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Home / Wheel Loaders / Komatsu Wheel Loaders / Komatsu WA70-5

Komatsu WA70-5 Troubleshooting

The Komatsu WA70-5 wheel loader driveline system components: 202 cu.in (3.3L) Komatsu 4D95-LE3 4-cylinder direct injection liquid-cooled diesel engine with a rated power of 60 hp (45 kW), and 2-range hydrostatic transmission. The hydraulic system has a pump with a rated capacity of 13.2 gal/min (50 l/min). The system relief pressure is 3335 psi (230 bar). The Komatsu WA70-5 is equipped with a hydrostatic power steering, hydraulic disc brakes, and 12.5x18 tires. The wheel loader has a max lift height of 123.6" (3140 mm) and breakout force of 8010 lbs (3640 kg). The rated operating capacity is 4435 lbs (2015 kg), and tipping load is 8870 lbs (4030 kg).

Engine Troubleshooting

Engine hard to start or doesn't start
Air in fuel system - Bleed fuel system.
Clogged fuel filter - Change filter element.
Burnt or defective injection nozzle - Clean or replace injection nozzles.
Water in the fuel system - Change fuel and repair fuel system.
Valve clearance is out of adjustment - Adjust valve clearance.
Fuel injection pump is not operating properly - Rebuild or change fuel pump.

Engine starts but stops suddenly
Plugged air filter - Clean or change.
Fuel filter element is dirty - Change or clean the filter element.
Problems with fuel injection pump tightness - Inspect fuel injection pump for leaks.
Defective or clogged fuel injectors - Clean fuel injectors or change it.
Fuel injection pump is not operating properly - Replace or repair injection pump.

Engine stops suddenly during operation
Engine is not warmed up to required temperature - Warm up to required temperature.
Dirty fuel filter - Change filter element.
Air in fuel tank - Bleed fuel tank.
Fuel injection nozzles are damaged or dirty - Test injection nozzles and change if necessary.
Improper setting of fuel injection pump timing - Use the correct fuel injection pump timing adjustment.

Engine shuts off while idling
Wrong adjustment of low idle speed - Correct the settings.
Fuel injection pump is damaged - Repair or replace injection pump.
Damaged or clogged injectors - Replace fuel injectors.
Incorrect valve clearance - Adjust valve clearance.

Diesel engine loses power
Air cleaner is clogged - Service or replace air cleaner.
Faulty or dirty injection nozzles - Check injection nozzles and replace if required.
Insufficient fuel injection pressure - Adjust to correct pressure.
Valve clearance is out of adjustment - Need to adjust valve clearance.
Incorrect low idle speed adjustment - Correct low idle adjustment.
Restricted fuel hoses or lines - Fuel hoses and lines must be clean.
Leaking cylinder head gasket - Replace the gasket as required.
Piston rings are damaged or leaking - Install new piston rings.

Engine is overheated
Low engine coolant - Fill the cooling system and check components for leaks or other faults.
Engine oil insufficient - Fill up the oil to required level.
Clogged radiator fins or leaking radiator cap - Clean radiator or replace cap.
Loose or defective fan belt - Change as required.
Diesel engine is overloaded - Load reducing required.

Low oil pressure
Not enough oil in the engine - Check oil level and add oil as required.
Dirty oil filter - Clean or change engine oil filter.
Incorrect oil viscosity - Drain and refill with oil of correct grade and viscosity.
Main bearing oil clearance is excessive - Change bearings.
Oil pump failure - Install a new pump.

Abnormal engine knocking or noise
Insufficient engine oil - Need to add engine oil.
Engine is not fully warmed up - Warm up the engine.
Timing of fuel injection pump is incorrect - Adjust fuel injection pump as required.
Incorrect low idle speed adjustment - Adjust as required.
Clogged or defective injectors - Clean or replace fuel injectors.
Misaligned or defective connecting rod - Connecting rod needs to be aligned or changed.
Pistons are broken or worn - Install new pistons.

Hydrostatic Transmission Troubleshooting

Hydrostatic transmission makes excessive noise
Low transmission oil level or contaminated oil - Add oil to proper level or pour fresh transmission oil.
Speed control linkage is defective or unadjusted - Adjust or change linkage.
Relief valve is damaged - Replace relief valve as required.
Excessive transmission load - Reduce loading.
Worn or defective parts of the hydrostatic transmission - Check hydrostatic transmission components for defect or damage and change if necessary.

Low power
Transmission oil level is low - Fill the transmission housing with oil.
Relief valve failure - Install a new relief valve.
Speed control linkage is worn or unadjusted - Adjust or install new linkage.

Hot transmission oil
Insufficient transmission fluid - Check and refill the transmission fluid.
Dirty transmission oil filter element - Service or change transmission oil filter.
Cooling components are defective or plugged - Check all cooling components and change or repair if required.
Excessive loading - Reduce the load is required.

Transmission oil leaks
Seals or gaskets are broken - Gaskets or seal replacement required.
Internal transmission housing pressure is too high - Repair or replace damaged components.
Oil drain line is clogged - Clean or change the line.

Hydraulics Troubleshooting

Hydraulic system overheats
Incorrect hydraulic pressure setting - Correct adjustment is required.
Main relief valve is faulty or misadjusted - Replace or set up the relief valve.
Hydraulic fluid contamination - The fluid must be changed.
Hydraulic oil level is low - Fill the hydraulic system with oil.
Worn hydraulic oil pump - Repair or change pump if required.

Boom won't lower or raise
Lift controls are faulty - Change or repair.
Hydraulic pump is broken - Repair or replace pump if necessary.
Hydraulic control valve is faulty - Repair or replace hydraulic valve.
Defective hydraulic cylinder - Change or repair lift cylinder.
Low hydraulic oil level - Need to add oil.

Bucket can't tilt
Defective bucket controls - Repair or change.
Defective hydraulic pump - Replace or repair pump if necessary.
Hydraulic control valve is faulty - Repair or change hydraulic valve.
Faulty hydraulic bucket cylinder - Repair or replace cylinder.
Hydraulic oil is insufficient - Checking hydraulic oil level and add if necessary.

Bucket or lift arm functions slowly
Hydraulic pump is defective - Test the pump flow rate and change pump if required.
Leaking hydraulic cylinder - Change cylinder piston seals.
Insufficient hydraulic oil - Checking hydraulic oil level and add if necessary.
Hydraulic control valve is not set properly or defective - Repair or adjust correctly.
Hydraulic system loosing pressure - Adjust it correctly.

Bucket or boom is moving jerkily
Air leaks in hydraulic system - Bleed air from hydraulic system.
Dirty hydraulic oil filter - Clean or install new filter.
Hydraulic fluid contamination - The fluid must be changed.
Scratched cylinder rod or tube - Change failed component.

Excessive hydraulic pump noise
Not enough oil or hydraulic system leaking - Refill hydraulic oil or repair leaks in system.
Hydraulic filter is dirty - Clean or change the filter.
Suction line clogging - Need to clean the suction line.
Pump is sucking air - Need to bleed air.
Damaged pump components - Rebuild or install new pump.

Electrical Troubleshooting

Battery does not charge
Corroded or loose electrical wire connections - Clean or tighten connections.
Defective electrical terminal connectors - Terminal connectors need to be changed.
Battery dead cell - Replace the battery.
Belt is defective or loose - Change belt or adjust belt tension.

Starter turns slow
Battery capacity is low - Low battery charging, charge as required.
Battery won’t hold charge - Service or replace the battery.
Bad battery terminals or disconnected wiring - Connect wires correctly or change terminals.

Starter is not working
Battery is low or faulty - Change or recharge battery.
Disconnected or incorrectly connected wires - Inspect battery wires and connect correctly.
Battery power is low - Battery is drained, recharge it.
Starter motor is defective - Starter needs to be replaced.

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WHEEL LOADERS SPECIFICATIONS

Wheel Loaders, Skid Steers, and Compact Track Loaders