R420:
Monkey241:
Interesting comment on checking underneath after the coupling.
Is a supposedly couple trailer anymore or less dangerous than a freestanding one? [emoji1787]
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Once you’ve driven artics for a few years you get to know the sound of the pin engaging and locking. There are rare occasions when it doesn’t sound right and often when you check you’ll find that it hasn’t locked in and the pin release arm hasn’t gone all the way home so you can’t fit the dog-clip, or the spring L-shape piece hasn’t dropped down because the arm is blocking it. It’s more common on units when the 5th wheel coupling is worn and nearly always happens with heavy (loaded) trailers the most.
Other drivers may disagree but personally I think it’s a good habit to go into by ducking under the trailer after coupling and shining a torch in the jaws to check that the locking bar is in place. It gives that peace of mind that you’re coupled up correctly. Should be taught on the test imo as the tug test isn’t foolproof.
Couldn’t agree more, i shine a torch up the fifth wheel’s bum every time after connecting up.
I can’t see as the lad has done any wrong here, presumably he’s reversed up to the trailer and just popped his head under to double check he’s lined up well.
Good lad i say, if he’s got a regular allocated tractor unit and a regular trailer specs the lining up check won’t be necessary after a while, but it never hurts to stop get out and see how you are for height before backing under, and when i back under i get a foot or as close as practical to the fifth wheel and then raise the tractor suspension so the legs are just clear of the ground before connecting up as gently as possible, do it like this and almost never will there be a misconnect.
Right, i’ve told this before but it bears repeating, it is possible to connect up (usually on uneven ground) and for the fifth wheel to close up and be a able to insert the safety clip, BUT, the trailer king pin is not sitting inside the jaws, the jaws have closed and the king pin is sitting on the closed jaws.
Many years ago, back in the days of York BigD fifth wheels, one of our drivers travelled some 120/150 miles empty only for the trailer to bounce off on the London Embankment at night, none of us could believe this could happen.
A few months later i collected a fully loaded trailer that had been dropped on a corner on the ■■■■, when i hitched up, as R420 notes, the fifth wheel didn’t sound quite right as it went home.
So dragged the trailer down onto level ground, looked up its bum and sure enough that king pin was sitting on the closed jaws not inside, also daylight could be seen between fifth wheel and rubbing plate.
So, people, take R420’s good advice, get in the habit of looking up the fifth wheel’s bum after you’ve connected up, it takes 10 seconds whilst you are down there putting the dog clip in.