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Home / Wheel Loaders / Komatsu Wheel Loaders / Komatsu WA50-3

Komatsu WA50-3 Troubleshooting

The Komatsu WA50-3 compact wheel loader driveline system components: Komatsu S3D84E-3B 3-cylinder turbocharged diesel engine with a rated power of 37 hp (27.2 kW), and hydrostatic transmission. The hydraulic system has a gear pump with a rated capacity of 11.4 gal/min (43 l/min). The system relief pressure is 2990 psi (210 bar). The Komatsu WA50-3 is equipped with a power steering system, hydraulic wet disc brakes, and 15.5/70-18 tires. The wheel loader has a maximum lift height of 122.6" (3115 mm) and bucket breakout force of 6720 lbs (3050 kg). The rated operating capacity is 2915 lbs (1275 kg), and tipping load is 5830 lbs (2550 kg).

Engine Troubleshooting

Engine starts hard or won't start
Air in the fuel lines - Bleed the fuel lines.
Fuel filter plugging - Clean or change the filter.
Fuel injection nozzles are clogged or faulty - Test injection nozzles and change if necessary.
Water or dirt in fuel system - Drain, flush, and service the system.
Improper valve clearance - Adjustment procedure required.
Fuel injection pump failure - Repair or install new pump.

Engine starts but then stops
Air cleaner is clogged - Install new air cleaner element.
Dirty fuel filter - Change filter element.
Fuel injection pump leakage - Check the fuel injection pump for leaks and fix it.
Fuel injectors are faulty or clogged - Test and replace fuel injectors if necessary.
Faulty fuel injection pump - Replace or rebuild injection pump.

Engine shuts off while running
Low coolant temperature - Warm up the engine.
Fuel filter plugging - Clean or replace the filter.
Air trapped in fuel system - Bleed air.
Fuel injection nozzles fault - Test injection nozzles and change if necessary.
Fuel injection pump timing is not adjusted - Adjust according to specifications.

Engine stalls at idle
Incorrectly adjusted low idle speed - Test and adjust.
Fuel injection pump malfunction - Replace or repair injection pump.
Fuel injectors are faulty or clogged - Inspect fuel injectors and change as required.
Valve clearance is out of adjustment - Correct valve clearance needs to be set.

Engine power is too low
Clogged air cleaner - Clean or replace air cleaner element.
Dirty or damaged injection nozzles - Install a new kit of correctly balanced nozzles.
Insufficient fuel injection pressure - Check the fuel injection pressure and adjust if necessary.
Improper valve clearance - Adjust valve clearance according to specifications.
Low idle speed setting is not correct - Correct low idle settings.
Dirty fuel lines or hoses - Fuel hoses and lines must be clean.
Defective cylinder head gasket - Replace cylinder head gasket.
Piston rings are broken or leaking - Piston rings need to be replaced.

Engine overheating
Engine coolant is insufficient - Add coolant and check the components of cooling system.
Not enough engine oil - Add oil to the engine crankcase.
Clogged radiator fins or damaged radiator cap - Change cap or clean radiator.
Fan belt is worn or faulty - The fan belt needs to be replaced.
Engine is overloaded - Reduce engine load.

Oil pressure is low
Not enough oil in the engine - Fill the crankcase with oil.
Oil filter clogged - Service or replace engine oil filter.
Improper type of engine oil - Drain and refill with oil of correct grade and viscosity.
Excessive main bearing oil clearance - Install new bearings.
Oil pump failure - Remove and inspect oil pump.

Abnormal engine noise or knocking
Engine oil level is insufficient - Fill up the engine oil.
Low coolant temperature - Warm up engine as required.
Timing of fuel injection pump is incorrect - Set up as recommended.
Low idle speed setting is not correct - Test and adjust.
Fuel injectors are faulty or clogged - Clean fuel injectors or change it.
Connecting rod is worn or misaligned - Replace or align connecting rod.
Pistons are scored or worn - Install new pistons.

Hydrostatic Transmission Troubleshooting

HST transmission 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 install new linkage.
Relief valve is damaged - Replace the valve.
Transmission overload - The load should be reduced.
Defective or worn transmission parts - After disassembling and inspection, change defective components.

Lack of power
Transmission fluid level is low - Need to add transmission fluid.
Relief valve is stuck - Install a new relief valve.
Bent or unadjusted speed control pedal linkage - Adjust or change linkage.

Transmission fluid overheating
Low oil level - Fill up the transmission oil.
Dirty transmission fluid filter element - Clean or change transmission fluid filter.
Cooling components are plugged or defective - Check all cooling components and repair or change if required.
Excessive loading - Reduce loading.

Transmission fluid leaking
Damaged gaskets or seals - Install new components.
High internal transmission case pressure - Change defective components.
Clogged oil return pipe - Clean or change return pipe.

Hydraulics Troubleshooting

Hydraulic system is overheated
Incorrect hydraulic pressure setting - Adjust it correctly.
Defective or misadjusted main relief valve - Replace or set up the relief valve.
Hydraulic oil is contaminated - The oil must be changed.
Hydraulic oil level is insufficient - Check oil level and add hydraulic oil as required.
Faulty hydraulic oil pump - Install new pump or repair it.

Boom does not raise or lower
Lift controls are damaged - Replace or repair.
Hydraulic pump is broken - Replace or repair pump if necessary.
Hydraulic control valve is faulty - Repair or replace the valve.
Broken hydraulic cylinder - Repair or change hydraulic cylinder.
Insufficient hydraulic fluid - Add fluid as required.

Bucket fails to tilt
Faulty bucket tilt controls - Replace or repair.
Hydraulic pump malfunction - Repair or replace pump if necessary.
Defective hydraulic control valve - Repair or replace hydraulic valve.
Faulty hydraulic bucket cylinder - Install a new cylinder or repair it.
Hydraulic fluid is insufficient - Fill up the hydraulic fluid.

Boom or bucket runs slowly
Worn hydraulic oil pump - Check pump capacity and change if necessary.
Oil leaks from hydraulic cylinder - Correct leakage by changing the seals.
Insufficient hydraulic fluid - Add fluid as required.
Faulty or incorrect setting hydraulic control valve - Repair or adjust properly.
Hydraulic pressure is low - Adjust it correctly.

Lift arm or bucket is moving jerkily
Air in the hydraulic system - Bleed air from system.
Hydraulic oil filter clogging - Clean or replace the filter.
Dirty hydraulic oil - The oil must be changed.
Cylinder tube or rod is scored - Change defective component.

Excessive hydraulic pump noise
Hydraulic system leaking or not enough oil - Repair hydraulic leaks or add oil as required.
Plugged hydraulic filter - Clean or change the filter.
Suction line is dirty - Suction line must be serviced.
Air in hydraulic pump - Bleed air from hydraulics.
Faulty pump components - Replace or rebuild the pump.

Electrical Troubleshooting

Battery won’t charge
Corroded or loose wire connections - Clean or tighten wiring connections.
Battery terminal connectors are faulty - Install new terminal connectors.
Battery is worn - Battery change required.
Worn or loose belt - Adjust belt tension or install a new belt.

Starter motor cranks slow
Battery power is low - Charge the battery.
Battery discharges quickly - Service charging system or change battery.
Battery cables are disconnected or terminals are faulty - Connect wires properly or change terminals.

Starter will not crank
Battery is low or faulty - Charge or change the battery.
Wiring is incorrectly connected or disconnected - Inspect wiring and connect correctly.
Low battery capacity - Battery needs to be recharged.
Starter motor is damaged - Repair or replace starter.

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WHEEL LOADERS SPECIFICATIONS

Caterpillar