If a tractor with 23-hp, a max speed of 3.6 mph in 1st gear and an effieiciency of 92% is operated operated down a 4% slope and the rolling resistance is 80 lb/ton, what is the maximum external pull in each of the 4 gears.
1st gear = 3.6 mph
2nd gear = 6.40 mph
3rd gear = 11.2 mph
4th gear = 19.3 mph