Unimog Club UK

Tony,
The is, or should be a pin running horizontal on the clevis part, remove that pin, then release and lower the hook as normal, about 1/2 way, the clevis will lower down as well, pull the clevis drawbar outwards, and the will be 2 holes in, line up with the hole in the carrier to which ever one you need for the length of drawbar you want, then drop the same pin you removed from horizontal in the hole vertically.
Putting the lynch pin, or R clip on you need to lift the draw bar up by hand, leaving the hook down, and reach between to fit the clip.
The clevis is locked and ready to be used now, and can be lowered to ground level if needed to hitch some thing up, then raised as normal until it locks up, the same as the hook.
Has yours got an air release on the hitch?