Mike L; all my farm brands I work on have their own parts schematics online through their website. John Deere, Case, IH, etc. Can be a real timesaver in the field or shop if service is available. One app I found that helped me diagnose a powershift failure on a David Brown:cussing was a free tachometer
app. The output shaft was only turning 40-90 rpm (too slow for my hand tach). Place a piece of reflective something on what's turning and hold the camera close enough for it to pick up. Gives a real time readout.
The Torque Pro app with the Bluetooth plug in is great for vehicle diagnostics. My Chevy 4500 was giving me injector and trans grief and with it I was able to diagnose the problems and clear codes. Got my a** out of a crack on a service call miles from home.