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Ok, I am thinking the "height/depth/external" is the quadrant lever stop that is on the right side of the rock shaft under the right lift arm. It has adjustable stops at both ends to limit the draft arms travel both up and down. The lower stop controls the lift height and the upper stop controls depth (lower limit) What the stops do is mechanically return the hand control lever to the neutral position at your predetermined travel of the draft arms. Loosen the stops on the quadrant and move them to the extreme ends of the quadrant. Start the engine and see if you have full draft arm travel, if so now you need to adjust upper stop where you want it but the lower stop must return the lever to full neutral before the piston bottoms out in the raised position, otherwise the piston will have constant full pump pressure on it and the pump will continue to run against the relief valve and overheat. So with engine running, you have full lift on the draft arms, and the hand lever is in neutral you should be able to hand lift the draft arms up another 1" or so. That will ensure the piston is not bottomed out. Note attached to the lower side of the hand control lever is the quadrant rod, this is also part of that adjustment. The hitch is designed for full travel as measured from the ground to the center of the claw 11" full down & approx 34" full up. You should set the full down after you have moved the quadrant stops to the ends but before adjusting them for desired travel. Remember you need the engine running to lower the draft arms. Set the down height on the left draft arm lift yoke first and then match it with the crank on the right draft arm, now do your desired travel adjustments on the quadrant rod and the limit stops. After everything is adjusted use the crank on the right draft arm for tilting or leveling your implement. Sorry for the long post but am in a hurry. If this is clear as mud once you get into it, post back, I will try to do a better job of explaining. Joe
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