A 300 HP crawler tractor is pulling a wagon of 25 cu yd capacity equipped with high pressure tires. The weights of the crawler tractor and the empty wagon are 25 tons and 15 tons respectively. The haul road is well maintained and compacted earth. Select highest figure in range for rolling resistance. The coefficient of traction is 0.75. Half of the weight of the crawler tractor and half of the weight of the loaded wagon need to be considered in the slippage check. No penetration occurs as the surface is hard enough. The average temperature and barometric pressure at the site location are 30oC and 56.00 cm of Hg respectively. The drawbarpull produced by the tractor at standard conditions is given in the machine’s manual as 15,000 kg in first gear. What is the gradability of the tractor/wagon combination if the wagon is loaded with dry earth? Take a gradability safety factor of 85%
A 300 HP crawler tractor is pulling a wagon of 25 cu yd capacity equipped with high
pressure tires. The weights of the crawler tractor and the empty wagon are 25 tons
and 15 tons respectively. The haul road is well maintained and compacted earth.
Select highest figure in range for rolling resistance. The coefficient of traction is
0.75. Half of the weight of the crawler tractor and half of the weight of the loaded
wagon need to be considered in the slippage check. No penetration occurs as the
surface is hard enough. The average temperature and barometric pressure at the
site location are 30oC and 56.00 cm of Hg respectively. The drawbarpull produced
by the tractor at standard conditions is given in the machine’s manual as 15,000 kg
in first gear. What is the gradability of the tractor/wagon combination if the wagon is
loaded with dry earth? Take a gradability safety factor of 85%.
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