In this you can see the movable jaw that locks the log in place both for cutting and dragging it in for the next cut. Flip the ramp on the right down for dragging a tree in wit the hydraulic powered winch, flip the chute over on the left and it connects to an ear corn elevator I modified. Can't see it in the picture but the right side tire is on a hydraulic cylinder so you can adjust the angle of the processor to match the log. I've ran 70 foot tulip poplars thru it in the past.
Below and to the left of the jaw/clamp is a limit switch I added. set the length you want to cut and the jaw releases the log when it trips. Want 16" long pieces, set it at sixteen, want 18" pieces, move the trip a few inches.
Hydraulic powered 28" bar, running 404 semi chisel chain, 63 gauge. It will snap lighter chains quite often. The valve wit the black knob is for right rear tire. Directly behind that is the rotary action hydraulic valve for controlling the bar, on that is a handle with three switches. Two toggles, one for controlling the splitter and the other for the jaw, third is a momentary on pushbutton for the chainsaw, a 12 volt piston type fuel pump is connected in the chainsaw circuit for supplying bar oil to the chain, early units were gravity fed from a tank mounted higher than the bar, pump works much better once I built a oil warmer to warm the bar oil.
Took a piece of 1 1/2" pipe 12 inches long, then a 48" piece of 1/4" brake line and coiled that up inside the pipe, welded the ends shut then added fittings for the return line on the processor, warm hydraulic oil from the processor heats the bar oil which makes it pump much easier. Also added a 12 volt cooling fan from a junk yard car to the oil cooler on the processor, the fan is controlled by a snap disc.