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komatsu wa115-3 wheel loader repair TROUBLESHOOTING GUIDE

Checks prior to trouble shooting:

  • Check belt tension
  • Check condenser
  • Check condenser blower, rotation direction right
  • Compressor switches on and off
  • Compressor clutch OK
  • Function of air vents OK
  • Coolant level OK (inspection glass)
  • Condensation drain away
  • Air temperature OK

Fault 1. Low pressure too or  high High pressure too high

Cause
Remedy
  • System too full
  • Condenser is dirty or blocked
  • Blower faulty or wrong rotational direc
  • Check filling level
  • Clean condenser or replace
  • Repair blower or replace

Fault 2.  Low pressure too or  high High pressure too high

Cause
Remedy
  • Dryer blockes
  • Faulty expansion valve
  • Compressor faulty
  • Replace dryer
  • Replace expansion valve
  • Replace compressor

Fault 3.  Low and high pressure the same

Cause
Remedy
  • Compressor faulty
  • Check drive belt – belt pulley – magnetic clutch, if all correct, proceed as for “Compressor does not switch on”

Fault 4. Low pressure too low or High pressure normal

Cause
Remedy
  • Faulty expansion valve
  • Dirty or blockes vaporizer
  • Replace expansion valve
  • Clean or replace vaporizer

Fault 5. Low pressure too low or High pressure too low

Cause
Remedy
  • Expansion valve faulty
  • Not enough coolant
  • Insufficient cooling effect only for short time; water in system, expansion valve iced up as a result
  • Dryer or expansion valve partially blocked
  • Vaporizer iced up
  • Thermoswitch not working
  • Replace expansion valve
  • Refill air conditioning system
  • Evacuate system, replace dryer
  • Replace dryer or expansion valve
  • Check the ON and OFF times of the compressor
  • Adjust or replace the thermoswitch

Fault 6. Compressor switches on and off at speed

Cause
Remedy
  • Loose contact in the electric system
  • Coolant pressure too high
  • Check electrical system (air conditioner switch, thermostat)
  • Check air conditioning system pressure and refill if necessary

Fault 7. Compressor constantly running as well 

Cause
Remedy
  • Thermostat not working
  • Check whether sensor lead has been pushed into the vaporizer correctly
  • Check wether the sensor lead is okay
  • Adjust or replace thermostat

Fault 8. Compressor does not switch on

Cause
Remedy
  • Not enough coolant in system
  • Air conditioning system power supply interrupted
  • Check air conditioning system pressure and refill if necessary
  • Check electrical system

Fault 9. Condenser fan not working

Cause
Remedy
  • Fault in the electrical system
  • Fan faulty
  • Check electrical system
  • Repair fan or replace

Fault 10. System leaking

Cause
Remedy
  • O-ring connection leaking
  • Compressor shaft seal leaking
  • Hose/line leaking
  • Check pipe and line connections
  • Check pipes and lines
  • Check whether magnetic clutch belt pulley is oily

Related Files:

Related files:

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