• All Manufacturers

  • Bobcat
  • Case
  • Caterpillar
  • Doosan
  • John Deere
  • Kubota
  • JCB
  • Komatsu

  Wheel Loaders

  • Bobcat L28
  • Cat 926M
  • Case 221D
  • John Deere 304H
  • Doosan DL280-7
  • Case 521E
  • Kubota R070
  • John Deere 624J

Home / Wheel Loaders / Komatsu Wheel Loaders / Komatsu WA80-6

Komatsu WA80-6 Troubleshooting

The Komatsu WA80-6 wheel loader is powered by Komatsu S4D95LWE-5 4-cylinder turbocharged diesel engine with a rated power of 67.1 hp (50 kW) at 2270 rpm. The Komatsu WA80-6 is equipped with a two-range hydrostatic transmission, power steering system, hydraulic wet disc brakes, and 405/70R18 standard tires. The hydraulic system has a pump with fluid flow rate of 16.9 gpm (64 lpm). The hydraulic pressure is 3915 psi (270 bar). The wheel loader has a rated operating capacity of 4740 lbs (2155 kg) and tipping load of 9480 lbs (4310 kg). The max lift height is 126.4 inches (3210 mm) to hinge pin, and boom breakout force is 12715 lbs (5780 kg).

Engine Troubleshooting

Engine starts up hard or will not start
Air in the fuel pipes - Bleed the fuel pipes.
Fuel filter element is clogged - Filter maintenance required.
Burnt or clogged injection nozzle - Check and replace nozzles if required.
Water in the fuel system - Change fuel and repair fuel system.
Excessive valve clearance - Adjust to proper valve clearance.
Faulty fuel injection pump - Repair or replace injection pump.

Engine starts but stops suddenly
Air filter is clogged - Clean or change.
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 - Change or clean fuel injectors.
Fuel injection pump is not operating properly - Rebuild or install a new injection pump.

Engine stops suddenly during operation
Coolant temperature is low - Normalize the temperature by warming up the engine.
Fuel filter is plugged - Replace the filter element.
Air in the fuel lines - Bleed the fuel lines.
Dirty or damaged injection nozzles - Check and replace nozzles if required.
Fuel injection pump timing is wrong - Use the correct fuel injection pump timing adjustment.

Engine stalls at low idle speed
Wrong adjustment of low idle speed - Correct low idle settings.
Damaged fuel injection pump - Install a new fuel pump or repair.
Fuel injector fault - Inspect fuel injectors and change as required.
Excessive valve clearance - Check and adjust.

Low engine power
Air filter is dirty - Replace or clean air filter element.
Clogged or defective injection nozzles - Change fuel injection nozzles.
Incorrect fuel injection pressure - Adjust to proper pressure.
The valve clearance is incorrect - Check and adjust as required.
Too low idle RPM - Adjust low idle speed.
Fuel hoses or lines clogging - Clean fuel hoses and lines.
Defective cylinder head gasket - Change cylinder head gasket.
Leaking or defective piston rings - Change piston rings.

Engine overheating
Lack of engine coolant - Top up coolant fluid and check system for leaks.
Engine oil insufficient - Checking oil level and add if necessary.
Radiator fins are clogged or radiator cap is faulty - Clean radiator or change cap.
Loose or damaged fan belt - Replace the fan belt.
Engine is under excessive load - Load reducing required.

Insufficient oil pressure
Oil level is insufficient - Checking oil level and add if necessary.
Dirty oil filter - Change or clean engine oil filter element.
Different type of engine oil - Use correct viscosity oil.
Incorrect oil clearance in crankshaft bearing - Bearings need to be reinstalled.
Oil pump malfunction - Replace as required.

Engine noises or knocks
Low engine oil level - Check oil level and add oil as required.
Coolant temperature is low - Warm up to required temperature.
Wrong setting of fuel injection pump timing - Adjust fuel injection pump as required.
Low idle speed set incorrectly - Need to adjust idle speed.
Fuel injectors are faulty or clogged - Replace fuel injectors.
Connecting rod is not aligned or worn - Connecting rod needs to be replaced or aligned.
Pistons are worn or broken - Have pistons replaced.

Hydrostatic Transmission Troubleshooting

HST transmission makes excessive noise
Dirty transmission fluid or insufficient fluid level - Fill to required level or change the fluid.
Worn or unadjusted speed control linkage - Adjust or replace linkage.
Relief valve is damaged - Replace valve as required.
Transmission overloaded - Reduce the load is required.
Worn or defective transmission components - Check hydrostatic transmission components for defect or damage and change if necessary.

Loss of power
Insufficient transmission fluid - Need to add transmission fluid.
Relief valve malfunction - Replace relief valve.
Bent or unadjusted speed control pedal linkage - Adjust or install new linkage.

Transmission fluid overheats
Lack of transmission fluid - Checking transmission fluid level and add if necessary.
Transmission oil filter element clogging - Clean or change transmission oil filter.
Plugged or defective cooling components - Inspect all cooling components and service or change if necessary.
Excessive transmission load - Reduce transmission load.

Transmission fluid leaks
Damaged seals or gaskets - Install new components.
High internal transmission case pressure - Check transmission parts for damage or wear and replace if required.
Clogged oil drain line - Clean or replace drain line.

Hydraulics Troubleshooting

Hydraulic system overheated
Hydraulic pressure is not adjusted correctly - Set pressure correctly.
Main relief valve failure or improper setting - Adjust or change relief valve.
Dirty hydraulic fluid - Fill up with fresh hydraulic fluid.
Hydraulic oil level is insufficient - Fill the hydraulic system with oil.
Defective hydraulic pump - Repair or change pump if required.

Lift arm fails to drop or lift
Lift controls malfunction - Change or repair.
Defective hydraulic pump - Repair or install new hydraulic pump.
Hydraulic control valve is faulty - Change or repair hydraulic valve.
Hydraulic cylinder is broken - Replace or repair boom cylinder.
Low hydraulic oil level - Fill the system to proper hydraulic oil level.

Bucket does not tilt
Faulty bucket tilt controls - Repair or change.
Damaged hydraulic oil pump - Replace or repair pump if necessary.
Damaged hydraulic control valve - Change or repair hydraulic valve.
Bucket cylinder malfunction - Repair or install a new cylinder.
Low hydraulic fluid level - Fill the system to proper hydraulic fluid level.

Boom or bucket is moving slowly
Faulty hydraulic oil pump - Test the pump flow rate and install new pump if required.
Hydraulic cylinder leaking - Replace cylinder piston seals.
Hydraulic fluid level low - Fill up the hydraulic fluid.
Hydraulic control valve is unadjusted or worn - Set properly or repair.
Low hydraulic pressure - Correct adjustment is required.

Bucket or boom movements are jerky
Air trapped in hydraulic system - Bleed air from system.
Dirty hydraulic oil filter - Change or clean oil filter.
Dirty hydraulic fluid - The fluid must be changed.
Scratched cylinder rod or tube - Change worn component.

Hydraulic pump is noisy
Hydraulic system leaking or not enough oil - Correct hydraulic leaks or top up oil as needed.
Hydraulic filter is clogged - Replace or clean the filter.
Suction line clogging - Suction line must be serviced.
Air trapped in hydraulic pump - Need to bleed air.
Pump parts are faulty - Replace or rebuild the pump.

Electrical Troubleshooting

Battery is not charging
Corroded or loose wire connections - Service or tighten connections.
Defective battery terminal clamps - Change terminal clamps.
Defective battery - Change the battery.
Loose or damaged belt - Change belt or adjust belt tension.

Starter turns slowly
Battery voltage is low - Battery needs to be recharged.
Battery drains quickly - Battery needs to be serviced or replaced.
Disconnected cables or faulty battery terminals - Check wire connections and change or service terminals.

Starter is not cranking
Battery is discharged or worn - Recharge or replace battery.
Wire harness is disconnected or incorrectly connected - Check wire harness and connect as required.
Low battery power - Charge the battery.
Starter motor failure - Starter needs to be replaced.

____________________________________________________________________________________

WHEEL LOADERS SPECIFICATIONS

Wheel Loaders, Skid Steers, and Compact Track Loaders