![]() ![]() Packed snow, ice or dirt can also restrict the workings of the lock, and be a problem around the fifth wheel shims, backing plate and buffing rubber. A bent cover plate can interfere with the movement of the lock, while a jammed safety latch can also cause grief. Just try to couple smoothly if you’ve a bent lever bar, lock arm, or operating rod. Then again, bumps, bends and jams are other sources of problems. So too can you have problems if the jaw opening has spread too far apart because someone tried to couple to the trailer when the kingpin was sitting too high. (The remedy here is to check the adjustment using a new SAE kingpin or special test gauge.)īut an inexperienced mechanic, a worn kingpin, or even problems with a fifth wheel’s adjustment mechanism could all be the cause of initial trouble. For example, you can over-adjust for trailer kingpin slack on an ASF Simplex Series Slack-Free design. One source of trouble can be a jaw pin that has over-adjusted for kingpin slack, although the make and model of fifth wheel will determine the cause of this problem. Please contact reception as they can organise first aid and also ensure that the accident is recorded.As simple as a fifth wheel can appear to be, problems experienced as you couple or uncouple to a trailer can be linked to an array of issues.
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