THEORY OF OPERATION
The D7R Series II Dozer consists of the following functional systems: engine, powertrain, brakes, electrical, steer-
This work package explains how the systems and components of the machine work together. A functional descrip-
tion is provided for each major component and system.
The D7R Dozer is an all-purpose, medium-sized, self-propelled, full-tracked crawler used for cutting, moving, and
dozing various types of granular material (dirt, stone, sand, etc.). Power is provided by a Caterpillar in-line, six-
cylinder, direct injected, diesel engine. Hydraulically operated implements allow blade positioning for dozing
material in a forward direction. A hydraulically operated ripper allows loosening of compacted material prior to
dozing. A hydraulically operated winch provides pulling capability. The machine has a sound-suppressing Falling
Object Protective Structure (FOPS) cab with insulation, heater, air conditioning, and windows, which allow for all-
weather operation. A Rollover Protective Structure (ROPS) is mounted on the chassis frame and protects the
operator in the event of a rollover.