Small Engines (Lawn Mowers, etc.): hydrostatic transmission, hydrostatic transmission, seat frame

Question
QUESTION: how do you check and fill the fluid in a hydro Transmission,where do you fill it from.i did see a rubber hose under the seat frame with a red plug on it ,and how will i know when it is filled to the correct level/ and is there a filter inside a hydro trans.is it best to change the fluid and filter?
ANSWER:   Hello Rob:

 Send me the All the Information Off the OEM Tag on the Hydro Transaxle, Please. With this Information I can Locate the Proper Manual and Better Assist you. Thanks.

 Respectfully

 John

---------- FOLLOW-UP ----------

QUESTION: KEY JOHN,THE ONLY THING I FOUND IS ;HYDRO-GEAR AND THE NUMBERS 7213T2016, SULLIVAN ILLINOIS,HOPETHIS HELPS.

Answer
Hello Again Rob:

No Worries. I have Requested Information from Hydro-Gear on this Transaxle. They will Respond within 72 Hours and I Will Send you a Follow Up wen I Receive  Their E-Mail. In the Interim, Send me the Model Numbers Off the Mower, Please. I Might be Able to Use them to Locate the Manual I Require. However, Add 1/2 Pint at a Time Until the Transaxle Starts to Move and The Add 1/2 Pint More. Usually these Transaxles are Non Serviceable. Thanks.

Respectfully

John