hustler wheel motor rebuild

here are some pics off a super z im no hydro pro but it looks like the orings were bad from the dark swirls on the outside of the plates but on the end cap there is some groves in one spot any guess what thats from and could this piece be reused thanks

Looks to me like contaminated lube / lack of proper maintenance. Were the oil filters loaded? Did you cut them open?

im not sure i just picked it up real cheep and wanted to learn about the hydro system so i dont know any of the history on it i have already rebuilt the hydro gear on this side and was going to rebuild the wheel motor but i dont think the end cap is good with the cuts in it and yes i have new filter and oil for it just thinking i probably cant rebuild this motor and should just get a new one