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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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
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| Farm Tractors Technical Specifications |
