Infrequently I've had this problem. It always happens after I try to back under a trailer that has been left too high (landing gear left too tall).
When this happens, everything looks normal: trailer sitting evenly on 5th wheel, 5th wheel release handle in, 5th wheel jaws closed around kingpin. However, when I pull against the trailer (tug test) the trailer slides off the 5th wheel as smoothly as when I'm dropping the trailer.
Here's the fix the mechanics showed me, much easier and cleaner than my old fix. Pull and hold the 5th wheel release handle for 5 seconds. During this time the jaws will slowly slide open and the lock mechanism resets. Now when I back under the jaws close and I hear the "click" sound as normal.
My old method was to have someone try to pull the 5th wheel jaws open as I pulled the 5th wheel release handle.
I've never had the "pull and hold" method fail to fix the 5th wheel won't latch condition.
Lastly, ALWAYS DROP YOUR TRAILER HANDLE WHEN DROPPING A TRAILER. Don't leave it sticking out from the trailer, it will bent or broken and the next driver will be screwed.
Fifth Wheel Won't Latch Onto Trailer
Discussion in 'Experienced Truckers' Advice' started by tscottme, Feb 17, 2012.
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davetiow, Raiderfanatic and 70s_driver Thank this.
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Yeah, I've had it happen before where I missed the kingpin and it was on the front side of the fifth wheel. Not hard to fix, just a PIA. As for the problem with the fifth wheel, I would insist that they either repair it or have the fifth wheel replaced. I envision the trailer seperating from the cab as you drive down the road. A problem I wouldn't wish on my worst enemy. Remember, if something happens it's on you.
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Thanks for saving my bacon!!!!
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Last edited: May 17, 2014
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Different trucks have different 5th wheel heights, back up so that you can see the height of the trailer lower the trailer so that your 5th wheel will pick it up, let the air out of your drives back under then refill your airbags. lifts the trailer up. As far as the 5th wheel not latching properly time for a good cleaning, grease job and adjustment .
davetiow Thanks this. -
I've had just the opposite happen. I pull the handle to unlock, get back in truck, put into gear and the handle unlatches and relocks the 5th wheel. Then get back out, pull handle till it locks, get back in and release brake.... and,handle slips back in.
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