Ok, I know this is a stupid question(s), but I am just not sure the manual is correct on this. It shows that the drain plug for the hydraulics is the one labeled with a number 1 in the pic below, but it looks to me like that is one of the bolts holding the rear end casing on, and not like a drain bolt.
However, the one labeled number 2 in the pic looks more like a main drain plug and is located where I would expect it to be... So, is the manual correct? If so, what is the other big plug for? I am doing the 50 hour service and I am just going to drain and replace all the fluid as well as the filters for the Hydraulics and HST. Which BTW, does the one plug drain it for both the Hydraulics and the HST transmission? I know they give separate fluid totals for each in the manual, but I didn't see any place in the manual for a separate drain plug or fill plug for the HST.

However, the one labeled number 2 in the pic looks more like a main drain plug and is located where I would expect it to be... So, is the manual correct? If so, what is the other big plug for? I am doing the 50 hour service and I am just going to drain and replace all the fluid as well as the filters for the Hydraulics and HST. Which BTW, does the one plug drain it for both the Hydraulics and the HST transmission? I know they give separate fluid totals for each in the manual, but I didn't see any place in the manual for a separate drain plug or fill plug for the HST.
