(quoted from post at 11:04:17 09/21/18) You can reseal a control valve without a kit. Normally involves
taking apart the valve and matching up the various seals and O-
rings. In fact the O-rings for the 730s various control valves are
listed at Messicks (see link at bottom). The 730 used different
valves with different features as shown in the specs below. And
yes, you can cobble in a new generic control valve if you want but
that would involve finding a valve with the features and flow
capacity you want, devising mechanical mounting arrangements, and
dealing with adapting the hydraulic plumbing to the new valve.
<img src = https://i.postimg.cc/Px207CpQ/Ford730_Pump_CVspecs.jpg>
Messicks 730 loader parts