he told you in plain english.
at this point.. if you don't know what a crank shaft is.. or where it is onthe tractor.. might be time to sell it, and use the money to hire the work done :)
integral.. as in built in.. a part of.
many tractors have a built in hyd pump.. etc.
the hyds compartment on a 55-64 is under a bug plug under your left thigh on the hyds cover..