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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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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