' It probably has a Peerless transaxle in it and they do make a kit with a filter and fluid with a fill kit. When I was working on landscape equipment about 38 years ago I used John Deere hydraulic oil in all the hydrostatic drives.

Gus beer

64 Plymouth Savoy
493 Indy EZ's by Nick at Compu-Flow
5-Speed Richmond faceplate Liberty box
Dana 60