Hydro Transaxle gets a bit slow when it warms up

Skippydiesel

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John Deere Sabre with Kholer 17.5 hp engine.

This mower must be at least 30 years old. Owner says he purchased it, about 30 years ago, second hand, from a mower repair shop and that they put a brand new engine in it at that time.

The mower initially starts runs well and appears to be fully functional BUT as the work time passes, the mower gets slower & slower - reverse will hardy work at all.

I have told the owner that it is likly to be uneconomical to repair, however he wants me to have ago.

I could not find a model/serial number.

At this stage I am planning to remove the transaxle, drain the oil and replace it with new. Please advise grade of oil (I am in Australia so brands unlikly to help much).

FYI: I have 4 litres of a 25W70 mineral oil, on the shelf
 
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