Scrapers, I love 'em!
Open bowl scrapers often require a push-cat, i.e. they
require a tracked dozer, or similar, to push from behind to cut hard
materials, and thus load the scraper.
Tandem scrapers have two engines, i.e. separate tractor and
scraper engines. This configuration increases traction in steep or
slippery areas. These still require a push-cat to load properly
unless they are working with materials that are soft or loose,
materials such as coal (with a coal bowl), or when grooming
fill material for new road construction.
Some tandem scrapers have a push-pull attachment. This
arrangement concentrates the combined horsepower of two such machines
onto one cutting edge. The push-pull attachment allows two
individual scrapers to act as a self-loading system, typically loading
both machines in less than a minute, one after the other.
Elevating scrapers are self-loading. These are typically open
bowl scrapers with a looping elevator mechanism that feeds material
into the bowl, and conditions it as it works. Augers are also
self-loading, but are seen less frequently.
Caterpillar 613C elevating scraper
Burago die-cast Caterpillar 615 elevating scraper model, $84.95
Caterpillar 615C elevating scraper
Caterpillar 621 open bowl scraper
Caterpillar 627F tandem open bowl scraper
Caterpillar 631E open bowl scraper
Caterpillar 633 elevating scraper
Caterpillar 633D elevating scraper
Caterpillar 637E tandem push-pull scraper
Here's a Caterpillar 651 open bowl scraper I noticed at an equipment
auction in Salt Lake City, May, 1990.
Terex S23 elevating scraper
Terex TS24 tandem push-pull scraper
CATERPILLAR SCRAPER DATA
Model - 613C
Configuration - Elevating
Engine - 175HP
Capacity - 9yds struck, 11yds heaped
Length - 33ft
Payload - 26,400lbs
Max Gross Weight - 60,050lbs
Model - 615C
Configuration - Elevating
Engine - 265HP
Capacity - 14yds struck, 17yds heaped
Length - 38ft
Payload - 41,000lbs
Max Gross Weight - 97,250lbs
Model - 621G
Configuration - Open bowl
Engine - 330HP
Capacity - 16yds struck, 22yds heaped
Length - 43ft
Payload - 52,800lbs
Max Gross Weight - 124,590lbs
Model - 623G
Configuration - Elevating
Engine - 365HP
Capacity - 18yds struck, 23yds heaped
Length - 43ft
Payload - 55,000lbs
Max Gross Weight - 136,250lbs
Model - 627G
Configuration - Tandem engine, push pull
Engine - 330HP/225HP
Capacity - 16yds struck, 22yds heaped
Length - 43ft
Payload - 52,80lbs
Max Gross Weight - 139,190lbs
Model - 631G
Configuration - Open bowl
Engine - 450HP
Capacity - 24yds struck, 34yds heaped
Length - 48ft
Payload - 82,200lbs
Max Gross Weight - 184,660lbs
Model - 637G
Configuration - Tandem engine, push-pull
Engine - 450HP/249HP
Capacity - 24yds struck, 34yds heaped
Length - 48ft
Payload - 82,260lbs
Max Gross Weight - 200,284lbs
Model - 651G
Configuration - Open bowl
Engine - 550HP
Capacity - 32yds struck, 44yds heaped
Length - 53ft
Payload - 104,000lbs
Max Gross Weight - 238,760lbs
Model - 657G
Configuration - Tandem engine, push-pull
Engine - 950HP/400HP
Capacity - 32yds struck, 44yds heaped
Length - 53ft
Payload - 104,000lbs
Max Gross Weight - 256,290lbs