THEORY OF OPERATION: INTRODUCTION
The Military 621G Scraper is an earth-moving machine classified as scraper. This machine is used to cut, load,
transport and grade material through forward motion of the machine. The Military 621G Scraper has two distinct
main components: a tractor and a scraper.
The tractor consists of:
· Hydraulic system
· Two drive wheels
· Operator station
The scraper consists of:
· Two non drive wheels
· Apron - blade used for scraping
· Bowl - collects and holds material
· Ejector - removes grade material from bowl
A 15.2L, six-cylinder, turbocharged diesel engine powers the Military 621G Scraper. The semi-automatic
transmission has eight forward speeds and one reverse speed. The Military 621G Scraper is equipped with an air
brake system operating a drum brake at each of the four wheels. The Military 621G Scraper is equipped with three
electronic control modules which control and monitor the major systems of the machine.
Refer to Theory of Operation (WP 0004) for information about the major systems on the Military 621G Scraper.
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