Steering problem

Is it advisable to shorten a drag link tube for a 601 series tractor with manual steering? Not much, maybe a half inch on both sides. I recently put a rebuilt steering box on my tractor, and when driving in 3rd or 4th gear, the tractor pulls a little to the right. I've adjusted it as far as I can. There's about 1 1/2 inches of thread showing on the left drag link ends, but the right side is tightened all the way up. If I move the right pitman arm back, then, due to the way it's splined, it's too far back.
 

When I replaced the old box, I pulled the pitman arms loose and left everything else connected. After bolting the new box on, I counted the turns on the steering wheel from left to right and halved that. And reconnected the pitman arms. The left one was god, but the right was off a bit, and I had to tighten the adjustment all the way up. It's close, but still pulls slightly to the right when traveling at speed and you let go of the steering wheel.

Is there any way to adjust the steering other than the drag links?
 

Ultradog, you were right (sort of). I decided to check this even though I didn't disconnect the tubes. I measured both drag link tubes last night. They are both the same length ~39 inches long. According to the parts catalog on this site, the right hand tube should only be 36 inches long. I think that somebody down the line has replaced the right side one with a left side tube. That would account for the extra length on the left side and none on the right. I'll order right one when I get home later today. Thanks.
 
You adjust the steering by centering the steering wheel. You then set the toe in per the specs. This creates the affect of each wheel tilting toward each other and makes the tractor run straight.
 

Ok, I got the right tie rod tube, and installed it. Jacked the front end up and re-centered the steering, and readjusted the tie rods. Same Problem. Shortened the right side all the way up and let out the left side almost as far as it would go. Same Problem.

What else could be causing the problem? The old steering box was leaking from every shim and seal, but at least it went straight. Could it be something inside the steering box? Front spindles? Bent axle? All look to be tight and OK. What angles should be on the pitman arms? The place where the left one connects to the tie rod is slightly toward the back of the tractor, and the right is slightly toward the front. I believe that on my other steering box they were both about vertical.

I'm at a complete loss to explain this behavior. I really need help, or at least some more suggestions.
 
(quoted from post at 17:29:10 10/06/14) Maybe the rebuilder did not get the left and right sector shafts "timed" correctly inside the box.

Could be the problem. How would I go about checking the timing on the steering box?
 
The steering box when disconnected from the drag links should have about 3-1/4 turns from left stop to right stop. Verify that, then turn it to the center position (slightly over 1-1/2 turns from either stop). When in this position, both the left and the right pitman arms will be pointing toward the radius rod caps on each side of the transmission. Both arms will be angled slightly rearward. If they are in that vicinity, the steering box is timed correctly. If one of the sectors was installed a tooth off (out of time), the pitman arms will be WAY off that position.
 
OK, now I feel stupid. When I centered the steering wheel, I remember going into the tool room to get a bigger wrench. Apparently during that time, my niece was playing with the steering wheel, and I didn't check it again after I came back. So the steering box is running to one side. I believe that is what is causing my problem. I was in the middle of fixing it today when the NWS called for a tornado warning, and I didn't get the job completed, but hopefully tomorrow I'll have everything fixed.

I'm sorry to have wasted the time of everyone who responded,, when it was my fault all along.
 

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