8860 Auto Chassis (Expert Builder/Technic)
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Tractor and reciprocating implement with 3-point hitch articulated steering and 2 cylinder engine
Because the set has only one crown gear (and that's part of the differential), I had to use it to run the PTO shaft. So two 16 tooth gears were used to route a shaft above the differential to drive the two square pistons.
Push-rod Steering:
An 8 tooth gear pushes and pulls rack gears connected to the front half, pivoting it left and right. (Note, however, only one rack is actually attached to the pivot. The other is for looks because if it were connected it would cause binding and limit the sharpness of the turn.)
3-point hitch: A gear pushes a rack forward or back pulling the top of the two bottom arms.
A vid of the functions can be seen below (or downloaded here):
Chopper Motorcycle with one cylinder engine, front and rear shocks.
A less radical fork below
