Don't mean to be confusing, just trying to better understand the operation.
I thought if the pressure at the LS connection at -connection A- was high it would have meant something was 'requesting' pressure.
If -something- requests more pressure is there a diverter valve someplace that would direct the pressure to the 'requester' ?
How is the LS 'signal' routed so the high pressure knows who's requesting it ?
"When the pump controller on the pump is signaled to increase PUMP flow/pressure, which shows up at the SCV's, the 3-point valve, the "power beyond" loader valve, etc."
Then if I operated the 3-pint hitch and also moved the levers on an SCV should it have high pressure/flow ?
Just trying to come up with ways to help isolate whats going on.
I don't think 100 psi in the control circuit is REAL significant, at least at this point and is NOT the cause of your "no flow" problem, I don't think.
The brake valve HAS been known to develop internal problems that can direct oil into the control circuit, but that keeps pump at high pressure all the time (NOT good), but wouldn't cause a "no flow to the SCV's" issue.
When the pump goes to a high pressure, the SCV's, loader valve and hitch valve ALL are in parallel, nothing "directs" that pressure and resulting available flow to one or another.
In the case of the pump not being able to make much flow the "priority valve" directs what flow there is to steering, and (IIRC) regulates steering and brake maximum pressure.
I don't know enough about the "innards" of the SCV's to know what could have possibly happened after you worked on them.
The "dime valves" control the direction of the control circuit oil flow so that the SCV needing the most pressure controls the pump pressure, even if something is wrong with how/where they are installed that wouldn't affect the pump FLOW to the SCV's when the loader valve is being activated and the pump pressure is up as they SCV's are fed in PARALLEL with the loader valve.
(The couplers on the SCV's don't have pressure/flow even when the loader valve is being activated, correct?)
OK! So the "light" just went on here!
You have three electronically-operated valves and NONE work, even the two you didn't have apart, while other functions DO work.
I'll bet something has happened on the electronic/electrical side, is there a common (to all the valves) harness connector that could be dislodged, or a chafed wire that could have caused a fuse to blow?