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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 |
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 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 |
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 |
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 |
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 |
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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Farm Tractors Technical Specifications |