look at ;
http://edgeattach.com/spring-loaded-quick-attach-coupler-for...Note security devices, two are going through large pin, one is spring loaded old style 3 point attachment system, two types of security , when removed the large pin or pins can be removed, (too many of these things are called PIN, whether small or large) the ideas to remove the smaller security devices, pull out the large PINS, that only be removed in one direction, put the 2 wishbone between the pins, push the pin back in, install safety (smaller pins, not directly weight bearin) Look for picture of Wishbones none of is automatic, and requires operator to get off of tractor, wheel tractor or D5 with tracks. not really easy.
Look at Wiki, dog bone shaped in 1 st picture ;
https://en.wikipedia.org/wiki/Quick_couplerGoes onto explain quick hitch, etc 3 types Quote; Manual
The operation of this type is done, usually by the use of tools, at the coupler itself. The operator needs to leave ,, (usually the cab) to go to the end of the work equipment in order to effect the release of a bucket or attachment, and to do the same in order to attach the next bucket or