steering system
Excessive steering wheel free play
Steering column shaft or coupling is worn out - Replace faulty part
Defective or worn power steering valve - Repair or change the steering valve
Faulty steering box components - Defective power steering box components must be replaced
Hydraulic steering pump is defective - Install a new hydraulic steering pump
Steering linkage or tie-rod ends are defective - Change damaged part
Tractor is pulling to left or right
Deflated front tyres - Inflate tyres as needed
Improper toe-in adjustment - Adjust toe-in properly
Steering linkage or tie-rod ends are worn - Replace failed component
Faulty steering box components - Repair power steering box
Defective or worn power steering valve - Replace or repair steering valve as required
Front hub bearings are improperly adjusted or defective - Change or adjust bearings correctly



Farm Tractors Technical Specifications
JD 1026R JD 3650 JD 6400 JD 7810
FORD 1320 FORD 2810 FORD 3930 FORD 5600
MF 250 MF 690 MF 3060 MF 6180
NH TC48DA NH M100 NH T7550 NH 8560
CASE IH 495 CASE IH 1255XL CASE IH 2140 CASE IH 2294