________________________________________________________________________________________
Kubota M8950 Troubleshooting
The
Kubota M8950 is a 2-wheel drive or 4-wheel drive utility tractor from M50
Series. This model was manufactured between 1984 and 1993. The Kubota M8950
tractor is powered by 262 cu.in (4.3 L) Kubota V4300-TA 4-cylinder turbocharged
liquid-cooled diesel engine with a rated power of 96 hp (71.6 kW) at 2400 rpm.
The tractor is fitted with a partial powershift transmission with 24 forward and
8 reverse gears. The maximum forward speed - 18.6 mph (29.9 km/h), maximum
reverse speed - 6.9 mph (11.1 km/h).
The open center hydraulic system has a gear pump with a rated capacity
of 11 gal/min (41.6 l/min). The hydraulic system pressure is 181 bar
(2630 psi). The 2WD models are equipped with 10.0x16 front tires and
18.4x34 rear tires. The 12.4x24 front tires and 18.4x34 rear tires are
used for 4WD tractors. Compatible attachments for the Kubota M8950
tractor: Kubota M1860A loader
with a lift capacity to full height of 2650 lbs (1202 kg) and breakout
force of 4640 lbs (2104 kg).
| Engine Troubleshooting |
| Diesel will not start or hard to start |
| Dirty fuel filter element - Clean or replace the filter |
| Fuel supply valve is closed - Open fuel supply valve |
| Air in fuel lines - Bleed fuel lines |
| Clogged or damaged injectors - Service or change fuel injectors |
| Fuel injection pump is not working correctly - Change pump or rebuild it |
| Low compression - Inspect cylinder block and change defective components |
| Diesel shuts off during operation |
| Engine is not preheated - Warm up engine as required |
| Fuel lines leaking air - Tighten clamps, change faulty pipes |
| Irregular fuel injection - Adjust fuel injection timing |
| Clogged fuel filter element - Change filter element |
| Fuel injectors are damaged or dirty - Check fuel injectors and replace if required |
| Engine starts and stalls immediately |
| Incorrect setting of fuel injection pump timing - Fuel injection pump timing adjustment needs to be corrected |
| Fuel filter clogging - Change filter element |
| Faulty fuel injector nozzles - Test injector nozzles and replace as required |
| Fuel injection pump is defective - Replace injection pump or repair it |
| Air cleaner element clogging - Service or change air cleaner |
| Too low idle RPM - Normalize low idle speed |
| Fuel injection pump damage - Repair or change injection pump |
| Fuel injector nozzles fault - Service or replace injector nozzles |
| Valve clearance is out of adjustment - Adjust valve clearance according to specifications |
| Coolant level is low - Top up coolant fluid. Check for coolant leaks |
| Cooling system parts are defective or system is clogged - Service the cooling system or change faulty parts |
| Low engine oil level - Add oil to the engine crankcase |
| Damaged fan belt or unadjusted belt tension - Adjust belt tension correctly or replace it |
| Thermostat malfunction - Replace the thermostat |
| Clogged fuel injectors - Service or change fuel injectors |
| Improper fuel injection pressure - Repair or replace injection pump |
| Air filter element clogging - Service or change air filter |
| Oil filter element is dirty - Replace or clean engine oil filter element |
| Diesel engine is overloaded - Reduce the load or use a lower gear |
| Valve clearance is out of adjustment - Adjust valve clearance |
| Low idle speed setting is incorrect - Adjust low idle speed |
| Fuel pipes or hoses are dirty - Fuel hoses and pipes must be clean |
| Insufficient engine compression: Valves are broken or leaking - Replace the valves as required |
| Abnormal engine knocking or noise |
| Incorrectly set fuel injection pump timing - Repair or replace fuel injection pump |
| Damaged or clogged injector nozzles - Change or clean injector nozzles |
| Engine oil level is insufficient - Check oil level and add oil as required |
| Engine not warmed up - Warm up the engine |
| Main bearings or crankshaft failure - Repair or replace defective parts |
| Piston rings failure - Replace the piston rings as required |
| Flywheel bolts are loose - Bolts need to be tightened |
| High engine oil consumption |
| Oil leakage: Worn seals or gaskets - New components need to be installed |
| Crankcase oil too light - Use proper viscosity oil |
| Piston rings are defective or worn - Piston rings replacement required |
| Damaged valve guides or valve stems - Need to replace the valves |
| Cylinder liners or pistons are scored - Inspect liners and pistons, fit new parts as necessary |
| Electrical System Troubleshooting |
| Battery won’t charge |
| Battery dead cell - Use a new battery |
| Battery wiring harness damage - Inspect battery wiring for damage, replace or repair |
| Corroded or loose cables and terminals - Terminals and cables need to be tightened or cleaned |
| Belt damage or incorrect belt tension adjustment - Replace belt or correctly adjust belt tension |
| Battery voltage is low - Battery needs to be recharged |
| Battery is not holding charge - Service charging system or replace battery |
| Damaged battery electrical wire harness - Inspect electrical wires for damage, change or repair |
| Loose or corroded cables and terminals - Tighten or service cables and terminals |
| Low battery power - Low battery charging, charge as required |
| Discharged or faulty battery - Change or recharge battery |
| Starter motor failing - Repair or replace starter |
| Disconnected or incorrectly connected cables - Need to reconnect cables correctly |
| Transmission Troubleshooting |
| Difficulty shifting gears |
| Incorrectly adjusted or damaged clutch - Clutch replacement or adjustment required |
| Loose or broken gear shift linkage - Replace or repair the shift linkage |
| Bent or worn shift forks - Shift forks need to be replaced |
| Worn gear shift mechanism - Replace worn components |
| Low transmission oil pressure |
| Low transmission oil level - Check transmission oil level and add oil as required |
| Plugged transmission fluid filter (if equipped) - Change or clean the transmission fluid filter |
| Relief valve is defective - Replace valve as required |
| Transmission is excessively noisy |
| Damaged or worn bearings - Change faulty bearings |
| Low transmission fluid level - Fill up the transmission fluid |
| Transmission fluid contamination - Transmission fluid must be changed |
| Incorrect backlash or gears are defective - Change the gears or adjust backlash correctly |
| Bent or worn shift forks - Install new shift forks |
| Broken gaskets or seals - Gaskets or seal need to be replaced |
| Transmission housing is cracked - Replace housing or transmission assembly |
| Hydraulics Troubleshooting |
| Hydraulic system is too hot |
| Hydraulic system pressure is incorrect - Hydraulic pressure needs to be set correctly |
| Main relief valve malfunction or incorrect adjustment - Adjust relief valve or change if required |
| Hydraulic oil contamination - Change the oil |
| Air in hydraulic system - Check the pump seals, suction line, and fittings |
| Low hydraulic system pressure |
| Lack of hydraulic fluid - Need to add fluid |
| Hydraulic oil filter element is dirty - Clean or change hydraulic filter |
| Damaged hydraulic oil pump - Test pump performance and replace pump if necessary |
| Hydraulic control valve is faulty or out of adjustment - Adjust correctly or change |
| Hydraulic cylinder is not working - Inspect the hydraulic cylinder parts for damage or wear and replace if required |
| Leakage in hydraulic pipes - Identify leaks in the system and repair it |
| Three-point hitch lifting is too slow or cannot be lifted |
| Hydraulic oil level is low - Check oil level and add hydraulic oil as required |
| Cold hydraulic fluid - Warm up the fluid |
| Hydraulic fluid filter element is dirty - Change hydraulic filter element or clean if necessary |
| Hydraulic pump malfunction - Test the pump flow rate and change pump if required |
| Main relief valve is damaged or adjusted improperly - Adjust relief valve or change if required |
| Damaged or incorrect adjusted hydraulic control valve - Adjust properly or change |
| Hydraulic cylinder malfunction - Inspect the hydraulic cylinder components for damage or wear and change if required |
| Broken or disconnected suction line - Connect or replace |
| Hitch won't lower or lowers slowly |
| Hydraulic spool valve block is faulty or out of adjustment - Set correctly or replace |
| Hydraulic cylinder is not working - Check the hydraulic cylinder parts for damage or wear and replace if necessary |
| Damaged hitch cross shaft - Replace the shaft |
| The hitch is defective if there is internal mechanical damage - Change faulty or worn hitch components |
| Hitch jerks when drop or lift |
| Air in hydraulic system - Check the pump seals, suction pipe, and fittings |
| Hydraulic fluid is contaminated - Fill up with new hydraulic fluid |
| Hydraulic pump not working - Flow-rate hydraulic pump and replace pump if necessary |
| Hydraulic spool valve block is defective or set improper - Change or set correctly |
| Broken hydraulic cylinder - Check the hydraulic cylinder components for damage or wear and change if necessary |
________________________________________________________________________________________
________________________________________________________________________________________
| Farm Tractors Technical Specifications |
