A contractor is planning to use a crawler tractor with power shift transmission to push 1,500 LCY. The tractor must haul the loose material up a 12% slope where it will be stockpiled for later removal.

1. A contractor is planning to use a crawler tractor with power shift transmission to push 1,500 LCY. The tractor must haul the loose material up a 12% slope where it will be stockpiled for later removal. The contractor has measured the tractor blade load measurement: the pile length 12.6 ft, the pile width 8.1 ft, and the pile height 4 ft. The tractor weighs 44,400 pounds, and the coefficient of traction is estimated to be 0.7. The average haul distance is estimated to be 300 ft. The job efficiency is 50 minutes per hour. Performance characteristics of the tractor are shown in the lecture slides. (Note: 1 mi/hr = 88 ft/min).

1) What is the estimated productivity of the tractor? (First gear for dozing; Third gear for return.)

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2) Estimate the total hours to complete the work.

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3) Determine if the tractor can perform the work in the given condition above.

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