JCB 1400b fluid types

[tpoag]

I just bought a JCB 1400B backhoe and was wondering what type hyd oil to use. Also,the guy I bought it from had just changed the fluid in the transmission and said he used hyd oil, even though I think it calls for ATF.
Any ideas.....thanks

[stock]

Atf in the tranny the hydraulic is climate dependant .

[tpoag]

So...would 31 be pretty safe for the hyd?