There is another adjustment screw for end play in the gearbox steering shaft (the shaft at 90 degrees to the worm).
The gearbox seems to be operating smoothly,and I have adjusted the worm end play to provide some clearance, but not bind. I addressed small problems within the steering column, and that no longer has any appreciable friction. When jacked up, the kingpins and linkage are all very smooth with no friction. They use a half nut for more surface contact. They even mention their steering gear box in the maintenance manual, their improvement on the usual segment and worm. Thanks, and good luck.Įdited Novemby edinmass (see edit history) Post a photo of the steering box, and front end parts.especially the spindles.
#Causes of worn king pins full
It was probably set up for dirt roads with a full load at lower speeds. The advantage of doing everything is when you're done, you can align it properly for todays roads and driving habits. It's probably got old rock hard grease in a joint somewhere. Installing king pins can be a huge task.making the parts, and pressing them in and out.as well as installing new bushings in the axel.Some spindles have bushings, others bearings.
Usually by the time you are this deep into the steering, it's easier to just pull everything apart. I would disconnect the drag link and center link between the two spindles, get it so you can individually turn each spindle by hand. I have seen crazy things bind steering systems.a rope seal on the chrome cosmetic steering column.actually making the car steer very poorly. A 1 1/2 ton truck is just about the same as a Cadillac or Packard car. I would expect they purchased a steering box from an outside supplier by the late 20's. That will give me a sense of how much leverage I actually have at the steering wheel. It may be worthwhile to jack up the front end and try the steering with someone offering resistance at the tire. (I've had plenty of trucks without power steering, so it's not a matter of perception.) In any event, once the front wheels are on the ground ( stationary or in motion), it requires an unreasonable effort to make a turn. I've never given much thought to the ratio of a steering gearbox, but it must be designed either to be easy, or to be quick. It feels like the gear ratio within the steering gearbox wouldn't enable that.
It is definitely not possible to turn the front wheels and make the steering wheel spin, however. The steering wheel moves the front wheels through their range of motion quite easily. Likewise the steering column, and likewise the steering gear box itself. When the front axle is jacked up, the kingpins and associated steering linkage have near zero friction. The solution to this problem continues to elude me. Tightening my top kingpin nut should pull the pin up into the axle and seat it firmly, so that the pin will then turn in the bushings, not in the axle. The tapered mount is how Mack truck kingpins work. PS Just researched and answered my own question. Here's a question.Assuming that fixing the kingpin in the axle is the usual method, is doing it with a taper common ? Fingers crossed that I won't need new kingpins.Įven if the taper is worn a little they should still seat firmly if I make the necessary adjustments. I'm hoping that I can get the kingpins out (should be easy since they are tapered), clean up or replace the bushings, and put it back together with the kingpins rotating in the bushings, not in the axle. So I think I've figured out the problem without getting dirty ! With the axle on jackstands, if someone loosened the upper nut on the kingpin, gave it a rap, and then forced grease into it, they might think they were freeing up the pin.In fact, they would be loosening the pin from the axle, where it is supposed to be fixed, and leaving the top and bottom bushings frozen. It stands to reason that this (if it's loose) would rotate fine until you put weight on it, at which point it would be pretty stiff. If it is instead rotating in the axle (where it is supposed to be staionary), that's where the kingpin is tapered. So here's my guess.the kingpin may be seized in the steering knuckle bushings where it is supposed to be rotating. It is the bushed top and bottom, the upper bushing being smaller than the lower, since in between the two it is tapered. The kingpin appears to be mounted in the axle with a taper, which seems like a good design when it's time for replacement. That may help me to understand how the kingpin assembly is supposed to work, and how it might be malfunctioning.įirst off, there is no thrust bearing, just a thrust washer.
#Causes of worn king pins manuals
I am fortunate in that I have detailed parts manuals for this truck with excellent diagrams.
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