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:

How do you adjust the seat tension?

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Mike CA

08-07-2007 23:35:39




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When I sat down on my H the seat immediately bottomed out. Now, I'm a big guy at 250 pounds, so I need do do something with it. Is the spring an adjustment I can tighten, or does it have to be replaced?



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IndianaRed

08-10-2007 06:17:33




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 Re: How do you adjust the seat tension? in reply to Mike CA, 08-07-2007 23:35:39  
So you got another one?



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john *.?-!.* cub owner

08-08-2007 20:19:36




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 Re: How do you adjust the seat tension? in reply to Dave H (MI), 08-07-2007 23:35:39  
If you take it apart, replace that vertical bolt also. I have known of a couple instances of them breaking. You don't fall off, but really gets your attention when the end of the bolt and nut pass your nose while you are falling the 3 or 4 inches before it bottoms.



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D Slater

08-08-2007 18:33:14




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 Re: How do you adjust the seat tension? in reply to Mike CA, 08-07-2007 23:35:39  
Mike from my early days on a farmall tractor, that was the only kind of seat I knew at the time. That bolt through spring should of had 2 jam nuts on it and they were tightened or loosen to adjust seat and would hold 250 pound. The sping actualy compresses very little before seat bottoms on platform so if you have a little gap between coils it may be enough. As cowman posted the pin and where it passes through pipe gets worn and if so will give a lot of side slop to seat. If very bad I weld a steel bushing thats sized right for pin into pipe, it doesn't show when mounted. If the mounting bracket holes for pin are bad I weld holes and redrill for pin. Also sometimes the spring adjusting bolt will wear into pipe on bottom side. 1-800-234-3280 sells new springs for your seat but cost 39.95

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Mike CA

08-08-2007 21:30:39




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 Re: How do you adjust the seat tension? in reply to D Slater, 08-08-2007 18:33:14  

D Slater said: (quoted from post at 18:33:14 08/08/07) Mike from my early days on a farmall tractor, that was the only kind of seat I knew at the time. That bolt through spring should of had 2 jam nuts on it and they were tightened or loosen to adjust seat and would hold 250 pound. The sping actualy compresses very little before seat bottoms on platform so if you have a little gap between coils it may be enough. As cowman posted the pin and where it passes through pipe gets worn and if so will give a lot of side slop to seat. If very bad I weld a steel bushing thats sized right for pin into pipe, it doesn't show when mounted. If the mounting bracket holes for pin are bad I weld holes and redrill for pin. Also sometimes the spring adjusting bolt will wear into pipe on bottom side. 1-800-234-3280 sells new springs for your seat but cost 39.95


Thanks D. Good info.

And thanks to the rest of you as well. I'll tear into the seat when I get the tractor and see what's up.

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Nebraska Cowman

08-08-2007 10:36:39




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 Re: How do you adjust the seat tension? in reply to Mike CA, 08-07-2007 23:35:39  
Nobody mentioned it but the hole in the pipe where the pin goes through may be worn oblong. That seat should support a 250 lb man but it never will ride comfortably.



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PatMz

08-08-2007 08:52:31




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 Re: How do you adjust the seat tension? in reply to Mike CA, 08-07-2007 23:35:39  
JimN is on the right track here. It's working as a second class lever, the resistance (spring compressing) is being moved by the effort (you in the seat), and the fulcrum is at the front of the mounting bracket. Moving the resistance closer to the effort will reduce the mechanical advantage.



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Mike CA

08-08-2007 08:26:39




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 Re: How do you adjust the seat tension? in reply to Mike CA, 08-07-2007 23:35:39  
Well, I could stand to lose a couple pounds.
I prefer the look of this seat to the others. My Grandfather had this kind of seat, so I'm partial to it. I'll try moving that spring back when I get the tractor and see what that does for me. I've never had a seat bottom out like this, so I'm not sure what the difference between it and the others is.



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Janicholson

08-08-2007 05:13:23




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 Re: How do you adjust the seat tension? in reply to Mike CA, 08-07-2007 23:35:39  
Two solutions:
Move the spring rearward in the bracket, giving more distance between the front pivot and the spring location. (I think there is a slot in the bracket, but a new hole might need to be drilled in the pipe at least 3/4" more rearward than the original hole for the spring bolt)
Or you can increase the strength of the spring.
That spring looks about as tight as it can get, so compressing it more might just cause it to coilbind (have the coils touch one another) coilbound springs do not spring, they are hard as rocks.
A heavier spring might work well, but is not stock looking. It would also need a biger top cup to locate it.
Getting a more modern seat with the tapered coil spring behind the pan (look at pics in photo gallery) would also be a great choice. SH seats are much prefered. With new bushings and a real shockabsorber, they are great. (no one but the correct police will care that it is not original because many were replaced and updated). Several springs of various rates are available for the newer seat, and they can be flipped over to protect the cushion from sun. JimN

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georgeky

08-08-2007 08:51:49




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 Re: How do you adjust the seat tension? in reply to Janicholson, 08-08-2007 05:13:23  
Jim, I think one spring is all that is available now days for the new style seat. That is all I have found anyhow. It is a stiff one. Mike is like me at 250+ he will need a stiff one. They did come in various strengths for varying operator weights, but I am pretty sure that one is it now days. You are right that newer seat is head over hills better than the others



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Janicholson

08-08-2007 11:27:49




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 Re: How do you adjust the seat tension? in reply to georgeky, 08-08-2007 08:51:49  
One of the regulars on here indicated the availability from a source of the stiffer springs. I can't remember who, but it was a year or so ago. A coil over the original shock on that type seat also works nicely. JimN



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georgeky

08-08-2007 11:47:36




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 Re: How do you adjust the seat tension? in reply to Janicholson, 08-08-2007 11:27:49  
Jim, there could be different strenghts available from after market sources, I don't know. One is all that is available from IH now days and it is the heavy duty model for us round fellows. I put a couple new ones on tractors a few years ago and they are too stiff and I weigh over 250. The M that dad gave me has one of the lighter duty springs on it and I am quite a load on it.



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Doug N

08-08-2007 01:17:48




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 Re: How do you adjust the seat tension? in reply to Mike CA, 08-07-2007 23:35:39  
I'm thinkin you'll need a heavier spring. If it is bottoming out now, adjusting it won't do anything, it'll still bottom out. Takes the same amount of pressure to bottom out a spring whether it's at half length, or at 3/4 length, or at full length. Doug N



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Janicholson

08-08-2007 05:46:30




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 Re: How do you adjust the seat tension? in reply to Doug N, 08-08-2007 01:17:48  
WIthrespect, all springs (with very few exceptions)have spring rate. This is the amount of increase in tension/compression that occurs for every mm, or fraction of an inch it is stressed. That spring on mikes tractor will get stronger when "tightened" BBBuuutt it may be already so tight that it coilbinds when mike is in the saddle. (Mike could put a feeler gauge .002" between the coils when sitting on it to see if it is. If not tightening the nut would be in the right direction.
Again with respect, if springs acted like you indicate, cars would bottom out when anyone got in. Springs do get stronger as they are compressed or stretched. JimN

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Doug N

08-08-2007 15:11:41




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 Re: How do you adjust the seat tension? in reply to Janicholson, 08-08-2007 05:46:30  
Jim, Yes I know that. What I was getting at is: Say a spring takes 300 lbs to fully compress it. Say the spring's free length is 16". So if the spring is at 16", 300lbs can compress it fully, if the spring is at 10" it still takes 300 lbs to fully compress it.

You can't put 400 lbs on that spring and expect to adjust it almost all the way down and expect it not to bottom out. I know that springs get stronger when compressed, but they still have a maximum rating before they will bottom out.

I probably should have worded it better this morning. Doug N

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Janicholson

08-09-2007 12:49:11




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 Re: How do you adjust the seat tension? in reply to Doug N, 08-08-2007 15:11:41  
I now get (and agree with) your thinking. The point I was making was that is the spring was not bottoming, but the seat tube was hitting the platform, the spring would not be coilbound, and as such could be tightened till coil bind happened at the same position as the tube on the platform, getting every bit of compressive resistance out of the spring. JimN



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Pat-CT

08-08-2007 00:51:27




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 Re: How do you adjust the seat tension? in reply to Mike CA, 08-07-2007 23:35:39  
i dont have that style seat but if you tighten that nut right there i think it will adjust it



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GeneMO

08-08-2007 07:58:22




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 Re: How do you adjust the seat tension? in reply to Pat-CT, 08-08-2007 00:51:27  
Mike, If you can find one, and decide to switch to the other style of seat, I have a "new, old stock" spring, still has the original tag on it.

I have never had one like you have, but like others said, see if there is a hole farther back, or try tightening it up a little.

Notice no one told you to loose weight. We are a polite bunch here.


Gene



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GordoSD

08-08-2007 16:34:11




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 Re: How do you adjust the seat tension? in reply to GeneMO, 08-08-2007 07:58:22  
GeneMO. Would you look at that spring and tell us if there are one, two , or three notches in the very last (top) coil?

Gordo



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