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Home / Wheel Loaders / Kubota Wheel Loaders / Kubota R430

Kubota R430 Troubleshooting

The Kubota R430 wheel loader driveline system components: a 111.4 cu.in (1.8L) Kubota D1803-CR-TE4 3-cylinder turbocharged water-cooled diesel engine with a rated power of 44.5 hp (33.2 kW), and 2-range hydrostatic transmission. The hydraulic system has a pump with a rated capacity of 11.1 gal/min (42.1 l/min). The system relief pressure is 2755 psi (190 bar). The Kubota R430 is equipped with a power steering system, wet disc brakes, and 12.5/70x16 tires. The wheel loader has a maximum lift height of 110.4" (2805 mm) and breakout force of 5850 lbs (2660 kg). The rated operating capacity is 1915 lbs (870 kg), and tipping load is 3830 lbs (1740 kg).

Engine Troubleshooting

Engine hard to start or will not start
Air trapped in fuel system - Bleed air.
Dirty fuel filter - Service or replace the filter.
Fuel injection nozzles are faulty or clogged - Clean or replace injection nozzles.
Dirt or water in fuel system - Drain water or flush dirt from the system.
Valve clearance is not correct - Correct valve clearance needs to be set.
Damaged fuel injection pump - Repair or replace injection pump.

Engine starts and stops suddenly
Dirty air filter - Replace or clean air filter element.
Fuel filter plugging - Replace the filter element.
Fuel injection pump is leaking - Repair any leaks.
Damaged or clogged injectors - Change or clean fuel injectors.
Fuel injection pump is broken - Replace injection pump or repair it.

Engine stops running suddenly
Engine is not preheated - Warm up to required temperature.
Fuel filter is plugged - Change the filter element.
Air in the fuel system - Air bleeding.
Fuel injection nozzles are dirty or defective - If necessary, replace with a new nozzle.
Fuel injection pump timing is not adjusted - Adjust as recommended.

Engine shuts off while idling
Too low idle RPM - Correct low idle settings.
Fuel injection pump malfunctioning - Install a new pump or rebuild.
Defective fuel injectors - Replace fuel injectors.
Improper valve clearance - Correct valve clearance needs to be set.

Low engine power
Clogged air filter - Replace or clean air filter element.
Dirty or damaged injection nozzles - If necessary, replace with a new nozzle.
Insufficient fuel injection pressure - Adjust to proper pressure.
Incorrect valve clearance - Check and adjust.
Too low idle RPM - Adjustment required.
Clogged fuel lines or hoses - Clean fuel system hoses and lines.
Cylinder-head gasket is broken - Replace the gasket as required.
Piston rings are defective or leaking - Piston rings need to be replaced.

Engine overheats
Low coolant level - Add coolant fluid to cooling system and also check it for leaks.
Engine oil insufficient - Need to add engine oil.
Radiator core is dirty or radiator cap is damaged - Install new cap or clean radiator.
Loose or damaged fan belt - Fan belt must be replaced.
Engine overload - Reduce engine load.

Low oil pressure
Low oil level - Need to add oil.
Oil filter is clogged - Service or replace engine oil filter.
Improper type of engine oil - Fill up with the correct oil viscosity.
Incorrect oil clearance in crankshaft bearing - Bearing replacement required.
Oil pump is defective - Remove and inspect oil pump.

Engine noise or knocking
Engine oil level is insufficient - Need to add engine oil.
Engine is cold - Warm up the engine.
Fuel injection pump timing is not adjusted - Set up as recommended.
Incorrect low idle speed adjustment - Correct the settings.
Fuel injectors are dirty or defective - Clean or replace fuel injectors.
Connecting rod is defective or misaligned - Replace or align connecting rod.
Worn or broken pistons - Pistons need to be replaced.

Hydrostatic Transmission Troubleshooting

Excessive hydrostatic transmission noise
Transmission oil is contaminated or oil level is insufficient - Fill to required level or change the transmission oil.
Speed control pedal linkage is damaged or out of adjustment - Adjust or install new linkage.
Stuck relief valve - Replace relief valve.
Excessive loading - Load needs to be reduced.
Transmission parts are worm or defective - After disassembly and inspection, replace defective components.

Power is too low
Insufficient transmission fluid - Need to add transmission fluid.
Relief valve malfunction - Replace the valve.
Speed control linkage is worn or unadjusted - Adjust or replace linkage.

Transmission fluid is too hot
Insufficient transmission oil - Fill the transmission housing to proper oil level.
Plugged transmission oil filter - Clean or replace the transmission filter.
Cooling components are defective or plugged - Inspect all cooling components and service or change if necessary.
Transmission is under excessive load - Reduce loading.

Transmission oil leakage
Broken seals or gaskets - Install new seal or gaskets.
High internal transmission housing pressure - Check hydrostatic transmission components for defect or damage and change if necessary.
Clogged transmission fluid return pipe - Clean or change return pipe.

Hydraulics Troubleshooting

Hydraulic system is overheated
Hydraulic pressure is not correct - Adjust it correctly.
Misadjusted or defective main relief valve - Adjust or replace the relief valve.
Contaminated hydraulic oil - Hydraulic oil change required.
Hydraulic fluid level is insufficient - Need to add fluid.
Hydraulic pump is worn - Change or repair hydraulic pump if required.

Boom fails to lift or drop
Lift controls are defective - Replace or repair.
Hydraulic pump not working - Change or repair hydraulic pump if required.
Hydraulic control valve failure - Repair or replace hydraulic valve.
Damaged hydraulic cylinder - Install a new boom cylinder or repair it.
Hydraulic oil is insufficient - Fill the system to proper hydraulic oil level.

Bucket does not tilt
Defective bucket controls - Change or repair.
Hydraulic pump failure - Install new pump or repair it.
Defective hydraulic control valve - Change or repair hydraulic valve.
Hydraulic bucket cylinder is defective - Install a new cylinder or repair it.
Insufficient hydraulic oil - Fill the system to proper hydraulic oil level.

Boom or bucket functions slowly
Worn hydraulic oil pump - Check pump capacity and change if necessary.
Hydraulic cylinder leaking - Install new cylinder seals.
Hydraulic fluid is insufficient - Fill up the hydraulic fluid.
Faulty or incorrect setting hydraulic control valve - Adjust properly or repair.
Hydraulic system loosing pressure - Adjust it correctly.

Lift arm or bucket jerks when working
Air in the hydraulic system - Bleed air from system.
Hydraulic oil filter is dirty - Service or change the hydraulic filter.
Hydraulic fluid is contaminated - Fill up with fresh hydraulic fluid.
Scratched cylinder rod or tube - Replace failed component.

Hydraulic pump makes excessive noise
Hydraulic leaks or lack of oil - Correct hydraulic leaks or top up oil as needed.
Hydraulic filter is clogged - Change or clean oil filter.
Dirty suction line - Suction line must be serviced.
Air enters the pump - Bleed air.
Faulty pump parts - Rebuild or replace hydraulic pump.

Electrical Troubleshooting

Battery will not charge
Loose or corroded wire connections - Tighten or clean electrical wiring connections.
Defective battery terminal clamps - Terminal clamps need to be replaced.
Bad cell in battery - Replace the battery.
Belt is worn or loose - Belt needs to be adjusted or changed.

Starter cranks slowly
Low battery power - Battery is drained, recharge it.
Battery runs out quickly - Service charging system or change battery.
Faulty battery terminals or disconnected cables - Check cable connections and change or clean terminals.

Starter doesn't crank
Battery is low or faulty - Recharge or replace battery.
Battery cables are disconnected or improperly connected - Inspect cables and connect properly.
Low battery power - Charge the battery.
Starter motor failure - Starter should be replaced.

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WHEEL LOADERS SPECIFICATIONS

Wheel Loaders, Skid Steers, and Compact Track Loaders