Hi Steffan. The only full Greenfield owner manual, showing how to replace that belt, we have uploaded at present is the Evo 3 Mk 2A, but as far as I know, the drive belt setup is similar to yours. Here is the instruction sheet:
[Linked Image]

If you have problems please tell us - I probably won't know the answer, but we have a number of Greenfield enthusiasts here.