HEAD 8J0415 - Caterpillar

Table 1
New Part Number Former Part Number Description
500-4893 473-0302 Machine Software Gp Note: The new software is available in the form of a flash file through the Caterpillar Service Information System (SIS). Go to SIS web to make sure that the new flash file part number is still the latest flash file part number. A newer flash file part number may be available. SIS only displays the latest available flash file.The new software has varying improvements that are listed below:Improvements For 793F, 795F AC and 797F
Improvements to the High Brake Pump Command event (EID 527-02) to provide an earlier warning of possible Brake Pump damage.
The event activation time for the High Brake Pump Command has been reduced from 90 seconds to 20 seconds after one good accumulator charge cycle at start-up.Improvements to the Secondary Brake Accumulator event (EID 1653-02) activation threshold.
The event activation pressure for the Secondary Brake Accumulator has been lowered from 12300 kPa (1784 psi) to 6900 kPa (1001 psi).Improvements to the Conflicting Brake Pressure Information event (EID 716-03) activation.
The Conflicting Brake Pressure Event now compares the pressures between the Brake Charging Pump, Service Brake Accumulator, and the Secondary Brake Accumulator pressures during charging.Improvements to inhibit the Secondary Brake Accumulator Pressure Sensor, Service Brake Accumulator Pressure Sensor, and Brake Pump Pressure Sensor diagnostics during engine cranking.The following diagnostics will be inhibited during cranking:
Secondary Brake Accumulator Pressure Sensor - CID 2813-20
Service Brake Accumulator Pressure Sensor - CID 1961-20
Brake Pump Pressure Sensor diagnostics - CID 1962-20Improvement For 797F
Improved Engine Cooling Fan Control:
Reduction in cooling fan speed during Automatic Retarding Control operation in cold ambient air temperature conditions ( −10° C (14° F)) to reduces the risk of over cooling on long retarding runs.
Reduction in cooling fan speed to Zero RPM during torque converter drive operation to reduce parasitic loads on the engine and improve acceleration performance.Improvement For 794
Added support for the Rear Axle Cooling Fan.