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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 |