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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 |
