A fully loaded CAT 621K scraper is operated in fifth gear at its full rated rpm. Ambient air temperature is 60°F and the altitude is approximately sea level. The scraper is climbing a uniform 4% slope with a rolling resistance of 70 lb/ton and the pneumatic-tire scraper
A fully loaded CAT 621K scraper is operated in fifth gear at its full rated rpm. Ambient air temperature is 60°F and the altitude is approximately sea level. The scraper is climbing a uniform 4% slope with a rolling resistance of 70 lb/ton and the pneumatic-tire scraper bowl is fully loaded with fill material.
a. What is the operating weight of the empty scraper in pounds?
b. What is the rated load in pounds for this scraper?
c. What portion, in pounds and percent, of the fully loaded weight is carried by the front axle?
d. What portion, in pounds and percent of the fully loaded weight is carried by the rear axle (the axle of the bowl)?
e. What is the speed of the scraper in mph when operated in fifth gear (forward)?
f. At what net horsepower does the manufacturer rate the tractive effort of the scraper for the environmental conditions described and operating in fifth gear?
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