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Why do they have a removable cover if you can't remove it until you take everything apart anyway?!The lower pin design was probably a design that was adequate for the year the Tractor was built. Now at 83 years of age, for some of the N's, they are passed their warranty period. Once the MASS of the Axel Housing was increased in the area of the lower pin, a lower pin with a Tapered shank was fitted.:)
The surface area, of a Taper shanked lower pin, PULLED into a matting Tapper bore has a much much less chance of leaking diff., oil. The cover that was designed to be placed onto the AXEL housing with the lower pin passing through the cover was intended to add both rigidity as well as the short tapper on the shank of the lower pin was to be secured into the mating short shallow tapper cup of the removable cover. It was also a COST thing. Make a Tractor as inexpensive in manufacturing as you can so as the farmer can afford to purchase one. Lets not forget, Mr. H. Ford, happened to borrow the Differential and Hydraulics from Mr. H. Fergusons Tractor design. then rebadge ..... now the N Ford Tractor. Ford Tractor factory had little to nothing in cost design for the first early N's from AFT of the Transmission. Bob. Owner 2-N...TEA-20 Ferguson.. MF 35 X and other coloured Tractors. Some have the strait shanked lower pins. Some have the tapper shank lower pins..
 
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