This SAE Recommended Practice applies to mobile excavators, as defined in SAE J/ISO 6165, Earthmoving Machines~Basic Types~Vocabulary, and backhoes as defined in SAE J 326, Nomenclature Hydraulic Backhoes.

This document provides a set of uniform hand signals for use by a signalman to direct an operator in the movement of the load or the working equipment or travel of a mobile excavator or backhoe.