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Compact Excavator
The compact hydraulic
excavator can be a tracked or wheeled vehicle with an approximate
operating weight of 13,300 pounds. Normally, it includes a standard
backfill blade and features an independent boom swing. The compact
hydraulic excavator is also known as a mini excavator.
A compact hydraulic excavator is different from other types of heavy
machinery in the sense that all movement and functions of the
machine are accomplished through the transfer of hydraulic fluid.
The work group and blade are activated by hydraulic fluid acting
upon hydraulic cylinders. The rotation and travel functions are also
activated by hydraulic fluid powering hydraulic motors. Most types
of compact hydraulic excavators have three assemblies - house,
undercarriage, and the work group. The house structure contains the
compartment for the operator, engine compartment, hydraulic pump and
also the distribution components. The house structure is attached to
the top of the undercarriage via swing bearing. Along with the work
group, the house is able to rotate upon the undercarriage without
limit due to a hydraulic distribution valve that supplies oil to the
undercarriage components.
The undercarriage of compact excavators consists of rubber or steel
tracks, drive sprockets, rollers, idlers, and associated components
and structures. The undercarriage is also home to the house
structure and the work group.
The work group consists of the boom, dipper or arm, and attachment.
It is connected to the front of the house structure via a swinging
frame that allows the work group to be hydraulically pivoted left or
right in order to achieve offset digging for trenching parallel with
the tracks. The purpose of the boom swing is for offset digging
around obstacles or along foundations, walls, and forms. Another use
is for cycling in areas that are too narrow for cab rotation.
Another major advantage of the compact excavator is the independent
boom swing.
The backfill blade on compact excavators are used for grading,
leveling, backfilling, trenching, and general dozer work. The
blade can also be used to increase the dumping height and digging
depth depending on it's position in relation to the workgroup. The
most common place you'll find compact excavators is in residential
dwellings. When digging phone
lines or other things, these pieces of equipment are very common for
getting between houses. Due to their small size, they can fit almost
anywhere.
Over the years, the capabilities for compact excavators have
expanded far beyond the tasks of excavation. With hydraulic powered
attachments such as breakers, clamps, compactors and augers, the
compact excavator is used with many other applications and serves as
an effective attachment tool as well. Serving many purposes, the
compact excavator is a great addition to any job that requires the
use of machinery.
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