Automatic Retarding Control Recommendations For Preventing Elevated Brake Oil Temperatures On Certain Articulated Trucks {1901, 3030, 3120, 3142, 3168, 425R, 7490} Caterpillar

Articulated Truck

735C (S/N: LFJ1-UP; TFJ1-UP)

740 EJECTOR (S/N: 3F71-UP; 3T71-UP)

740 GC (S/N: 3F81-UP; 3T81-UP)

740C EJECTOR (S/N: LFN1-UP; TFN1-UP)

745 (S/N: 3F61-UP; 3T61-UP)

745C (S/N: LFK1-UP; TFK1-UP)

Automatic Retarding Control (ARC) Grade Mode is configurable in Cat Electronic Technician (Cat ET) Service Tool between "Short" and "Long" modes. Use the following recommendations to prevent elevated brake oil temperatures on your machine.

Note: The ARC Grade Mode defaults to ARC Short Grade Mode in Cat ET.

Description

ARC Long Grade Mode targets a retarding level that can run continuously within each system’s cooling capability.

ARC Short Grade Mode is a performance mode that targets a retarding level that allows running above the normal ARC level, until the brakes get warm:

• ARC Short Grade Mode allows the truck to remain 1 gear above continuous capability for grades that have a continuous capability gear of 5 or greater

• ARC Short Grade Mode allows the truck to remain 2 gears above continuous capability for grades that have a continuous capability gear of 4 or lower

Application Recommendations

ARC Long Grade Mode should be used in the following conditions:

• Grade lengths are longer than specified in the table above , OR

• Payload weights are more than rated capacity, OR

• Any sites where brake dampers have been replaced or have discolored brake oil

ARC Short Grade Mode use is appropriate in the following conditions:

• Operating on downhill grades not exceeding distances specified in the table above, and

• Payload weights are at or below operating payload

Changing ARC Grade Mode Configuration in Cat ET

Illustration 1	g06381352
Changing Cat ET "Configuration" for ARC Grade Mode

1. Select the Transmission ECM in Cat ET

2. Select "Machine Configuration"

3. Select "ARC Grade Mode"
   Show/hide table

   Illustration 2	g06381356
   Screen options

4. Select "Change" option
   Show/hide table

   Illustration 3	g06381357
   Change Parameter Value window

5. Change the "New Value" from "Short" to "Long" in the drop-down menu to switch the retarding control from ARC Short Grade Mode to ARC Long Grade Mode

6. Select "OK" to close the window.