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Home / Wheel Loaders / Kubota Wheel Loaders / Kubota RT140

Kubota RT140 Troubleshooting

The Kubota RT140 articulated wheel loader driveline system components: 68.6 cu.in (1.1L) Kubota D1105 4-cycle 3-cylinder water-cooled diesel engine with a rated power of 26 hp (19 kW), and hydrostatic transmission. The hydraulic system has a pump with a rated capacity of 11.1 gal/min (42 l/min). The system relief pressure is 2175 psi (150 bar). The Kubota RT140 is equipped with a power steering system, hydraulic wet disc brakes, and 7.00x12 tires. The wheel loader has a maximum lift height to hinge pin of 100.8" (2560 mm) and boom breakout force of 3365 lbs (1530 kg). The rated operating capacity is 640 lbs (290 kg), and tipping load is 1275 lbs (580 kg).

Engine Troubleshooting

Engine difficult to start or will not start
Air in fuel system - Bleed fuel system.
Clogged fuel filter - Replace the filter element.
Dirty or damaged injection nozzles - If necessary, replace with a new nozzle.
Water or dirt in fuel system - Drain, flush, and service the system.
Valve clearance is not correct - Have it adjusted.
Defective fuel injection pump - Replacement or repair required.

Diesel starts but then stops
Air cleaner is dirty - Service or replace air cleaner.
Dirty fuel filter - Change or clean the filter element.
Fuel injection pump leakage - Check the fuel injection pump for leaks and fix it.
Defective or clogged fuel injectors - Clean fuel injectors or change it.
Fuel injection pump is damaged - Replace or rebuild injection pump.

Engine stops suddenly during operation
Engine not warmed up - Warm up engine as required.
Clogged fuel filter - Install new filter element.
Air in the fuel pipes - Bleed the fuel pipes.
Clogged or defective injection nozzles - Change fuel injection nozzles.
Wrong setting of fuel injection pump timing - Adjust as recommended.

Engine stops at idle
Too low idle RPM - Correct low idle settings.
Fuel injection pump is damaged - Repair or replace injection pump.
Dirty or defective injectors - Replace fuel injectors.
Valve clearance is out of adjustment - Adjust to proper valve clearance.

Engine lacks power
Air filter is clogged - Clean or change filter.
Clogged injection nozzle - Clean or replace injection nozzles.
Uneven fuel injection pressure - Adjust pressure to proper level.
Valve clearance is wrong - Adjust valve clearance.
Incorrectly adjusted low idle speed - Correct low idle settings.
Dirty fuel hoses or lines - Service fuel lines and hoses.
Cylinder head gasket is blown - Replace the gasket as required.
Piston rings are worn or defective - Piston rings need to be replaced.

Engine overheating
Low coolant level - Top up coolant fluid and check system for leaks.
Low engine oil level - Fill the crankcase with engine oil.
Clogged radiator fins or leaking radiator cap - Install new cap or clean radiator.
Damaged or worn fan belt - Replace as required.
Engine is overloaded - Load reducing is recommended.

Oil pressure is insufficient
Insufficient engine oil - Add oil as required.
Dirty oil filter element - Clean or replace engine oil filter element.
Different type of engine oil - Use correct viscosity oil.
Crankshaft bearing oil clearance is excessive - Replace bearings.
Oil pump is damaged - Install a new pump.

Abnormal engine knocking or noise
Engine oil insufficient - Need to add engine oil.
Engine is not preheated - Warm up to required temperature.
Improper fuel injection timing - Set it up as required.
Low idle speed adjustment is incorrect - Need to adjust idle speed.
Damaged or clogged injectors - Clean or replace fuel injectors.
Connecting rod is misaligned or defective - Need to change or align the connecting rod.
Broken or worn pistons - Pistons need to be replaced.

Hydrostatic Transmission Troubleshooting

HST transmission is excessively noisy
Transmission fluid is dirty or fluid level is too low - Add fluid to the correct level or fill the transmission with fresh fluid.
Speed control linkage is defective or unadjusted - Adjust or install new linkage.
Relief valve is damaged - Install a new relief valve.
Transmission overloaded - Reduce transmission load.
Worn or defective parts of the hydrostatic transmission - Change or repair defective parts.

Loss of power
Insufficient transmission fluid - Add fluid to the transmission housing.
Relief valve failure - Install a new relief valve.
Bent or unadjusted speed control pedal linkage - Adjust or replace linkage.

Transmission fluid overheats
Lack of transmission fluid - Check and refill the transmission fluid.
Transmission fluid filter is clogged - Clean or change transmission fluid filter.
Cooling components are damaged or clogged - Check all cooling components and change or clean if required.
Excessive loading - Reduce transmission load.

Transmission oil leaking
Damaged seals or gaskets - Change defective gaskets or seal.
High internal transmission case pressure - Replace worn components.
Plugged transmission fluid return tube - Service or replace return tube.

Hydraulics Troubleshooting

Hydraulic system overheated
Hydraulic pressure is incorrect - Hydraulic pressure must be set correctly.
Faulty or improperly adjusted main relief valve - Set up or change the relief valve.
Hydraulic fluid contamination - Hydraulic fluid change required.
Lack of hydraulic oil - Fill the hydraulic system with oil.
Faulty hydraulic oil pump - Install new pump or repair it.

Lift arm can't drop or lift
Damaged lift controls - Repair or change.
Hydraulic pump not working - Change or repair hydraulic pump if required.
Hydraulic control valve malfunction - Repair or change the valve.
Broken hydraulic cylinder - Repair or change hydraulic cylinder.
Hydraulic fluid is insufficient - Checking hydraulic fluid level and add if necessary.

Bucket tilt does not work
Faulty bucket tilt controls - Change or repair.
Hydraulic pump malfunction - Repair or install new hydraulic pump.
Damaged hydraulic control valve - Repair or change the valve.
Damaged bucket cylinder - Change or repair cylinder.
Low hydraulic oil level - Need to add oil.

Bucket or lift arm runs slowly
Hydraulic pump is worn - Check pump capacity and change if necessary.
Hydraulic cylinder oil leakage - Install new cylinder seals.
Hydraulic oil is insufficient - Check and refill the hydraulic oil.
Hydraulic control valve is defective or set improper - Repair or set properly.
Hydraulic pressure loss - Adjust it correctly.

Bucket or boom is working jerkily
Air leaks in hydraulic system - Air bleeding is required.
Plugged hydraulic oil filter - Clean or replace the filter.
Hydraulic oil is contaminated - Change hydraulic oil.
Cylinder rod or tube is scuffed - Replace defective component.

Hydraulic pump makes excessive noise
Leaking hydraulic system or insufficient oil level - Refill hydraulic oil or repair leaks in system.
Plugged hydraulic filter - Clean or install new filter.
Plugged suction line - Suction line must be serviced.
Air trapped in hydraulic pump - Remove air from hydraulics.
Faulty pump parts - Change or rebuild pump.

Electrical Troubleshooting

Battery won’t charge
Electrical wire connections are loose or corroded - Service or tighten connections.
Battery terminal clamps are defective - Terminal clamps should be changed.
Battery dead cell - Use a new battery.
Worn or loose belt - Change belt or adjust belt tension.

Starter motor turns slow
Low battery output - Charge the battery.
Battery drains quickly - Service charging system or install new battery.
Faulty battery terminals or disconnected cables - Check wire connections and change or service terminals.

Starter will not work
Battery is low or faulty - Recharge or change battery.
Battery wires are disconnected or incorrectly connected - Check wires and connect correctly.
Low battery voltage - Low battery charging, charge as required.
Starter motor failure - Change or repair starter.

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