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Kubota M105S Troubleshooting
The
Kubota M105S farm tractor was manufactured from 2005 to 2007. The tractor was
designed in 2 versions: M105H (2WD, ROPS) and M105HD (4WD, ROPS). The Kubota
M105S is powered by Kubota V3800-DI-TI 4-cylinder direct injection turbocharged
diesel engine.
A 230 cubic inches (3.8 L) engine has a cylinder bore of 3.94" (100 mm),
piston stroke of 4.72" (120 mm), and rated power of 105 hp (78.3 kW).
The Kubota M105S tractor is fitted with 3 types of transmission. Type 1:
16x16 Swing Shift partially synchronized transmission. Type 2: 32x32
Swing Shift Plus Dual Speed partial powershift transmission. Type 3:
24x24 Swing Shift transmission with creeper. Max. forward speed - 21.4
mph (34.5 km/h), max. reverse speed - 21.4 mph (34.5 km/h).
The open center hydraulic system includes a gear pump with a flow rate
of 17.2 gpm (65.1 lpm). The hydraulic pressure is 196 bar (2845 psi).
The Kubota M105S was equipped with a hydrostatic power steering,
hydraulic wet disc brakes, 10.00x16 (2WD) or 13.6x24 (4WD) front tires,
and 18.4-34 rear tires. The wheelbase is 95.9 in (2430 mm).
| Engine Troubleshooting |
| Engine will not start or starts up hard |
| Fuel filter is clogged - Service the filter |
| Closed fuel cock - Open fuel on-off cock to inject fuel |
| There is air in the fuel system - Bleed the system |
| Dirty or faulty injectors - Inspect fuel injectors and replace if necessary |
| Fuel injection pump is not operating properly - Change or repair the pump |
| Low engine compression - Check cylinder block and change worn components |
| Diesel stalls while running |
| Engine not warmed up - Normalize the temperature by warming up the engine |
| Air in fuel system - Air-bleed fuel system |
| Improper fuel injection - Fuel injection settings required |
| Fuel filter is clogged - Filter maintenance required |
| Dirty or damaged injectors - Test fuel injectors and change if necessary |
| Diesel engine stops after starting |
| Fuel injection pump timing is incorrect - Check and correct settings |
| Plugged fuel filter - Install new filter element |
| Fuel injector nozzles fault - Replace fuel injector nozzles |
| Damaged fuel injection pump - Replace or repair injection pump |
| Air cleaner element is clogged - Install new cleaner element or replace it |
| Engine stops while idling |
| Incorrect low idle speed adjustment - Need to adjust idle speed |
| Fuel injection pump malfunction - Replacement or repair required |
| Clogged or defective injector nozzles - Change injector nozzles |
| The valve clearance is not adjusted - Adjust to proper valve clearance |
| Coolant level is low - Fill radiator to proper level. Check radiator and hoses for leaks |
| Cooling system components are defective or system is clogged - Service the cooling system or change faulty parts |
| Not enough engine oil - Check and refill engine oil |
| Incorrect fan belt tension or broken belt - Adjust correctly or install new belt |
| Defective or wrong type of thermostat - Test thermostat opening temperature, replace as required |
| Dirty or damaged injectors - Service or change fuel injectors |
| Fuel injection pressure is wrong - Repair or replace injection pump |
| Air filter element is dirty - Replace filter or install new filter element |
| Dirty oil filter element - Replace or clean engine oil filter element |
| Engine overloaded - Load reducing required |
| Improper valve clearance - Adjust to proper valve clearance |
| Incorrectly adjusted low idle speed - Adjustment required |
| Dirt in the fuel pipes or hoses - Clean fuel system hoses and pipes |
| Engine compression too low: Intake or exhaust valves are damaged - Have valves replaced |
| Abnormal engine noise or knocking |
| Fuel injection pump out of timing - Adjust injection timing |
| Dirty or defective injector nozzles - Service or replace nozzles if required |
| Low engine oil level - Need to add engine oil |
| Engine not warmed up - Warm up engine as required |
| Worn crankshaft or main bearings - Have bearings or crankshaft replaced |
| Broken or worn piston rings - Replace piston rings |
| Flywheel bolts are loose - Bolts need to be tightened |
| Oil leaks: Gaskets or seals can be faulty - To repair leaks, replace worn parts |
| Incorrect oil viscosity - Fill up with the correct oil viscosity |
| Stuck or worn piston rings - Change piston rings |
| Damaged valve stems or valve guides - Replace the valves |
| Pistons or cylinder liners are damaged - Check pistons and liners, change as required |
| Electrical System Troubleshooting |
| Battery is not charging |
| Dead cell in battery - Replace the battery |
| Battery electrical wire harness failure - Inspect wires for defects, change or repair |
| Loose or corroded battery terminals and cables - Tighten or service cables and terminals |
| Belt is damaged or belt tension is incorrectly adjusted - Adjust belt tension properly or replace belt |
| Battery power is low - Charge the battery |
| Battery does not hold charge - Service or replace the battery |
| Bad battery wiring harness - Inspect wiring for malfunctions, replace or repair |
| Corroded or loose terminals and cables - Clean or tighten cables and terminals |
| Low battery voltage - Recharge the battery |
| Drained or worn battery - Charge or replace the battery |
| Damaged starter motor - Change or repair starter |
| Wiring harness is disconnected or improperly connected - Check wiring harness and reconnect properly |
| Transmission Troubleshooting |
| Difficult to shift gears |
| Clutch is not adjusted or faulty - Adjust or install new clutch |
| Gear shift linkage is loose or broken - Replace or repair the shift linkage |
| Worn or damaged shift forks - Shift forks need to be changed |
| Faulty gear shifting mechanism - Faulty parts must be changed |
| Low transmission fluid pressure |
| Insufficient oil supply - Checking transmission oil level and add if necessary |
| Transmission fluid filter element is dirty (if fitted) - Change or service the transmission fluid filter |
| Damaged relief valve - Replace the valve |
| Broken or worn bearings - Replace faulty bearings |
| Not enough fluid in transmission - Fill up the transmission fluid |
| Contaminated transmission fluid - Transmission fluid must be changed |
| Damaged gears or improper backlash - Set backlash correctly or change the gears |
| Damaged or worn shift forks - Replace the shift forks |
| Gaskets or seals are defective Change defective seal or gaskets |
| Cracked transmission case - Install a new transmission case |
| Hydraulics Troubleshooting |
| Hydraulic system overheating |
| Improper hydraulic pressure adjustments - Adjust it correctly |
| Unadjusted or defective main relief valve - Replace or set up the relief valve |
| Hydraulic fluid contamination - Change hydraulic fluid |
| Air in hydraulic system - Inspect the suction line, pump seals, and fittings |
| Low hydraulic fluid pressure |
| Lack of hydraulic oil - Check oil level and add hydraulic oil as required |
| Hydraulic fluid filter element is dirty - Change the hydraulic filter element or service if required |
| Damaged hydraulic oil pump - Test pump flow rate and replace pump if required |
| Faulty or incorrect setting hydraulic spool valve - Adjust properly or change |
| Hydraulic cylinder is not working - Check cylinder parts for damage or wear and replace if necessary |
| Hydraulic piping leaks - Inspect hydraulic system for leaks and repair it |
| 3-point hitch does not raise or raises very slowly |
| Hydraulic fluid level is insufficient - Check and refill the hydraulic fluid |
| Cold fluid in hydraulic system - Wait for fluid to warm up |
| Hydraulic fluid filter element is dirty - Hydraulic filter maintenance required |
| Hydraulic pump failure - Check pump flow and change pump if necessary |
| Main relief valve incorrect adjustment or failure - Adjust relief valve or change if required |
| Defective or not adjusted hydraulic control valve - Change or adjust correctly |
| Hydraulic cylinder failure - Inspect cylinder parts for wear or damage and replace if required |
| Suction line is damaged or disconnected - Connect or replace |
| Hitch won't lower or lowers slowly |
| Hydraulic spool valve is not set properly or defective - Replace or set properly |
| Hydraulic cylinder malfunction - Check the hydraulic cylinder parts for damage or wear and replace if necessary |
| Damaged hitch cross shaft - Replace the shaft |
| Internal mechanical malfunction with hitch - Replace worn or faulty hitch parts |
| Three-point hitch raises or lowers not smoothly |
| Hydraulic system sucks air - Check the pump seals, suction pipe, and fittings |
| Contaminated hydraulic oil - Change hydraulic oil |
| Hydraulic pump is defective - Check pump flow and change pump if necessary |
| Faulty or incorrect setting hydraulic spool valve - Adjust properly or change |
| Hydraulic cylinder is broken - Inspect the hydraulic cylinder parts for damage or wear and replace if required |
| Steering System Troubleshooting |
| Difficult steering |
| Defective or improperly assembled steering column - Reassemble properly or change steering column |
| Air in steering system - Bleed air from system |
| Improper toe-in - Adjust toe-in correctly |
| Deflated front tyres - Inflate tyres as needed |
| Faulty steering pump - Check the steering pump and replace if necessary |
| Damaged or worn hydrostatic steering unit - Repair or change the steering unit |
| Steering cylinder malfunction - Replace or repair hydraulic steering cylinder |
| Stuck or worn relief valve - Service or replace the relief valve |
| Low steering fluid level - Fill the steering system with fluid |
| Oil leakage in the steering system - Tighten connections of hydraulic hoses and pipes in steering system |
| Excessive play in steering |
| Steering column shaft or coupling has maximum wear - Replace faulty component |
| Hydrostatic steering unit has wear or malfunction - Inspect and change as required |
| Steering pump not working - Install a new hydraulic steering pump |
| Steering tie-rod ends or linkage are worn - Change damaged component |
| Tractor is pulling to left or right |
| Tires are incorrectly inflated - Inflate as required |
| Incorrect toe-in adjustment - Check and adjust toe-in |
| Worn or faulty steering linkage or tie-rod ends - Replace failed component |
| Defective or worn hydrostatic steering unit - Repair or replace the steering unit |
| Steering cylinder malfunction - Replace or repair hydraulic steering cylinder |
| Damaged or improperly adjusted or worn front hub bearings - Adjust properly or replace bearings |
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| Farm Tractors Technical Specifications |
