Abstract: A draw pin assembly includes a hammer strap that mounts on the drawbar and a draw pin that extends through aligned draw pin holes in the hammer strap and drawbar. A latch mechanism supports the draw pin in a retracted position while a trigger in the hitch-receiving space of the assembly releases the latch when a towed implement hitch comes into the proper alignment with the draw pin. An automatic locking mechanism is used to lock the draw pin against inadvertent release. The latch and locking functions are provided by a loop type handle connected to the draw pin. This eliminates elements projecting above the hammer strap to maximize the clearance for a tractor power takeoff.