Kubota B7100 FEL only works when 3 point raise lever is pulled back

[Egon]

From the pictures it looks like the Cap and Power Beyond valve from an HST model have been bolted to the three point assembly. The loader loader return is also the same as on an HST.

I have no idea of the size or location of your pump but suspect it may not have the capacity to run both at the same time???