Excavator/Loader/Mining Truck You are in a flood control channel and want to sco
ID: 1732698 • Letter: E
Question
Excavator/Loader/Mining Truck You are in a flood control channel and want to scoop out dirt left from a recent rain event. You have available three excavators - a 345D, 365CL and 385CL. Their lease/operating costs are $225/hr, S325/hr, and S380/hr. You have.to scoop out 12,000 cu. yds. using the maximum rated bucket capacity for each. Assuming.that each piece of equipment has adequate front and side reach capacity, which piece of equipment would you use? 1. You are using a 365CL excavator. What stick size will allow you to perform a 30-foot front reach of 36,500 lbs.? At its maximum boom size, what is its maximum front and side reach capacity? 2. You are using a 775F Dual Slope mining truck with a grade resistance of 6% and a haul road which is characterized as a dirt roadway with no water and 1" tire penetration. The mining truck can maneuver and spread in 45 seconds. The haul road is 1600 meters away. With a 54-minute job efficiency, what is the hourly production of the 775F? The soil density is 2,600 #/cu. yd. 3. 4. What is the % reduction in hourly production rate if you were to use a 770 for problem #3 5 For problem number 3, if you were matching up an excavator with the 775F, how many 775F trucks would you need if the excavator had a 45 sec cycle with a 10-cubic yard bucket load per cycle? What if the excavator had only a 4-cubic yard bucket load per cycle, how many 775F's would you need then?Explanation / Answer
Maximum bucket capacity of 345 D- 3.5 m3
Maximum bucket capacity of 365 CL- 4.6 m3
Maximum bucket capacity of 385 D- 5.4 m3
The work needs to be carried out in flood control channel. Maximum bucket capacity excavator to be choosen to complete the work within short time.
Hence Excavator 385 D is choosen.
From catalogue of 365 CL no load and boom stick combination available to permorm a front reach of 30 foot and laod of 36500 pounds.
From caralogue at its boom size 0f 7800 mm & stick size of 4670 mm
at ground line
maximum front reach and side reach in metres= 40 feet
Front reach capacity= 20,650 lbs
Side reach capacity=13,100 lbs
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