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Re: SOS Trans Work

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Author  [Modern View]

02-14-2014 16:36:14

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I have the manual and have read the manual.
The picking an experienced mechanic's brain part is what I'm doing here.... :P
Troubleshooting points to a defunct fwd band. Adjusting it does nothing and there doesn't seem to be any tension on the adjuster even screwed all the way in. I also have an intermittent rubbing/scraping noise from the forward end of the trans.
My conclusion is that either than band is broken or the link between band & adjusting screw or band and piston either broke or fell out. I think there's a decent chance the actual fix will be pretty easy, it's a question of how badly am I likely to screw something else up getting there, or find that the rest of the unit is so screwed up it turns into a huge mess.
The tractor has 4000 hrs indicated though I am unsure how accurate this is. It looks to be in good enough shape that they may be accurate. I serviced the trans, changed the filter and cleaned the screen and didn't see any evidence of major wear or problems so I think the unit is in good shape aside from the fwd band issue.

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02-14-2014 16:52:12

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 Re: SOS Trans Work in reply to jaluhn, 02-14-2014 16:36:14  
Again, which gears do not work?

Could be very simple.


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02-14-2014 17:07:39

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 Re: SOS Trans Work in reply to Dean, 02-14-2014 16:52:12  

Off the top of my head I do not recall exactly - I know R1 and about half the fwd gears, including 7 & 8 IIRC don't work. I do know that when we looked at the list and compared to the manual the commonality were that they all had the fwd band engaged.
On all of the malfunctioning gears, the tractor moves, but has little power.
I believe that I checked the hydraulic pressures on the trans and they were all within spec although I cannot exactly for sure.
The telling things to me are:

1) The failed gears all have fwd band applied in common

2) Failed gears seem partially working as if something is not completely applied or slipping

3) The fwd band adjustment has no resistance even screwed all the way in.

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Larry NCKS

02-14-2014 18:44:51

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 Re: SOS Trans Work in reply to jaluhn, 02-14-2014 17:07:39  
Not sure what you're calling the forward band. In SOS nomenclature, there is no such thing. There is Band 1, Band 2 and Band3.

Band 1 would be applied in half the ratios, to wit: R2, 3,4,7,8&10. In this scenario the direct drive clutch is released and the transmission is in an overdrive mode. If any of these ratios are functioning, B1 is not your problem.
R1 is a direct drive ratio whereas 7 & 8 are not. I'm guessing your memory on which ratios malfunction is not good and that you need to recheck it if you want good mechanical wisdom from us.
This post was edited by Larry NCKS at 18:49:22 02/14/14.

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02-14-2014 19:58:00

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 Re: SOS Trans Work in reply to Larry NCKS, 02-14-2014 18:44:51  
You are right, my memory is likely faulty as to which parts are which.
I am not asking for help troubleshooting as it has been established to my satisfaction that the forward most band (B1?) in the transmission is not applying and it is almost certainly due to a mechanical issue in the band or linkage. I believe this was concluded with help from this board.
My question is that assuming that the troubleshooting is correct, how likely am I to be opening a huge can of worms by trying the open this thing up to replace / repair the band? Based on the manual I think I can fairly easily pull the main parts out of the case to access the band, repair it and put it back together.... but I also know that what looks easy and straightforward in the book may or may not be that way in practice - hence asking for thoughts from those more experienced than myself.
That list of ratios posted does seem to match the ones I have that don't work.

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02-14-2014 20:08:30

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 Re: SOS Trans Work in reply to jaluhn, 02-14-2014 19:58:00  
Fair enough but I would not even think about opening it up without complete diagnosis.

As I said earlier, it could be a simple external fix but it is necessary to know what ratios are not functioning to diagnose.


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02-14-2014 20:16:48

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 Re: SOS Trans Work in reply to Dean, 02-14-2014 20:08:30  
Oh, of course. Had my share of problems that could have been fixed a much easier way to jump into major work without being sure. :lol:
I am 95% sure that list is correct for the ratios that are not working, and I recall narrowing it down with high confidence to a mechanical problem in that band - including testing hydraulic pressure to the servo IIRC.

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02-14-2014 20:00:19

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 Re: SOS Trans Work in reply to jaluhn, 02-14-2014 19:58:00  
At the moment neither the tractor or any of my manuals are readily accessible to me, hence the reliance on memory - I'm in the middle of moving, however I do have the time to research and plan what work I need to get done when I do again get a good place to tear stuff apart. This is why I don't have clearer more accurate info to post.

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