Hydraulic question for Ford 1920

[wood butcher]

Wathcing this thread with interest as I have a similar, but slightly different, issue with the hydraulics on my 1920. Sometimes when I start the tractor, the hydraulics will not work at all until I rev the engine to full throttle and hold it there for maybe 10 -15 seconds; then I can hear the engine load a bit and the hydraulics are functioning. I'm guessing this indicates an air leak into the suction side causing it to lose prime.

Sounds about right. Sounds like your system is sucking air somewhere. Maybe the o-ring on the suction side of the pump.