The Caterpillar AD55B articulated truck for underground mining replaces the AD55 with more power and enhanced braking and retarding for faster speed on grade.
The 55-metric-ton-capacity truck also features a Cat C27 ACERT engine that produces 805 gross horsepower.
Automatic Retarder control (ARC) also contributes to high productivity, as it electronically controls retarding on grade to maintain optimum engine rpm and oil cooling for faster downhill hauls.
ARC protects the engine from overspeeding, improves fuel efficiency, provides better control of the truck, increases productivity and frees the operator to focus on other tasks.
The Cat oil-cooled braking system combines the service, secondary, parking brake and retarding functions in the same system.