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Kubota M7500 Troubleshooting
The
Kubota M7500 is a 2WD or 4WD utility tractor. This model was manufactured
between 1979 and 1986. The Kubota M7500 tractor is equipped with Kubota V4000
4-stroke 4-cylinder liquid-cooled diesel engine.
A 243 cubic inches (4 L) engine has a cylinder bore of 4.13" (105 mm),
piston stroke of 4.53" (115 mm), and rated power of 81 hp (60.5 kW). The
gear transmission includes a dry clutch and gearbox with 16 forward and
4 reverse gears. The maximum forward speed - 17 mph (27.3 kph), max.
reverse speed - 8 mph (12.8 kph).
The open center hydraulic system includes a gear pump with rated fluid
flow of 9.3 gal/min (35 l/min). The 4-wheel drive models (M7500DT) are
equipped with 11.2x24 front tyres and 18.4x28 rear tyres. The 7.50x16
front tyres and 18.4x28 rear tyres fit 2-wheel drive tractors. The wheel
base is 84.8 inches (2150 mm) for 2WD models and 85.6 inches (2170 mm)
for 4WD models.
Engine Troubleshooting |
Engine won't start or starts hard |
Fuel filter is dirty - Change filter element |
Fuel is not supplied from the tank to the system - Check the fuel shut-off valve |
Air trapped in fuel system - Bleed air |
Fuel injectors are damaged or dirty - Check fuel injectors and replace if required |
Fuel injection pump damage - Install a new pump or rebuild |
Low compression - Check cylinder block and replace worn parts |
Engine stops running unexpectedly |
Engine is cold - Warm up the engine as required |
Air in fuel system - Air-bleed fuel system |
Irregular fuel injection - Adjust fuel injection timing |
Clogged fuel filter element - Change filter element |
Faulty or dirty injectors - Service or change fuel injectors |
Diesel starts and stalls suddenly |
Timing of fuel injection pump is not adjusted - Fuel injection pump timing adjustment needs to be corrected |
Fuel filter clogging - Filter maintenance required |
Fuel injector nozzles are clogged or faulty - Install new set of properly balanced nozzles |
Defective fuel injection pump - Replace injection pump or repair it |
Dirty air cleaner - Replace or service air cleaner element |
Engine stalls while idling |
Too low idle RPM - Adjust low idling as recommended |
Fuel injection pump is not working correctly - Change or repair the pump |
Fuel injector nozzles are defective or dirty - Replace fuel injector nozzles |
Excessive valve clearance - Check and adjust |
Not enough coolant - Coolant needs to be refilled. Check for coolant leaks |
Cooling system components are failed or system is clogged - Replace faulty parts or service cooling system |
Not enough engine oil - Check oil level and add oil as required |
Broken fan belt or incorrect belt tension - Adjust belt tension properly or change it |
Thermostat failure - Check thermostat, replace if necessary |
Clogged or damaged injectors - Test fuel injectors and change if necessary |
Incorrect fuel injection pressure - Adjust to correct pressure |
Air filter is dirty - Service or change air filter |
Oil filter is dirty - Clean or replace engine oil filter element |
Engine overloaded - Shift to lower gear or reduce the load |
Valve clearance is out of adjustment - Need to adjust valve clearance |
Incorrect low idle setting - Test and adjust |
Dirt in the fuel pipes or hoses - Clean fuel hoses and pipes |
Insufficient engine compression: Valves are faulty or leaking - Change the valves |
Engine knocking sound or abnormal noise |
Fuel injection pump out of timing - Repair or replace fuel injection pump |
Fuel injector nozzles are clogged or faulty - Install a new set of well-balanced nozzles |
Engine oil level is low - Check oil level and add oil as required |
Engine not warmed up - Warm up engine as required |
Crankshaft or main bearings failure - Repair or replace defective parts |
Piston rings are defective or broken - Have piston rings replaced |
Loose flywheel bolts - Inspect flywheel bolts and tighten properly |
Diesel engine consuming too much oil |
Oil leakage: Gaskets or seals may be damaged - Replace defective parts |
Oil viscosity is incorrect - Fill up with the correct oil viscosity |
Piston rings are seized or worn - Install new piston rings |
Valve guides or stems are damaged - Need to replace the valves |
Worn cylinder liners or pistons - Check liners and pistons, change as required |
Electrical System Troubleshooting |
Battery is not charging |
Battery faulty cell - Use a new battery |
Bad battery cable harness - Inspect cables for malfunctions, repair or change |
Battery terminals and cables are corroded or loose - Terminals and cables need to be tightened or cleaned |
Belt slipping or wrong belt tension adjustment - Install new belt or adjust belt tension as required |
Low battery output - Recharge the battery |
Battery discharges quickly - Battery needs service or replacement |
Battery cable harness failure - Check battery electrical cable for defects, replace or repair |
Battery terminals and cables are corroded or loose - Tighten or clean cables and terminals |
Low battery capacity - Low battery charging, charge as required |
Discharged or defective battery - Replace or charge as required |
Starter motor is faulty - Replace or repair starter |
Disconnected or incorrectly connected cables - Inspect battery cables and connect correctly |
Transmission Troubleshooting |
Gear shift is hard |
Misadjusted or defective clutch - Adjust or install new clutch |
Stuck or damaged gear shift linkage - Service or replace shift linkage |
Damaged or worn shift forks - Change defective shift forks |
Gearshift mechanism is worn out - Repair or replace worn components if required |
Transmission oil pressure is low |
Oil level is low - Add transmission oil as required |
Plugged transmission fluid filter (if equipped) - Replace or clean transmission fluid filter |
Relief valve failure - Install a new relief valve |
Transmission is excessively noisy |
Cracked or worn bearings - Faulty bearings should be replaced |
Low transmission oil level - Correct the transmission oil level |
Dirty transmission oil - Fill up with fresh transmission oil |
Worn gears or improper backlash - Replace gears or set backlash properly |
Damaged or worn shift forks - Replace defective shift forks |
Broken gaskets or seals - Install new gaskets or seal |
Transmission case is cracked - Replace case or transmission assembly |
Hydraulics Troubleshooting |
Hydraulic system overheating |
Hydraulic system pressure is incorrect - Hydraulic pressure needs to be set correctly |
Main relief valve is defective or unadjusted - Adjust or replace the relief valve |
Contaminated hydraulic fluid - Change hydraulic fluid |
Air in hydraulic system - Inspect the suction line, pump seals, and fittings |
Hydraulic fluid pressure too low |
Lack of hydraulic oil - Check oil level and add hydraulic oil as required |
Hydraulic oil filter element clogging - Service the hydraulic filter or change if required |
Hydraulic pump failure - Check pump capacity and change if necessary |
Hydraulic control valve block is defective or set improper - Adjust properly or replace |
Broken hydraulic cylinder - Check the hydraulic cylinder parts for damage or wear and replace if necessary |
Hydraulic piping leaks - Detect leaks in hydraulic system and repair it |
3-point hitch does not raise or raises very slowly |
Lack of hydraulic fluid - Need to add fluid |
Hydraulic oil is too cold - Allow oil to warm |
Hydraulic fluid filter clogging - Clean the hydraulic filter or install new filter element |
Hydraulic pump is faulty - Check pump flow and change pump if necessary |
Misadjusted or defective main relief valve - Adjust or replace the relief valve |
Defective or not adjusted hydraulic control valve - Adjust correctly or replace |
Hydraulic cylinder is not working - Inspect cylinder parts for wear or damage and replace if required |
Disconnected or damaged suction pipe - Connect or replace |
Hitch drops too slowly or can't drop |
Damaged or incorrect adjusted hydraulic spool valve - Set correctly or replace |
Defective hydraulic cylinder - Inspect cylinder parts for wear or damage and replace if required |
Lift arm shaft is worn - Replace the shaft |
The hitch has any internal mechanical damage - Change defective or worn hitch components |
3-point hitch lift or lower is jerky |
Air enters in hydraulic system - Check the suction pipe, fittings, and pump seals |
Dirty hydraulic oil - The oil must be changed |
Damaged hydraulic oil pump - Check the pump performance and replace it if required |
Hydraulic spool valve is defective or set improper - Set correctly or replace |
Hydraulic cylinder is not working - Inspect the hydraulic cylinder parts for damage or wear and replace if required |
Steering System Troubleshooting |
Steering wheel turns hard |
Steering column is defective or improperly assembled - Change steering column or assemble properly |
Air trapped in the steering system - Bleed air |
Improper toe-in adjustment - Check and adjust toe-in |
Front tires are worn out - Install new tires |
Worn steering pump - Check the steering pump and replace if necessary |
Worn or defective power steering valve - Inspect and replace as required |
Steering cylinder is defective - Replace or repair hydraulic steering cylinder |
Insufficient steering fluid - Fill up the steering fluid |
Steering system oil leakage - Retighten steering hose and line connections |
Steering wheel has too much free-play |
Worn steering column shaft or coupling - Replace defective part |
Power steering valve is worn or defective - Inspect and replace as required |
Steering pump is faulty - Steering pump needs to be repaired or replaced |
Steering tie-rod ends or linkage are defective - Replace damaged part |
Front wheels wander to left or right |
Tires are improperly inflated - Inflate as necessary |
Toe-in adjustment is incorrect - Adjust toe-in correctly |
Worn or faulty steering tie-rod ends or linkage - Change failed part |
Power steering valve is worn or defective - Inspect and change as required |
Steering cylinder is defective - Replace or repair hydraulic steering cylinder |
Defective or improperly adjusted front hub bearings - Replace or adjust the bearings correctly |
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Farm Tractors Technical Specifications |