(ON SLIDE #189) 621B SCRAPER (55 MIN) 12. (ON SLIDE #190) NOMENCLATURE a. (1) The 621B is an open bowl, pneumatic tired, two axle, single diesel powered, articulated frame-steer scraper. The operating weight is 66,590 lbs. empty. Manufactured by Caterpillar Tractor Company. (ON SLIDE #191) (2) The tractor serves as the power unit for the scraper and it is also the operator's control center for both the tractor and scraper. It is equipped with a six cylinder diesel engine. (ON SLIDE #192,193,194,195) (3) All scrapers have four main components: (a) Power unit- provides the pulling/pushing power. (b) Bowl - It is the load carrying component of the scraper. (c) Apron - It is the front wall of the bowl. The apron holds the fill in the bowl or allows discharge of the fill. (d) Ejector - It is the rear wall of the bowl. It moves forward to eject the material from the bowl and it moves to the rear to allow for loading. (ON SLIDE #196) CAPABILITIES b. (1) Scrapers are capable of carrying two of loads. (ON SLIDE #197,198) (a) Struck Load - A struck load is when the height of the load is even with the sides of the scraper. A struck load consists of 14 cu yds of material and is used on long hauls.
(ON SLIDE #189) 12. 621B SCRAPER (55 MIN) (ON SLIDE #190) a. NOMENCLATURE (1) The 621B is an open bowl, pneumatic tired, two axle, single diesel powered, articulated frame-steer scraper. The operating weight is 66,590 lbs. empty. Manufactured by Caterpillar Tractor Company. (ON SLIDE #191) (2) The tractor serves as the power unit for the scraper and it is also the operator's control center for both the tractor and scraper. It is equipped with a six cylinder diesel engine. (ON SLIDE #192,193,194,195) (3) All scrapers have four main components: (a) Power unit- provides the pulling/pushing power. (b) Bowl - It is the load carrying component of the scraper. (c) Apron - It is the front wall of the bowl. The apron holds the fill in the bowl or allows discharge of the fill. (d) Ejector - It is the rear wall of the bowl. It moves forward to eject the material from the bowl and it moves to the rear to allow for loading. (ON SLIDE #196) b. CAPABILITIES (1) Scrapers are capable of carrying two of loads. (ON SLIDE #197,198) (a) Struck Load - A struck load is when the height of the load is even with the sides of the scraper. A struck load consists of 14 cu yds of material and is used on long hauls.
Eng%20Equip%20Licensing%20completed%20Detailed%20Outline.docx