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I honestly don't know if the hydro drive has two separate chambers. I found a drain plug on the side that sits flush and has to be removed with an Allen key. . Its been three years but I was sure all the oil had drained but if there is another chamber then I never noticed. I would just use wd40 as it lasted many many years,I only changed it because the one original owner never did. I do suggest to change the differential as well cause mine had turned to jelly.
This is a copy from a previous post.
(First I am not trying to step on any ones toes,I am just a backyard mechanic but one that loves it.
I just want to mention, (and I have before two or three seasons ago),that I did change the hydro drive oil in my 3600 and its nothing close to what I am reading in here.
I am not and cant speak for any other model.
All I remember having to do was, (1)( take off the seat and remove the cross bracket(2) I had to look very closely but finally spotted a flush mounted set screw that needs an Allen key to unscrew.
(3) With the fill cap already removed to allow proper drainage I removed the screw and all the oil drained out all over everything (forgot the drain pan but it would have not caught it all). I didn't bother to flush some new oil through but may have been a good idea since this was the first oil change in 14 years. (Previous owner told me he only changed the engine oil.) I have read more than once how you have to remove the auto stop safety rod etc. I have no idea why its necessary. (4) I replaced the drain screw and filled it up with new oil, (I did rock the machine slightly to make sure it was full). (5) I replaced the cap started the machine ran it gently in forward and reverse checked the oil level again and it was still full.6) replace bracket and seat.
I have used it for three summers since and its just as good as new.
In a nut shell it was remove seat and bracket, take the fill cap off,remove drain plug and drain oil, replace plug add oil and replace the fill cap, replace the seat and bracket, and your done.
Now I regret not posting pictures but I didn't take any, that being said I would be more than happy to do it again and take pictures as its been three years so it wont hurt plus I need to change the differential any ways.
There is a lot written about air traps etc but I have never had to add one drop since I filled it, I cant swear this was the standard or right way but it was fast and it worked.)
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