A few questions regarding Hydro-gear transmissions; oil filter leak

Jonmower said:
Replacing a filter and hydro oil is not a repair, it is a maintenance. Sure, I could have pushed for a free oil change, but then I would have been out the pickup and delivery fees and I probably would have waited at least 1 week, perhaps 2 weeks, for local service. If this does not work I will take it back.
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I was referring the initial oil leak. Yes oil and filter changes are maintenance items the owners can do but many under warranty units requires to use their filters and oil.

And those dual step filter cap wrenches are just a pain to use either installing or removing a filter. This is why I have a very pair of Channel lock pliers and very large screwdriver with a BFH when that don't work.
 
I have a set of those cap wrenches that I think I bought at HF. Comes in a blister pack that has all sizes in it.
 
Just thought I would give a bit of a followup on these leaks. I have only mowed a few hours after changing oil in both transmissions, and have not seen a leak so far.

I reached out to Toro, and got a useless form letter reply.

Hydrogear, however, does take some time to give a thoughtful reply, so I thought I would share it for anyone who might be interested.

This was my note to Hydrogear: (I deleted the description of the problem here, as I mentioned it in my first post)
1. Do you think this was just loose filters from assembly at Toro?
2. Do hydrostatic transmissions run under pressure? The oil seemed to spray around a little too.
3. Do you think there was a chance the the filter found enough particulate to get plugged and then pressure caused a leak?

Here was the reply from Hydrogear:
Hello
  1. We install the filters in our assembly, these units are leak tested before leaving but it could be possible that it somehow snuck through or something else happened.
  2. The internal components are pressurized, but the case is not. You would likely have a seal blow out long before enough pressure was created to have an issue with the filter.
  3. Unlikely, if there was enough contaminant to create that big of an issue it would likely be from a metal component coming apart internally; This would cause drive issues.
•If you still have the old filters it would be worth checking to see if the o-rings are torn on one or both.
•If it isn't a major leak you should be OK to carry on. If it does start to leak for a third time I would look for damage, deformities, or porosity in the housing where the filter seats.
 
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