Answer Happy

Posted: **Thu May 05, 2022 11:35 am**

: Cat 631e Scrapers With Retarders Are Used And Able To Haul Full Heaped Loads Of Borrow To An Embankment A Push Tractor 1 (1018.47 KiB) Viewed 24 times

: Cat 631e Scrapers With Retarders Are Used And Able To Haul Full Heaped Loads Of Borrow To An Embankment A Push Tractor 2 (1.04 MiB) Viewed 24 times

Cat 631E Scrapers with retarders are used and able to haul full-heaped loads of borrow to an embankment. A push tractor is used to facilitate scraper loading. The road to the fill is 1,600 feet long at 8% grade followed by another 1,500 feet run at 5% grade. The road has an RR of 80 lbs. per ton. (Assume a pusher contact time Lt of .85 minutes, Dump time of .37 minutes, and turn times of .21 minutes at the fill and .30 minutes at the pit) Use the specs and performance charts in chapter 5/chapter 8 of the text to answer the following: (show calculations)
a. What is the scraper cycle time? (Acceleration/Deceleration speeds shall be at 50% of the speed over the first and last 200' for road) (9pts) b. Using a 52-minute hour, how many scraper cycles per hour? (5 pts) c. How many LCY per hour is hauled per scraper? (5 pts) d. What is the production per hour if the pusher controls? (5 pts)