I have a B2400HSD. My tractor does not appear to be plumbed as shown with the return line going directly into the main line. I could be mistaken but this does not seem to apply to my problem. Again, since I've been using AMSOIL hydraulic fluid, with the exception of the first 2 or 3 mowing jobs, I've had zero problems. In the past I used UDT, Super UDT, Bobcat fluid, and TSC fluid. When I was using any of those fluids, after an hour of hard mowing, I would completely lose the power steering when I made any left turn. Thank heavens for the AMSOIL.