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Home / Wheel Loaders / Kubota Wheel Loaders / Kubota RT100

Kubota RT100 Troubleshooting

The Kubota RT100 articulated wheel loader is powered by 43.9 cu.in (0.7L) Kubota D722 3-cylinder indirect injection water-cooled diesel engine with a rated power of 20 hp (14.9 kW) at 2200 rpm. The Kubota RT100 is equipped with a hydrostatic transmission, power steering system, hydraulic wet disc brakes, and 23x8.5-12 standard tires. The hydraulic system has a pump with fluid flow rate of 7.4 gpm (28 lpm). The hydraulic pressure is 2175 psi (150 bar). The wheel loader has a rated operating capacity of 495 lbs (225 kg) and tipping load of 990 lbs (450 kg). The max lift height is 85.4 inches (2170 mm) to hinge pin, and boom breakout force is 2575 lbs (1170 kg).

Engine Troubleshooting

Engine hard to start or doesn't start
Air in fuel tank - Bleed fuel tank.
Fuel filter element clogging - Clean or change the filter.
Fuel injection nozzles are damaged - Install a new kit of correctly balanced nozzles.
Water in the fuel system - Change fuel and repair fuel system.
Valve clearance is out of adjustment - Need to adjust valve clearance.
Fuel injection pump damage - Replace injection pump or repair it.

Diesel starts but immediately stops
Plugged air filter - Install new air filter element.
Fuel filter plugged - Change filter element.
Fuel injection pump is leaking - Repair any leaks.
Dirty or defective injectors - Clean or replace fuel injectors.
Fuel injection pump is not operating properly - Repair or replace injection pump.

Engine stops unexpectedly during operation
Engine is not preheated - Normalize the temperature by warming up the engine.
Fuel filter is plugged - Clean or replace the filter.
There is air in the fuel system - Bleed the system.
Dirty or faulty injection nozzles - Replace injection nozzles.
Improper setting of fuel injection pump timing - Adjust the pump as required.

Engine stalls when idle
Wrong adjustment of low idle speed - Test and adjust.
Fuel injection pump is faulty - Replace injection pump or repair it.
Damaged or clogged injectors - Inspect fuel injectors and change as required.
Improper valve clearance - Adjust valve clearance.

Diesel power loss
Clogged air filter - Replace or clean air filter element.
Fuel injection nozzles are damaged - Replace injection nozzles.
Incorrect fuel injection pressure - Adjust to correct pressure.
Excessive valve clearance - Need to adjust valve clearance.
Too low idle RPM - Test and adjust.
Clogged fuel lines or hoses - Fuel lines and hoses need to be cleaned.
Damaged cylinder-head gasket - Install new cylinder head gasket.
Leaking or damaged piston rings - Replace piston rings.

Engine overheated
Low engine coolant - Fill the cooling system and check components for leaks or other faults.
Not enough engine oil - Add oil to the engine crankcase.
Defective radiator cap or clogged radiator core - Clean radiator or replace cap.
Loose or damaged fan belt - The fan belt needs to be replaced.
Engine overloaded - Reduce load on the engine.

Insufficient oil pressure
Engine oil level low - Check oil level and add oil as required.
Clogged oil filter element - Clean or change engine oil filter.
Oil grade or viscosity is incorrect - Use proper viscosity oil.
Incorrect oil clearance in main bearing - Install new bearings.
Oil pump malfunction - Repair or replace.

Engine noises or knocks
Engine oil level low - Add oil to the engine crankcase.
Engine is not fully warmed up - Warm up engine as required.
Incorrect adjustment of fuel injection pump timing - Adjust the pump as required.
Incorrectly adjusted low idle speed - Adjustment required.
Fuel injectors are faulty or clogged - Clean fuel injectors or change it.
Faulty or misaligned connecting rod - Connecting rod needs to be aligned or changed.
Worn or broken pistons - Install new pistons.

Hydrostatic Transmission Troubleshooting

HST transmission makes noise
Oil is dirty or oil level is too low - Add oil to the correct level or fill the transmission with fresh oil.
Speed control pedal linkage is bent or not adjusted - Adjust or change linkage.
Relief valve is stuck - Change relief valve.
Transmission overload - The load should be reduced.
Damaged or worn components of hydrostatic transmission - After disassembly and inspection, replace defective components.

Loss of power
Insufficient transmission oil - Fill the transmission housing to proper oil level.
Relief valve malfunction - Change relief valve.
Speed control linkage is worn or unadjusted - Adjust or change linkage.

Transmission fluid overheated
Transmission fluid insufficient - Need to add transmission fluid.
Transmission oil filter is dirty - Clean or change transmission oil filter.
Defective or plugged cooling components - Inspect all cooling components and replace or clean if necessary.
Excessive transmission load - Reduce the load is required.

Transmission fluid leakage
Damaged gaskets or seals - Install new gaskets or seal.
Internal transmission housing pressure is too high - Check transmission parts for damage or wear and replace if required.
Clogged oil drain line - Clean or replace drain line.

Hydraulics Troubleshooting

Hydraulic system overheating
Hydraulic pressure incorrectly adjusted - Correct adjustment is required.
Misadjusted or defective main relief valve - Adjust or replace the relief valve.
Contaminated hydraulic fluid - Change hydraulic fluid.
Not enough hydraulic fluid in the system - Add fluid to the hydraulic system.
Hydraulic pump is worn - Replace or repair pump if necessary.

Boom won't lower or raise
Lift controls failure - Change or repair.
Hydraulic pump is broken - Replace or repair pump if necessary.
Hydraulic control valve is faulty - Repair or change hydraulic valve.
Faulty hydraulic cylinder - Install a new boom cylinder or repair it.
Hydraulic oil is insufficient - Fill the system to proper hydraulic oil level.

Bucket can't tilt
Bucket controls are faulty - Replace or repair.
Hydraulic pump failure - Replace or repair pump if necessary.
Defective hydraulic control valve - Change or repair hydraulic valve.
Hydraulic bucket cylinder is defective - Repair or replace cylinder.
Hydraulic fluid is insufficient - Fill up the hydraulic fluid.

Slow boom or bucket operation
Defective hydraulic pump - Check hydraulic pump flow and replace pump if necessary.
Leaking hydraulic cylinder - Change cylinder piston seals.
Insufficient hydraulic fluid - Checking hydraulic fluid level and add if necessary.
Damaged or incorrect adjusted hydraulic control valve - Set correctly or repair.
Hydraulic system loosing pressure - Set pressure correctly.

Lift arm or bucket movements are jerky
Hydraulic system is leaking air - Bleed hydraulic system.
Hydraulic oil filter is clogged - Replace or clean the filter.
Hydraulic fluid is contaminated - The fluid must be changed.
Scored cylinder tube or rod - Replace worn component.

Hydraulic pump is noisy
Lack of oil or hydraulic leakage - Repair hydraulic leaks or add oil as required.
Dirty hydraulic filter - Clean or change the filter.
Clogged suction line - Service the suction line.
Air enters the pump - Bleed air.
Pump parts are faulty - Rebuild or install new pump.

Electrical Troubleshooting

Battery does not charge
Corroded or loose wire connections - Service or tighten cable connections.
Defective battery terminal clamps - Replace terminal clamps.
Faulty cell in battery - Replace the battery.
Damaged or loose belt - Need to adjust belt tension or replace belt.

Starter cranks slowly
Battery power is low - Low battery charging, charge as required.
Battery is not holding charge - Service battery or change it.
Wires are disconnected or battery terminals are corroded - Check cable connections and replace or service terminals.

Starter does not work
Battery is discharged or worn - Recharge or replace battery.
Wiring harness is disconnected or improperly connected - Check wiring harness and connect as required.
Battery voltage is low - Recharge the battery.
Starter motor failing - Starter needs to be replaced.

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WHEEL LOADERS SPECIFICATIONS

Wheel Loaders, Skid Steers, and Compact Track Loaders