oldhousehugger
Member
I'm working on an old John Deere 8340 4X4 articulated tractor. I have to replace the cratered front axle with a better one from a donor machine. I got the newer axle and decided to replace the rear seal at the pinion shaft. The keeper nut at that location requires being torqued to 440 ftlbs and then retorqued to 350 ftlbs. The size of the nut is 3-1/2 inches. I cut a wrench out of steel plate and welded a 3/4 inch socket into the plate 12 inches away from the center of the 3-1/2 hexagonal hole. I only have 1/2 inch drive torque wrenches. I did purchase a 4x1 torque multiplier off Ebay which works great. It has a 1/2 inch input socket and a 3/4 inch output lug. You attach a reaction bar to the head of the multiplier which is what does the hard work of withstanding the applied torque.
Here's my quandary. In order to achieve the correct torque values at the big nut, I must calculate the forces and moments applied to the home made wrench. I insert the torque multiplier 3/4 inch output lug into the socket I welded into the plate. The torque multiplier has a reaction arm which is attached to something solid. I then insert my 1/2 drive torque wrench which is 17 inches long into the input side of the torque multiplier and apply how much force to the torque wrench to get the required torque value at the big nut?
I think this is one of those dang indeterminate statics problems I always had trouble with in school. Anybody have an idea how to solve this problem? It is not as simple as it might seem and has me baffled.
Here's my quandary. In order to achieve the correct torque values at the big nut, I must calculate the forces and moments applied to the home made wrench. I insert the torque multiplier 3/4 inch output lug into the socket I welded into the plate. The torque multiplier has a reaction arm which is attached to something solid. I then insert my 1/2 drive torque wrench which is 17 inches long into the input side of the torque multiplier and apply how much force to the torque wrench to get the required torque value at the big nut?
I think this is one of those dang indeterminate statics problems I always had trouble with in school. Anybody have an idea how to solve this problem? It is not as simple as it might seem and has me baffled.