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5th wheel adjustment problem

I have a holland 5th wheel and feel a jolt and noise from slack in my 5th wheel when I start moving forward or reverse . I've turned the adjustment nut out one turn but the problem is still there. How do I know it is adjusted properly? Should there be any gap between the adjustment nut and the 5th wheel when the jaws are locked ? Thanks.

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The adjusting nut should backed out several rounds then lock the 5th wheel and tighten the nut up till it touches the 5th wheel plate. I would also have someone watch as you move your truck forward and backward to see if there is play or slack in the slide teeth. If you don't usually move the 5th wheel slide the teeth will wear over a period of time making it feel like wear in the 5th wheel jaws. ''italic text''

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It could also be the pin on the trailer getting worn. I feel slack when I haul my dedicated trailer , but if I ever switch trailers it goes away. I had my companys fleet maintance shop check my 5th wheel and it is as tight as a drum. My trailer pin however showed to be about 1/2 worn out with their measuring guage , but they refuse to change it until it will not pass the gauge test.

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When you check your jaw adjustment be sure to use a new king pin or at least a newer trailer. If you don't you may over adjust the jaws to fit a worn king pin. When you hook to a new trailer the jaws will not close all the way even if the handle is in, or they will close and be very hard to open.

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When adjusting the fork pin and you tighten the nut be sure that you are able to turn the washer spacer by hand....

5th wheel bushings wear out and will cause the same effect as loose jaws....

Do check for play as Jess suggested...if there is alot of play there it will make rounding curves unstable, because the trailer is tilting on the 5th wheel, and it will rock on rutted staight streches causing uneven or cupped steer tire wear... especially if your driving a long WB tractor or a pacar truck because of the frame design...

we right away blame it on wheel alingment....

Bushings are a cheap and easy fix and you can do it your self in under and hour with hand tools.

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You can also take a long pry bar and check the hinges in the middle for excessive play. There should be no gap between the adjustment nut and fifth wheel when in the locked position.

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Holland Simplex has a hexigonal pin that you can turn to three different positions to adjust the jaw. If you still have slack in the 3 position, you can get an oversized pin. If that doesnt work, you may have to replace fifth wheel top plate if it is worn.

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I have a simplex SE series and I'm in the 3 position and I goggled the number and found a new replacement top plate for 800.00 without shipping out of Iowa. the guy said he could probably find me a top plate near me that I can pickup myself.

www.midwestwheel.com

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when you say back up the knot you should in fact say back up the jam knot because the jam knot is to hold the adjustment bolt now you lose the jam knot at the same time you hold the head of the bolt at the same time in the up posit side so it wont turn with the jam knot then at this point you hold on to the jam knot and slowly turn the to the right until you feel it wont turn no more and bake up just a few degree so it wont be to tight at this time you hold on to the bolt so it wont turn and turn the jam knot to the right until is tight so the main adjustment bolt wont turn freely

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Jerry Peters will be eternally grateful.

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