Boy Bert you are two for two today.
The YTA mowers uses a CVT transaxle from GTI which is usually the RS800.
Now to the OP question. Take the mower out and drive it around for about 30 minutes. Then you feel the bottom the transaxle for excessive amount heat. If not found then you are okay. The grease on the wheel can look worst than it is. Here is an example.
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Now if you got to add grease then here is where it is added.
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