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    The best way to find out how an unknown pump control works (when you don't have any technical info on it) is to "gut" it, study in detail, follow the oil passages and come up with the schematics using your head and prior experience. This procedure can be applied to any unfamiliar component and is called back engineering. It is, by far, the best way to learn existing industrial designs and a great mind exercise. Here are some of my own "back-engineerings". If you bump into a mistake, please let me know - I am doing my best to present the information as accurate as possible, but I am still only human...
Sauer Series 90 Pump
Sauer Series 51 Motor
Liebherr LPVD 064
John Deere Radial Piston Pump
A Very Important Add-on for the John Deere Radial Piston Pump
Kawasaki NV111DTK176R
Komatsu Pump From PC 240
Caterpillar AA4VG56DWD1
MS control for A4VG Rexroth pumps, used by O&K, Liebherr, and others...
Komatsu D7F50026 pump, simple displacement control - first stop before going into OLSS
Komatsu OLSS Pump, pressure cut-off and torque limiter - the OLSS, finally!!!
Filter holding manifold with cooler connections, an option for Sauer Danfoss series 90
Komatsu Pump From PC 340 - thorough this time!
Uchida AP2D14LV1RS7 Double Pump
HP pump M6PV72-72, with automotive and pressure compensator control
Kawasaki K3V - Transforming Negative Displacement Control into Positive
Linde BMV 105 Variable Displacement Motor
Rexroth A7VO55LR3E