This came off a BuiltRite 28' belted firewood conveyor. Powered by a GX 160 Honda. There is a flow control valve to regulate belt speed.
The conveyor tipped backwards, which I believe contributed to the hydraulic motor shaft failing the following year due to stress fatigue from misalignment.
If I remember right I ordered a new motor from Surplus Center.
I also changed the mount at that time, adding an 'overhung something' to protect the hydraulic motor from side stress, and changed the coupler from a solid coupler to a double chain coupler.
Good luck...