I just want to add this. Always check the fifth wheel jaws by noting the position of the pull bar AND ...... Get under with a flashlight and check that the jaws are locked and the safety is in place. Learn from sight what the many different fifth wheels look like when latched fully.
Excessive grease, cold weather, snow packed in the jaws because you didnt clear it from the plate and jaw crevice before hooking and debris all can prevent the jaws from latching fully. Fifth wheels are about $3500 new and are often rebuilt when worn out to save money. An improperly latched fifth wheel MAY hold when you test it with the hand valve leading you to think its ok. Usually the first turn out the barn is when the trailer falls off. Ive even seen some go a mile before the trailer slides off.
The point is that its your responsibility to protect the public, the freight and equipment. Get under and check those jaws day or night. Turn the tractor on an angle to see up in there if there isn't much room to crawl under.
PS, Little trick to keep your pin from getting pulled when your parked...... apply trailer emergency brakes then put tractor in gear and put a little tension on the fifth wheel jaws by putting slight gentle forward motion (take up the slack/slop) to tractor then apply tractor brakes. Very hard to pull the bar out like this.
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