Utility digger derricks are usually classified by their capacity rating with the booms fully retracted and fully elevated. This is not a practical working position. A more meaningful comparison of useful lifting capacities can be made when the rating classification is the load which can be lifted by the digger derrick lift cylinder at a ten foot load radius. Lifting capacities at lower boom angles are also important for digger derrick applications.
Standardization of Digger Derrick Capacity Ratings
Sae Technical Papers
SAE International Congress and Exposition ; 1983
1983-02-01
Conference paper
English
Standardization of digger derrick capacity ratings
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