Durst L184 Hemot Head lift motor with power supply and controler. This is the later version of the Lamot Motor.  Missing Gear.   Direct replacement for the manual crank.  I cannot say the gear on the manual crank will fit on this item but they usuall do though I have seen exceptions as Durst made a metal as well as a nylon gear.  The origional on this one was nylon.  The pin is incuded for locking the gear in place on the shaft.  Functions as should.  Auto safety stops to shut off motor when the maximum/minimum elevation is reached.