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Home / Wheel Loaders / Komatsu Wheel Loaders / Komatsu WA30-5

Komatsu WA30-5 Troubleshooting

The Komatsu WA30-5 compact wheel loader is powered by 91 cu.in (1.5L) Komatsu 3D84E-3B 3-cylinder water-cooled diesel engine with a rated power of 29 hp (21.3 kW) at 2600 rpm. The Komatsu WA30-5 is equipped with a hydrostatic transmission, power steering system, hydraulic wet disc brakes, and 12.5/70-16 standard tires. The hydraulic system has a pump with fluid flow rate of 8.5 gpm (32 lpm). The hydraulic pressure is 2990 psi (210 bar). The wheel loader has a rated operating capacity of 2145 lbs (975 kg) and tipping load of 4290 lbs (1950 kg). The maximum lift height is 105.5" (2680 mm) to hinge pin, and bucket breakout force is 5950 lbs (2700 kg).

Engine Troubleshooting

Engine starts up hard or will not start
Air in fuel tank - Bleed fuel tank.
Fuel filter element is dirty - Replace filter element.
Damaged or dirty injection nozzles - Check and replace nozzles if required.
Water in the fuel system - Change fuel and repair fuel system.
Incorrect valve clearance - Adjustment procedure required.
Fuel injection pump is faulty - Change pump or rebuild it.

Engine starts but stops suddenly
Plugged air filter - Clean or replace element.
Clogged fuel filter - Clean the filter or install new filter element.
Fuel injection pump has loose connections - Tighten the connections.
Defective or clogged fuel injectors - Test and replace fuel injectors if necessary.
Fuel injection pump failure - Change pump or rebuild it.

Engine shuts off suddenly while running
Coolant temperature is low - Warm up engine as required.
Fuel filter plugging - Replace filter element.
Air in the fuel lines - Bleed the fuel lines.
Clogged injection nozzle - Replace injection nozzles.
Wrong setting of fuel injection pump timing - Use the correct fuel injection pump timing adjustment.

Engine stops when idle
Low idle speed set incorrectly - Adjust low idle speed.
Defective fuel injection pump - Replace injection pump or repair it.
Dirty or defective injectors - Test and replace fuel injectors if necessary.
Valve clearance is wrong - Adjust valve clearance.

Diesel power loss
Plugged air filter - Clean or change filter.
Fuel injection nozzles are dirty or defective - Check injection nozzles and replace if required.
Fuel injection pressure is incorrect - Adjust to proper pressure.
Valve clearance is out of adjustment - Correct valve clearance needs to be set.
Low idle speed set incorrectly - Adjust low idle speed.
Clogged fuel hoses or lines - Clean fuel system lines and hoses.
Damaged cylinder-head gasket - Replace cylinder head gasket.
Piston rings are worn or defective - Install new piston rings.

Engine overheating
Coolant level is low - Fill radiator to proper level and check components for faults.
Lack of engine oil - Need to add engine oil.
Radiator core is clogged or radiator cap is leaking - Clean radiator or change cap.
Fan belt slipping or worn - Replace the fan belt.
Diesel engine overloaded - Load reducing is recommended.

Oil pressure too low
Insufficient engine oil - Add oil to the engine crankcase.
Oil filter is clogged - Change or clean engine oil filter element.
Improper type of engine oil - Use oil of correct viscosity.
Incorrect oil clearance in crankshaft bearing - Replace bearings.
Oil pump malfunction - Repair or replace.

Engine noises or knocks
Low engine oil level - Fill up the oil to required level.
Engine is not preheated - Warm up the engine.
Improper fuel injection timing - Set the fuel pump timing correctly.
Low idle speed setting is not correct - Need to adjust idle speed.
Fuel injectors are dirty or defective - Clean or replace fuel injectors.
Connecting rod failure or misalignment - Alignment procedure or replacement is required.
Piston wear or scoring - Replace the pistons.

Hydrostatic Transmission Troubleshooting

Hydrostatic transmission noise
Transmission fluid is dirty or fluid level is too low - Fill to required level or change the fluid.
Speed control pedal linkage is bent or not adjusted - Replace or adjust linkage.
Relief valve failure - Install a new valve.
Excessive loading - Reduce the load is required.
Defective or worn transmission parts - Replace or repair defective components.

Power is too low
Lack of transmission oil supply - Fill the transmission housing with oil.
Relief valve failure - Install a new valve.
Speed control pedal linkage is damaged or out of adjustment - Adjust or change linkage.

Transmission fluid overheating
Insufficient transmission fluid - Fill the transmission housing to proper fluid level.
Dirty transmission fluid filter - Service or change transmission fluid filter.
Damaged or clogged cooling components - Check all cooling components and change or clean if required.
Excessive loading - Load needs to be reduced.

Transmission fluid leakage
Seals or gaskets are broken - Install new seal or gaskets.
High internal transmission housing pressure - Repair or replace damaged components.
Plugged oil return tube - Clean or replace return tube.

Hydraulics Troubleshooting

Hydraulic system overheating
Hydraulic pressure incorrectly adjusted - Correct adjustment is required.
Main relief valve malfunction or improper adjustment - Adjust or replace the relief valve.
Hydraulic oil is dirty - Hydraulic oil change required.
Hydraulic oil level is insufficient - Add oil to the hydraulic system.
Faulty hydraulic oil pump - Install new pump or repair it.

Boom fails to lift or drop
Defective lift controls - Replace or repair.
Hydraulic pump not working - Repair or replace pump if necessary.
Faulty hydraulic control valve - Repair or replace the valve.
Faulty hydraulic cylinder - Repair or change hydraulic cylinder.
Hydraulic oil level low - Check and refill the hydraulic oil.

Bucket does not function
Bucket tilt controls are defective - Repair or change.
Hydraulic pump failure - Install new pump or repair it.
Defective hydraulic control valve - Repair or change hydraulic valve.
Defective bucket cylinder - Repair or change cylinder.
Low hydraulic fluid level - Fill up the hydraulic fluid.

Slow boom or bucket action
Hydraulic pump is defective - Test the pump flow rate and install new pump if required.
Hydraulic cylinder oil leakage - Correct leakage by changing the seals.
Low hydraulic oil level - Fill the system to proper hydraulic oil level.
Hydraulic control valve is unadjusted or worn - Repair or set properly.
Hydraulic system loosing pressure - Correct adjustment is required.

Lift arm or bucket is working jerkily
Air in hydraulic system - Bleed hydraulic system.
Hydraulic oil filter clogging - Clean or install new filter.
Dirty hydraulic fluid - Change hydraulic fluid.
Cylinder tube or rod scoring - Change worn component.

Hydraulic pump is excessively noisy
Leaking hydraulic system or insufficient oil level - Correct hydraulic leaks or top up oil as needed.
Hydraulic filter is clogged - Clean or install new filter.
Suction line is dirty - Clean suction line as required.
Pump is sucking air - Bleed air from hydraulics.
Pump parts are damaged - Change or rebuild pump.

Electrical Troubleshooting

Battery won’t charge
Electrical wire connections are corroded or loose - Tighten or clean connections.
Electrical terminal connectors are defective - Replace terminal connectors.
Battery failing - Replace the battery.
Loose or defective belt - Adjust belt tension or change the belt.

Starter turns slowly
Battery power is low - Charge the battery.
Battery does not hold charge - Battery needs service or replacement.
Disconnected battery cables or bad terminals - Connect cables correctly or replace terminals.

Starter doesn't crank
Battery is low or faulty - Recharge or replace battery.
Disconnected or incorrectly connected wires - Inspect battery wires and connect correctly.
Low battery output voltage - Low battery charging, charge as required.
Damaged starter motor - Repair or replace starter.

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WHEEL LOADERS SPECIFICATIONS

Caterpillar