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Rockshaft problem

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Jerry S

09-06-2001 11:36:51




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My 48A lift arm shafts are not equal positioned, one is about 1/8 turn different from the other. I assume one of the 2 rockshafts is bent. Looks like I have to take off the right side end piece to get shaft to come out but not sure if I can operate on this without taking the whole rockshaft housing off or if I can do this by taking powertrol box off only. Is there a chance that a shaft is not bent? Is there any tricks to this job or is it simple? Both shafts turn but stay equally off. I use this tractor all the time so I don't want surprises I can't repair right away. Thanks for your help. Lots of very good hearted people on this board.

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Dave K.

09-17-2001 17:32:00




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 Re: rockshaft problem in reply to Jerry S, 09-06-2001 11:36:51  
I just had my rockshaft apart on a 48 A and there are a left and right arm that spline into a center piece which is moved by the hyd pressure. I would suspect whoever put yours together got one side off from the other by a spline or two.

Dave



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Bob K

09-10-2001 06:38:00




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 Re: rockshaft problem in reply to Jerry S, 09-06-2001 11:36:51  
Jerry, I'm in the process right now of painting my rockshaft assembly and I know the answer. As stated by ToddT, the shaft is made up of two halves having six splines that slide into the piston lift lever. Your two shafts are not "clocked" at the same position -- one of your shafts is 1/6 turn off. (It is not bent. No tractor JD made during that time could produce enough pressure to twist that shaft without destroying the housing!)

Remove the Power-Trol assembly as ToddT indicated and you'll see the lift lever. On the lever assembly, you'll find two pins similar in design to a PTO shaft locking pin which hold the two shaft halves in the lift lever. Remove the cotter pin or safety wire from the pin for whichever shaft you want to re-align and -- this is the tricky part -- slide the locking pin forward enough to release the rackshaft half and slide it out. Be careful to slide the pin just enough to release the shaft. If it falls into the bottom of the housing, you'll have a devil of a time trying to fish it out. Since the shafts ride on a simple plain bearing out at the square end, nothing else should get in your way. I hope this helps. robert.kindig@alcatel.com

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ToddT

09-07-2001 03:10:59




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 Re: rockshaft problem in reply to Jerry S, 09-06-2001 11:36:51  
Wait a minute. Unless I misunderstand which tractor we are talking about, your tractor has two rockshafts, a right side and a left side. Each end of each side is square. In the center of the tractor (right in front of the Powr-Trol/Powerlift valve housing) the two sides slide into a crank arm that is in turn pushed back and forth by the internal piston.

If your lift arms are off by 1/8 (as opposed to 1/4), then you probably have a twisted shaft, though I don't know how it could possibly twist that much. You might take a good look at your lift arms first to make sure something isn't wrong there before doing other disassembly.

If you do decide to tear into it, you will first need to unbolt the Powr-Trol/Powerlift valve housing and remove it. Once off, you should be able to examine the crank arm and the inside ends of the rockshafts and go from there.

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Jerry S

09-07-2001 06:12:04




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 Re: Re: rockshaft problem in reply to ToddT, 09-07-2001 03:10:59  
Thanks for the help. It is actually the rockshafts themselves that are off. The way I discovered it is when I put on the 801 rig. I got to looking and sure enough there it is. I can't figure out how someone could bend a shaft without breaking lots of something else. I thought I could just make the 801 compensate for it but I have to get the adjustment screws to loosen up first. Meanwhile I am concerned about the internal parts to the rockshaft mechanism. I have a parts tractor around but not sure if I need to get some bearings or seals before I start the process.

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chris

09-06-2001 15:35:06




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 Re: rockshaft problem in reply to Jerry S, 09-06-2001 11:36:51  
I'm not sure what sort of dissasembly would be required to remove it, but your rockshaft is a one-piece unit. If one side of the rockshaft is off from the other, I'd guess the shaft would have to be twisted (though I wonder how this could happen without some serious force being put on it. It's a pretty beefy piece of metal).

You could get a replacement rockshaft for next to nothing, I'd say, since many restorers get rid of the lift assembly and replace it with a plain cover. Check your local boneyard, or drop me a line. I know a guy who probably has about twenty of them.


chris

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