A wheel tractor-scraper is operating on a level grade. Assume no power derating is required for equipment condition, altitude, and temperature. Use equipment data from Fig. 6.7. a. Disregarding traction limitations, what is the maximum value of rolling resistance (in lb/ton) over which the fully loaded unit can maintain a speed of 10 mph? b. What minimum value of coefficient of traction between the tractor wheels and the traveling surface is needed to satisfy the requirements of part a? For the fully loaded condition, 50% of the weight is distributed to the drive axle. Operating weight of the empty scraper is 89,973.0 lb.
A wheel tractor-scraper is operating on a level grade. Assume no power derating is required for equipment condition, altitude, and temperature.
Use equipment data from Fig. 6.7.
a. Disregarding traction limitations, what is the maximum value of rolling resistance (in lb/ton) over which the fully loaded unit can maintain a speed of 10 mph?
b. What minimum value of coefficient of traction between the tractor wheels and the traveling surface is needed to satisfy the requirements of part a? For the fully loaded condition, 50% of the weight is distributed to the drive axle. Operating weight of the empty scraper is 89,973.0 lb.
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