LOWER MACHINE FRONT: This is the end of the lower op-
The two variable displacement pumps provide power to the
posite the propel motors.
crawler motors. Both crawler motors drive their respective
sprocket to propel the machine. Crawler speed and direc-
UPPER MACHINE FRONT: The front of the upper is the end
tion (forward, reverse, left or right) are accomplished
having the boom.
through the propel controller in the operator's cab.
LOWER MACHINE REAR: This is the end of the lower which
has the propel motors mounted.
Certain terms are frequently used in this manual. For bet-
ter understanding, several are defined below and illus-
UPPER MACHINE REAR: The rear of the upper is the coun-
LOWER: The portion of the machine on which the upper is
RIGHT SIDE: The right side of the machine is to the oper-
ator's right when he is seated at his controls and is facing
CARBODY: The traveling base upon which the upper and
side frames are mounted.
LEFT SIDE: The left side of the machine is to the operator's
SIDE FRAME: A frame attached to the carbody which sup-
left when he is seated at his controls and is facing forward.
ports the crawler track and crawler motors.
ATTACHMENT: An alternate designation for front end
UPPER: The upper is defined as the revolving portion of the
equipment. In the case of the lift crane, it includes the
crane. It is sometimes referred to as the superstructure.
gantry, boom, backstops, and jib.
REVOLVING FRAME: The revolving frame is the deck of the
upper on which all upper machinery is mounted.
HOIST: The process of lifting the load.