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Moparmike

U joint at steering box help

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I'm thinking that my u joint at the box is bad because I have a spot now that locks them let's go and makes a loud pop.if I look at the box and joint with someone moving the wheel back and 4the joint slips around the top of the shaft about a half inch ..anybody have this problem before. Been on a rough haul dump truck in sand pot holes wild driver with lead foot.im hoping it's not the box 

Oh 2000 rd690 E7 auto

Thanks for the help 

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The u joints are supposed to be clocked, if someone had it apart they may have put it together wrong. Joints fight each other if they aren't clocked right.

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No it hasn't been off I'm thinking that the rough job has beat it up and caused it to slip more then it should move on the gear box shaft..cause driving it some times it doesn't even get to that point where it has that little bite of lock 

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K I'd get it repaired before it breaks at 60 mph on the highway.

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Are you saying it's slipping on the splined shaft that comes out of the top of the steering box?

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Don't know the steering gear installed but if that yoke is slipping on the steering gear's input shaft, the gear will need replaced as that shaft is the "worm", (driving unit) for the steering gear itself. The U-Joint yoke should be splined to that shaft. If it moves independent upon the shaft it has been ran loose and/or beat the splines out.

Some older trucks ran a "Bergman" joint but I've not seen one past the mid 1970's. It looked just like an upsized Mopar steering coupler and was attached at the input to the steering gear:

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Cab mount ?

 

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Yes turning on the shaft about half inch 

I didn't  know that the yoke that goes on the shaft had splines so maybe the splines are worn 

I going to try and remove the yoke from the top of the shaft and see what things look like 

But I know if I have the truck up on the jack with no pressure on the steering it turns free no binding or locking 

Mack dealer said could come from pot holes on the job binding the u joint set up beyond its travel and wild driver trying to fly on job site which I know they do I've gotten on them before for the same reason 

I'll try to get a picture of the problem thanks 

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No tolerance on that input shaft to the steering gearbox. If you take the setscrew, or drivepin out of the yoke it will push back and away from the steering gear collapsing the sliding splines at the base of the steering column in the cab. If you can detect any wear in those splines once exposed the steering gear needs replaced along with the yoke.

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Ok guys update truck has been fixed

 

Turns out the pin in the spring pak on driver side was broken and the u joints on the top of gear box and inside can was worn out no splines left inside them 

Replace and truck is back working like a dog lol

 

Thanks guys 

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Thanks for following up. The splined yoke being stripped is not uncommon and really what I suspected as the steering gear input shaft is induction hardened, the yoke is not. Usually when they are run loose, the problem exacerbates itself. In your case the rough atmosphere hastened failure. Those u-joints get a workout and really need all the grease you can spare yet they are very neglected my many. The splines in the cab steering shaft are another area that wears and is neglected; especially with an air ride cab. The center pin in the spring pack breaking is a result of years of use, being run loose, (u-bolts) or impact such as potholes.

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