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Home / Wheel Loaders / Kubota Wheel Loaders / Kubota RT260-2

Kubota RT260-2 Troubleshooting

The Kubota RT260-2 wheel loader driveline system components: 91.5 cu.in (1.5L) Kubota V1505 4-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 10.6 gal/min (40 l/min). The system relief pressure is 3045 psi (210 bar). The Kubota RT260-2 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 to hinge pin of 98.4" (2500 mm) and boom breakout force of 5940 lbs (2700 kg). The rated operating capacity is 2035 lbs (925 kg), and tipping load is 4070 lbs (1850 kg).

Engine Troubleshooting

Engine hard to start or will not start
Air in the fuel pipes - Bleed the fuel pipes.
Fuel filter element is dirty - Clean the filter element.
Fuel injection nozzles are clogged or faulty - Replace injection nozzles.
Water or dirt in fuel system - Drain, flush, and service the system.
The valve clearance is not adjusted - Check and adjust.
Fuel injection pump malfunction - Rebuild or change fuel pump.

Diesel starts and then shuts off
Air filter is plugged - Replace or clean air filter element.
Fuel filter element is clogged - Change the filter element.
Fuel injection pump has loose connections - Tighten the connections.
Dirty or defective injectors - Clean fuel injectors or change it.
Damaged fuel injection pump - Rebuild or change fuel pump.

Engine shuts off suddenly while running
Engine is cold - Warm up engine as required.
Fuel filter element is dirty - Replace the filter element.
Air in the fuel system - Air bleeding.
Defective or clogged injection nozzle - Replace injection nozzles.
Timing of fuel injection pump is incorrect - Set the fuel pump timing correctly.

Engine stops when idle
Improperly adjusted low idle speed - Correct low idle settings.
Fuel injection pump is not working correctly - Repair or replace injection pump.
Damaged or clogged injectors - Replace or clean fuel injectors.
The valve clearance is not adjusted - Check and adjust.

Lack of engine power
Plugged air cleaner - Clean or replace element.
Faulty fuel injection nozzles - Service or change injection nozzles.
Insufficient fuel injection pressure - Adjust to proper pressure.
Incorrect valve clearance - Have it adjusted.
Low idle speed setting is incorrect - Correct low idle settings.
Clogged fuel hoses or lines - Clean fuel system lines and hoses.
Leaking cylinder head gasket - Cylinder-head gasket replacement required.
Worn or damaged piston rings - Piston rings need to be replaced.

Engine is overheated
Insufficient coolant - Add coolant and check the components of cooling system.
Insufficient engine oil - Add oil to the engine crankcase.
Faulty radiator cap or dirty radiator fins - Install new cap or clean radiator.
Broken or loose fan belt - Replace as required.
Engine overload - Load reducing required.

Oil pressure is low
Engine oil level low - Check and refill the oil.
Dirty oil filter - Clean or replace engine oil filter element.
Incorrect oil viscosity - Drain and refill with oil of correct grade and viscosity.
Incorrect oil clearance in main bearing - Replace bearings.
Oil pump is defective - Replace as required.

Abnormal engine noise or knocking
Low engine oil level - Fill the crankcase with engine oil.
Low coolant temperature - Warm up the engine.
Incorrect adjustment of fuel injection pump timing - Set the fuel pump timing correctly.
Improperly adjusted low idle speed - Test and adjust.
Damaged or clogged injectors - Replace or clean fuel injectors.
Connecting rod is worn or misaligned - Replace or align connecting rod.
Pistons are broken or worn - Have pistons replaced.

Hydrostatic Transmission Troubleshooting

HST transmission makes excessive noise
Transmission oil is contaminated or oil level is insufficient - Add oil to proper level or pour fresh transmission oil.
Speed control linkage is worn or unadjusted - Adjust or change linkage.
Relief valve malfunction - Replace valve as required.
Transmission overload - The load should be reduced.
Worn or defective transmission components - Check internal transmission parts for damage or wear and replace if required.

Power is too low
Low fluid level - Fill the transmission housing to proper fluid level.
Defective relief valve - Install a new valve.
Speed control linkage is defective or unadjusted - Adjust or replace linkage.

Transmission fluid overheating
Low fluid level - Need to add transmission fluid.
Transmission fluid filter is clogged - Service or replace the transmission fluid filter.
Damaged or clogged cooling components - Inspect all cooling components and service or change if necessary.
Transmission is under excessive load - The load should be reduced.

Transmission oil leakage
Seals or gaskets are worn - Change defective seal or gaskets.
High internal transmission housing pressure - Change defective parts.
Clogged transmission fluid return tube - Clean or replace return tube.

Hydraulics Troubleshooting

Hydraulic system has overheating
Hydraulic pressure is incorrect - Adjust it correctly.
Defective or misadjusted main relief valve - Set up or change the relief valve.
Dirty hydraulic oil - Hydraulic oil change required.
Lack of hydraulic fluid - Check and refill the hydraulic fluid.
Defective hydraulic pump - Install new pump or repair it.

Boom fails to lift or drop
Lift controls are damaged - Check and repair as required.
Damaged hydraulic oil pump - Replace or repair pump if necessary.
Hydraulic control valve malfunction - Repair or replace the valve.
Damaged hydraulic cylinder - Repair or replace hydraulic cylinder.
Hydraulic oil is insufficient - Need to add oil.

Bucket tilt does not work
Damaged bucket controls - Repair or change.
Hydraulic pump not working - Repair or change pump if required.
Hydraulic control valve malfunction - Install a new hydraulic valve or repair it.
Hydraulic bucket cylinder not working - Repair or install a new cylinder.
Hydraulic oil is insufficient - Need to add oil.

Slow boom or bucket operation
Faulty hydraulic oil pump - Check pump flow and install new pump if necessary.
Oil leaks from hydraulic cylinder - Replace cylinder piston seals.
Insufficient hydraulic fluid - Add fluid as required.
Faulty or incorrect setting hydraulic control valve - Adjust properly or repair.
Low hydraulic pressure - Adjust pressure correctly.

Bucket or boom is working jerkily
There is air in the hydraulic system - Bleed hydraulic system.
Dirty hydraulic oil filter - Service or change the hydraulic filter.
Hydraulic fluid contamination - Fill up with fresh hydraulic fluid.
Scored cylinder tube or rod - Replace damaged component.

Excessive hydraulic pump noise
Hydraulic leakage or low oil level - Add hydraulic oil or correct system leaks.
Clogged hydraulic filter - Clean or replace the filter.
Suction line clogging - Clean suction line as required.
Air in hydraulic pump - Bleed air from hydraulics.
Faulty pump components - Change or rebuild pump.

Electrical Troubleshooting

Battery cannot be charged
Loose or corroded wire connections - Service or tighten connections.
Defective electrical terminal connectors - Replace terminal connectors.
Bad cell in battery - Install a new battery.
Loose or defective belt - Belt needs to be adjusted or changed.

Starter turning slow
Low battery power - Recharge the battery.
Battery is draining quickly - Battery needs to be serviced or replaced.
Bad battery terminals or disconnected wiring - Check cable connections and change or clean terminals.

Starter will not work
Battery is low or faulty - Replace or charge as required.
Battery cables are disconnected or incorrectly connected - Check cables and connect as needed.
Low battery power - Low battery charging, charge as required.
Starter motor is damaged - Starter should be replaced.

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WHEEL LOADERS SPECIFICATIONS

Caterpillar