When you split the tractor you have to roll the rear apart from the front. Normally I block the front wheels and engine and support the transmission and rear wheels and roll them away. It would be hard to do that with a backhoe on.
Loader definitely has to come off, the mounting brackets are in the way of the transmission bolts.
If you search in the Chinese Tractors format there is a posting titled Jinma Splitting Guide. It's based on the 354. You should find it very helpful.