Komatsu 830E-AC Shop Manual page 970

PROBLEM: Condenser Malfunction or System Overcharge
Indications:
Low Side High
High Side High
Discharge air may be warm.
High pressure hoses and lines are very hot.
Possible Causes
- Lack of air flow through the condenser fins
N4-44
Suggested Corrective Actions
Repair Procedure: Check the engine cooling
system components, fan and drive belt, fan clutch
operation, and the radiator shutter. Inspect
condenser for dirt, bugs, or other debris, and
clean if necessary. Be sure the condenser
is securely mounted and there is adequate
clearance (about 38 mm) between it and
the radiator. Check the radiator pressure cap and
cooling system, including the fan, fan clutch, drive
belts and radiator shutter assembly. Replace any
defective parts and then recheck A/C system
operation, gauge readings, and performance.
If the problem continues, the system may be over-
charged. Recover the system refrigerant. Use a
scale to recharge the system using the correct
amount. Recheck A/C system operation, gauge
readings and performance. If the gauge readings
do not change, all of the refrigerant should be
recovered and the system flushed. The condenser
may be partially blocked -replace condenser. The
receiver-drier must also be replaced. Evacuate the
system, recharge, and check operation and
performance.
Operator Comfort 10/06 N04031