Originally Posted by
l00kin4
Certainly not relevant for everyone, but I bought my D4 6 months old and it had seen plenty of red dust. One of the many things I had to clean out was the workings of the hitch receiver.
Looked cleanish on the outside but the dust had settled inside the housing (there was a good 5 or 6mm just sitting in it!), had delubed (is that a word?) its mechanism and was stopping the locking pin extending properly in the nice spring loaded way it normally should. It would just drop out because of this.
Pretty easy to open it up - remove the little silver cover, clean it out and lube it up.
David