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This SAE Standard provides a uniform method for determining rated and struck capacity for buckets used on excavators, mini-excavators, and backhoes as defined in SAE J1057 and equipped with hoe attachment. Calculations are based on the inside physical dimensions of the bucket only, without use of optional side cutters, spill guards, teeth, or other accessories and without regard to bucket action provided by any specific machine. This document does not cover shovel, clam, or dragline buckets described in SAE J67 or loader buckets described in SAE J742.

This standard applies to hoe buckets on all excavators with a hoe attachment.

This Recommended Practice applies to mobile hydraulic excavators which are either crawler or wheel mounted, with or without outrigger members. (A mobile hydraulic excavator is defined as “a self-propelled machine with an upper structure capable of continuous rotation and which digs, elevates, swings, and dumps material by action of the boom and arm or telescoping boom with bucket.”)

This standard specifies a procedure for approximating the volume of materials contained in the grapple of bucket linkage operated grapples mounted to excavators. The volume ratings are based on the inside dimensions of the grapple and representative volumes extending beyond the grapple. The method employs the technique of dividing the complex shape of the material in the grapple into simple geometric forms to allow volume calculations of different grapple configurations. The rating method is intended to provide a consistent means of comparing grapple capacities. It is not intended to define actual capacities that might be observed in any specific application.