Difficulty unhooking trailers in cold weather

Ah winter..always fun lol.

So here is my issue:

I am dropping a trailer:
-Trailer brakes set
-tractor bumped back, brakes set
-dolly legs down to usual height for dropping trailer
-fifthwheel handle pulled all the way out
- jaws stay closed

No matter what I do i have to fight with the darn thing to get unhooked.

Last night I got out from under it by dumping the tractor air, cranking the trailer up and eventually the jaws on the fifthwheel opened and I got out from under it.

What am I missing here? Only happens in cold weather (-20c or less usually).

 

Yeah, that's a good idea, I did get a big lump of grease out of there last night.

I was moved from the truck i had for the last few years into a truck with an x15 and 18 speed Eaton. Like it but hate the fithwheel lol.

 

Nice video, but that is not the problem, I know how to pull the pin and it locks out as it is supposed to do.

 

Yeah, I'm going to look at cleaning g any bits out that I can.

Really should have thought of this when it was warmer lol

 

Sadly no, lol.

But looks like we are getting a Chinook...going from -25c today to +3c by Monday.