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Home / Farm Tractors / Kubota Tractors / Kubota M8580

Kubota M8580 Troubleshooting

The Kubota M8580 utility tractor from M80 Series was manufactured from 1991 to 1999. The Kubota M8580 powertrain system components: a 284.7 cu.in (4.7 L) Kubota V4702-A 4-cylinder direct injection water-cooled diesel engine and power shuttle transmission with 12 forward and 12 reverse gears. The engine has a cylinder bore of 4.29" (109 mm), piston stroke of 4.92" (125 mm), and rated power of 85 hp (63 kW). The maximum travel speed (forward/reverse): 22.5 mph (36 kph) and 22.2 mph (35.5 kph).

The open center hydraulic system has a gear pump with a rated capacity of 21.1 gal/min (79.9 l/min). The Kubota M8580 is equipped with a hydrostatic power steering, hydraulic wet disc brakes, 12.4x24 or 13.6x24 front tyres, and 16.9x34 or 18.4x34 rear tyres. The tractor can be equipped with the following attachments: Kubota M1410 front-end loader with a lift capacity to full height of 3100 lbs (1406 kg), or Kubota M1275 front-end loader with a lift capacity to full height of 2800 lbs (1270 kg).

Engine Troubleshooting
Engine will not start or difficult to start
Plugged fuel filter - Replace filter element
Fuel shut-off valve closed - Open the fuel shut-off valve
Water, dirt, or air in fuel system - Drain, flush, fill, and bleed system
Clogged or damaged injectors - Check fuel injectors and replace if required
Faulty fuel injection pump - Change or repair the pump
Bad engine compression - Inspect and replace faulty parts
Engine stalls during operation
Engine is cold - Warm up engine to required temperature
Air in fuel lines - Bleed fuel lines
Improper fuel injection - Fuel injection settings required
Fuel filter is clogged - Service or replace the filter
Faulty or dirty injectors - Inspect fuel injectors and replace if necessary
Engine starts but then shuts off
Unadjusted fuel injection pump timing - Adjust injection timing
Fuel filter clogging - Clean the filter element
Clogged or damaged injector nozzles - Replace fuel injector nozzles
Faulty fuel injection pump - Repair or install a new fuel pump
Air cleaner is dirty - Clean or replace the air cleaner element
Engine stalling at idle
Incorrectly adjusted low idle speed - Test and adjust
Fuel injection pump damage - Replace injection pump or repair it
Fuel injector nozzles are dirty or defective - Replace fuel injector nozzles
Valve out of adjustment - Adjust valve clearance
Engine overheated
Engine coolant is insufficient - Add the coolant. Check system for leaks
Cooling system is clogged or cooling components are defective - Replace faulty parts or service cooling system
Insufficient engine oil - Fill up the engine oil
Fan belt is damaged or belt tension is incorrect - Adjust correctly or replace the belt
Defective thermostat - Install new thermostat
Engine lacks power
Faulty or dirty injectors - Change fuel injectors
Fuel injection pressure is incorrect - Correct the pressure settings
Air filter is clogged - Install new filter element or replace it
Engine oil filter is plugged - Service or change engine oil filter element
Engine overloaded - Reduce load or shift to lower gear
Incorrect valve clearance - Need to adjust valve clearance
Wrong adjustment of low idle speed - Normalize low idle speed
Dirt in the hoses or pipes - Clean fuel hoses and pipes
Poor engine compression: Leaking or faulty valves - Valves need to be replaced
Engine knocking or noise
Incorrect setting of fuel injection pump timing - Repair or replace fuel injection pump
Fuel injector nozzles are dirty - Service or replace nozzles if required
Lack of engine oil - Need to add engine oil
Engine is cold - Warm up the engine
Main bearings or crankshaft wear - Crankshaft or bearings need to be replaced
Defective or broken piston rings - Piston rings replacement required
Loose flywheel bolts - Check flywheel bolts and tighten properly
Engine consuming too much oil
Oil leakage: Damaged seals or gaskets - Worn parts need to be replaced
Oil viscosity is incorrect - Use oil of proper viscosity
Worn or broken piston rings - Piston rings replacement required
Valve stems or guides are damaged - Replace defective valves
Pistons or cylinder liners are worn - Inspect pistons and liners, fit new components as necessary

Electrical System Troubleshooting
Battery won’t charge
Bad cell in battery - Battery change required
Damaged battery electrical wire harness - Inspect electrical wires for damage, change or repair
Loose or corroded battery terminals and cables - Tighten or service cables and terminals
Belt slipping or wrong belt tension adjustment - Change belt or properly adjust belt tension
Starter turns slow
Low battery capacity - Recharge the battery
Battery won’t hold charge - Service charging system or replace battery
Battery wiring harness damage - Inspect battery wiring for damage, replace or repair
Corroded or loose cables and terminals - Service or tighten battery cables and terminals
Starter motor is not working
Battery capacity is low - Battery needs to be recharged
Discharged or worn battery - Replace or charge as required
Defective starter motor - Starter should be changed
Disconnected or incorrectly connected cables - Need to reconnect cables correctly

Transmission Troubleshooting
Gear shift is hard
Clutch is unadjusted or worn - Adjust clutch or replace if required
Gear shift linkage is loose or broken - Replace or repair the shift linkage
Bent or worn shift forks - Change the shift forks
Defective gearshift mechanism - Replace defective components
Transmission oil pressure is low
Oil level is low - Add transmission oil as required
Transmission fluid filter is plugged (if fitted) - Replace or clean transmission fluid filter
Relief valve is faulty - Replace relief valve
Transmission is excessively noisy
Bearings are worn or broken - Bearings need to be changed
Not enough fluid in transmission - Add transmission fluid as required
Dirty transmission oil - Fill up with fresh transmission oil
Incorrect backlash or gears are defective - Set backlash correctly or change the gears
Worn or damaged shift forks - Install new shift forks
Transmission fluid leaks
Seals or gaskets are damaged - Install new components
Cracked transmission housing - Housing needs to be replaced

Hydraulics Troubleshooting
Hydraulic system overheated
Improper hydraulic pressure adjustments - Adjust it correctly
Main relief valve is faulty or misadjusted - Adjust or change relief valve
Hydraulic oil is contaminated - Fill up with fresh hydraulic oil
Aeration in hydraulic system - Check the suction line, pump seals, and fittings
Hydraulic fluid pressure too low
Not enough hydraulic oil in the system - Add oil to the hydraulic system
Hydraulic oil filter is dirty - Change the hydraulic filter element or service if required
Hydraulic pump malfunction - Test the pump flow rate and change pump if required
Defective or not adjusted hydraulic spool valve - Replace or set properly
Broken hydraulic cylinder - Check cylinder components for wear or damage and change if necessary
Hydraulic piping leaks - Find leaks in hydraulic system and repair it
3-point hitch won't raise or raises slowly
Hydraulic oil level is insufficient - Fill up the hydraulic oil
Cold fluid in hydraulic system - Wait for fluid to warm up
Hydraulic oil filter element is dirty - Service or replace the hydraulic filter
Damaged hydraulic oil pump - Check pump flow and change pump if necessary
Main relief valve malfunction or incorrect adjustment - Replace or set up the relief valve
Hydraulic spool valve is not set properly or defective - Replace or adjust correctly
Broken hydraulic cylinder - Check cylinder components for wear or damage and change if necessary
Broken or loose suction line - Retighten or change
3-point hitch lowers slowly or won't lower
Hydraulic spool valve block is defective or set improper - Adjust properly or replace
Broken hydraulic cylinder - Check cylinder parts for wear or damage and replace if necessary
Damaged lift arm shaft - Change the shaft
Damaged mechanical components of the hitch - Replace worn or faulty hitch components
Hitch lowering or lifting is not smoothly
Air leaks in hydraulic system - Inspect the pump seals, suction pipe, and fittings
Contaminated hydraulic oil - Change hydraulic oil
Hydraulic pump is defective - Check the pump capacity and replace pump if required
Hydraulic spool valve is not set properly or defective - Adjust correctly or change
Hydraulic cylinder is faulty - Inspect cylinder components for wear or damage and change if required

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