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Home / Wheel Loaders / Kubota Wheel Loaders / Kubota RT280

Kubota RT280 Troubleshooting

The Kubota RT280 articulated wheel loader driveline system components: Kubota V1505-T 4-cylinder turbocharged liquid-cooled diesel engine with a rated power of 44 hp (33 kW), and 2-range hydrostatic transmission. The hydraulic system has a pump with a rated capacity of 13.5 gal/min (51 l/min). The system relief pressure is 3045 psi (210 bar). The Kubota RT280 is equipped with a power steering system, hydraulic wet disc brakes, and 11.5/80-15.3 tires. The wheel loader has a maximum lift height of 98.4" (2500 mm) and bucket breakout force of 5280 lbs (2400 kg). The rated operating capacity is 1650 lbs (750 kg), and tipping load is 3300 lbs (1500 kg).

Engine Troubleshooting

Engine difficult to start or won't start
Air in the fuel system - Air bleeding.
Fuel filter element is dirty - Change filter element.
Fuel injection nozzles are damaged or dirty - Inspect nozzles and replace if necessary.
Dirt or water in fuel system - Drain water or flush dirt from the system.
Incorrect valve clearance - Check and adjust.
Fuel injection pump is not working correctly - Rebuild or replace pump.

Diesel starts but stalls immediately
Air cleaner is dirty - Clean or replace air cleaner element.
Clogged fuel filter - Change filter element.
Fuel injection pump has loose connections - Tighten the connections.
Damaged or clogged injectors - Replace or clean fuel injectors.
Defective fuel injection pump - Repair or change injection pump.

Engine stalls while running
Engine is not warmed up to required temperature - Warm up engine as required.
Fuel filter is plugged - Clean or change the filter.
There is air in the fuel system - Bleed the system.
Fuel injection nozzles fault - Test injection nozzles and change if necessary.
Incorrect adjustment of fuel injection pump timing - Use the correct fuel injection pump timing adjustment.

Engine stops when idling
Incorrect low idle speed adjustment - Correct low idle settings.
Defective fuel injection pump - Install a new fuel pump or repair.
Fuel injectors are dirty or defective - Clean or replace fuel injectors.
Improper valve clearance - Correct valve clearance.

Engine power is too low
Air filter is clogged - Clean or replace element.
Faulty or dirty injection nozzles - Service or change injection nozzles.
Fuel injection pressure is wrong - Adjust to correct pressure.
Valve clearance is out of adjustment - Adjustment procedure required.
Wrong adjustment of low idle speed - Correct the settings.
Fuel hoses or lines are clogged - Clean fuel hoses and lines.
Defective cylinder head gasket - Cylinder-head gasket replacement required.
Leaking or defective piston rings - Install new piston rings.

Engine overheats
Lack of coolant in cooling system - Refill to the correct level and inspect system for leaks.
Lack of engine oil - Fill up the engine oil.
Damaged radiator cap or dirty radiator core - Clean radiator or change cap.
Damaged or worn fan belt - Install new fan belt.
Engine overload - Load reducing required.

Low oil pressure
Low oil level - Need to add oil.
Engine oil filter is plugged - Replace or clean engine oil filter element.
Incorrect engine oil Drain crankcase and refill with correct oil.
Incorrect oil clearance in main bearing - Replace bearings.
Oil pump is defective - Repair or change.

Engine noises or knocks
Not enough engine oil - Checking oil level and add if necessary.
Low coolant temperature - Normalize the temperature by warming up the engine.
Fuel injection pump timing is not adjusted - Adjust the pump as required.
Low idle speed setting is incorrect - Adjust low idling as recommended.
Clogged or defective injectors - Replace or clean fuel injectors.
Connecting rod is misaligned or defective - Align or replace connecting rod.
Broken or worn pistons - Pistons replacement required.

Hydrostatic Transmission Troubleshooting

HST transmission makes excessive noise
Fluid is contaminated or fluid level is insufficient - Add fluid to the correct level or fill the transmission with fresh fluid.
Bent or unadjusted speed control pedal linkage - Adjust or repair linkage.
Relief valve is stuck - Replace the valve.
Transmission overload - Reduce transmission load.
Transmission parts are worm or defective - Check internal transmission parts for damage or wear and replace if required.

Lack of power
Insufficient transmission fluid - Checking transmission fluid level and add if necessary.
Relief valve is damaged - Change the valve.
Worn or unadjusted speed control linkage - Adjust or install new linkage.

Transmission overheats
Lack of transmission fluid - Checking transmission fluid level and add if necessary.
Transmission oil filter is clogged - Service or change transmission oil filter.
Damaged or clogged cooling components - Check all cooling components and clean or replace if required.
Transmission overload - The load should be reduced.

Transmission oil leakage
Damaged seals or gaskets - Install new components.
High internal transmission housing pressure - Replace worn components.
Clogged oil return pipe - Clean or change return pipe.

Hydraulics Troubleshooting

Hydraulic system has overheating
Hydraulic pressure is incorrect - Adjust pressure correctly.
Main relief valve failure or improper setting - Adjust relief valve or change if required.
Contaminated hydraulic fluid - Change hydraulic fluid.
Not enough hydraulic fluid in the system - Fill the hydraulic system with oil.
Defective hydraulic pump - Replace or repair pump if necessary.

Boom won't lower or raise
Faulty lift controls - Change or repair.
Defective hydraulic pump - Repair or change pump if required.
Hydraulic control valve is defective - Install a new valve or repair it.
Hydraulic cylinder not working - Install a new boom cylinder or repair it.
Low hydraulic fluid level - Checking hydraulic fluid level and add if necessary.

Bucket does not function
Bucket controls are faulty - Repair or replace.
Hydraulic pump failure - Repair or replace pump if necessary.
Hydraulic control valve is faulty - Replace or repair the valve.
Hydraulic bucket cylinder not working - Replace or repair cylinder.
Insufficient hydraulic oil - Check and refill the hydraulic oil.

Slow boom or bucket operation
Defective hydraulic pump - Check hydraulic pump flow and replace pump if necessary.
Leaking hydraulic cylinder - Install new cylinder seals.
Hydraulic fluid is insufficient - Checking hydraulic fluid level and add if necessary.
Defective or not adjusted hydraulic control valve - Set properly or repair.
Hydraulic pressure is low - Hydraulic pressure must be set correctly.

Bucket or boom movements are jerky
Air in hydraulic system - Bleed air from system.
Hydraulic oil filter element clogging - Service or change the hydraulic filter.
Contaminated hydraulic oil - Hydraulic oil change required.
Cylinder rod or tube is scuffed - Replace worn component.

Hydraulic pump is excessively noisy
Not enough oil or hydraulic system leaking - Refill hydraulic oil or repair leaks in system.
Plugged hydraulic filter - Clean or change the filter.
Suction line is clogged - Suction line must be serviced.
Pump sucks air - Bleed air from hydraulics.
Worn pump parts - Rebuild or replace hydraulic pump.

Electrical Troubleshooting

Battery won’t charge
Electrical wire connections are corroded or loose - Service or tighten connections.
Defective electrical terminal connectors - Terminal connectors need to be changed.
Faulty cell in battery - Install a new battery.
Belt is damaged or loose - Belt needs to be adjusted or changed.

Starter cranks slow
Low battery output voltage - Low battery charging, charge as required.
Battery drains quickly - Service or change the battery.
Corroded battery terminals or disconnected wires - Connect cables properly or replace terminals.

Starter does not work
Battery is low or faulty - Change or recharge battery.
Battery cables are disconnected or incorrectly connected - Check cables and connect as needed.
Low battery capacity - Battery is drained, charge it.
Damaged starter motor - Starter needs to be replaced.

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WHEEL LOADERS SPECIFICATIONS

Wheel Loaders, Skid Steers, and Compact Track Loaders