MACHINE OPERATIONS AND CONTROLS 3.3.12 WORK POSSIBLE USING COMPACT HYDRAULIC EXCAVATOR In addition to the following, it is possible to further increase the range of applications by using various attachments. BACKHOE WORK This is suitable for excavating places lower than the machine. When work equipment is in condition shown in diagram on right, each cylinders maximum pushing exacavtion force is ob- tained when the center line of arm cylinder and arm foot pin and the bucket cylinder and link are at 90°, the push-out dig- ging force of each cylinder is the maximum. Make the optimum use of this angle during digging operations to increase the operating efficiency.
The range for excavating with the arm is from a 45° angle away from the machine to a 30° angle toward the machine. There may be some differences depending on the digging depth, not try to keep within the above range rather than oper- ating to the end of the cylinder stroke. DITCHING WORK Ditching work can be performed efficiently by attaching a bucket which matches the digging operation and then setting the tracks parallel to the line of the ditch to be excavated. To excavate a wide ditch, first dig both sides and then finally remove the center portion.
LOADING WORK In places where the swing angle is small, work efficiency can be enhanced by locating the dump truck in a place easily visi- ble to the operator. Loading dump trucks is easier and the loading capacity is greater if the hydraulic excavator loads from the rear of the dump truck rather than from the side. 125