Dixon hydrostatic oil measurement?

[wjspw]

I have a Dixon 2002 model 4515B mower. It has a hydrostatic transmission, one on each side, not connected. How do I measure the fluid level? What is the correct fluid level? There is no tank under the seat.

 

[mechanic mark]

https://www.jackssmallengines.com/pdf_documents/Dixon/4515B_owners_manual_2002.pdf

https://www.google.com/search?q=HYDROGEAR+IZT+HYDROSTATIC+DRIVE+TRANSMISSION&oq=HYDROGEAR+IZT+HYDROSTATIC+DRIVE+TRANSMISSION&aqs=chrome..69i57.45029j0j4&sourceid=chrome&ie=UTF-8

Look through websites above