Signs of poor kingpin lubrication include the galling of kingpin contact surfaces and premature wear. If the kingpin is not properly lubricated, it will wear unevenly and prematurely, which can create unsafe hauling conditions. The kingpin and fifth wheel should always be well lubricated to reduce grinding between the tractor and the tractor’s fifth wheel. If a kingpin has been poorly lubricated, excessive wear can happen quickly - and excessive wear is a surefire sign of a bad kingpin. The fifth and final symptom of a bad kingpin is a lack of lubrication. It is unsafe to haul if the coupling cannot be secured properly. Here too, it’s essential that you replace the kingpin before using the trailer. This presents a similar problem to a worn-down kingpin shoulder, which is that the coupling cannot be safely secured. When this happens, the throat has become so worn down that there is nothing for the fifth wheel adjustment to tighten against. The first was the worn-down shoulder, and the second is a worn-down kingpin throat. Fifth Wheel Adjustment Will Not Tighten - Worn Down ThroatĪs mentioned, there are two key problems that will prevent a fifth wheel adjustment from tightening. The best solution is to address this as soon as possible by installing a new kingpin. This is a sure sign of a worn kingpin in need of replacement. There’s not enough material for the fifth wheel to tighten against, and if you cannot tighten your fifth wheel adjustment, you cannot safely haul. When the shoulder of the kingpin wears down, it becomes impossible for your fifth wheel adjustment to tighten securely. There are two issues that could be causing this, the first of which is a worn-down shoulder. If you’re experiencing problems with your fifth wheel adjustment, it’s usually a sign of a bad kingpin. Fifth Wheel Adjustment Will Not Tighten - Worn Down Shoulder It’s always best to get a bent kingpin fixed as soon as possible. If you’re unable to have the problem addressed, a bad kingpin can add significant wear to your tractor and fifth wheel. This is another fix to make as soon as possible. The symptoms here are similar to those that occur when it’s difficult to couple a trailer, and it’s also usually a sign of a bent kingpin or coupler. Maybe your tractor and trailer coupled just fine, but now you’re having problems uncoupling them. You’ll spend less in the long run by addressing the problem now rather than waiting for it to affect other parts of your rig. In any case, the best solution is to have the upper coupler structure and kingpin inspected and replaced if possible.
This is an unsafe way to haul, and it’s also a leading cause of accelerated top plate surface wear. Why fix it? If your kingpin or upper coupler are bent, not only are they making coupling more difficult, but they’re no longer supporting your trailer and cargo safely. What’s the cause? In the case that you’re having trouble coupling your trailer, the issue could be a result of a worn or failing upper coupler structure. So, if you’re noticing problems with a specific trailer, the kingpin could be to blame. CRENEL WRENCH, WRENCH SOCKET, HUB NUT SPANNER, FILTER KEY, etc.If you’re having problems coupling a trailer on the tractor, it could be a sign that you have a bent kingpin or upper coupler.Ī kingpin that is in great shape should make it easy to couple your tractor and trailer.
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