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Farmall & IHC Tractors Discussion Forum
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T/A on 686 doesn't work

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Mark in C.C.

07-17-2007 18:34:40




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I just bought a 3000 hour 686 a few weeks ago. I've put about 20 hours on it cutting hay and baling. Today all of a sudden the t/a quit working. When you pull the lever back nothing happens. It continues moving at the dd speed. It also seems to shift out of gear harder now. Is it out of adjustment or is the t/a wrecked already? This is really disapointing because I really like the tractor otherwise. Any ideas what could be wrong? Thanks, Mark

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Owen Aaland

07-18-2007 04:45:51




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 Re: T/A on 686 doesn't work in reply to Mark in C.C., 07-17-2007 18:34:40  
Hold the clutch down with TA lever forward. Start to move the TA lever back. You should feel a little free travel and then start to release the TA clutch. That is how it should normally feel. If this is not what you have, check the linkage adjustment. If the adjustment has not changed, but you have too mach free travel, have probably have a failed release bearing. A bearing failure will burn the fingers and will change the free travel.

If it still feels right, and the adjustment is OK, the problem is is inside the TA housing. You can take the stamped steel cover (four bolts) off the top of the housing to inspect the TA clutch. A pivot pin coming out of a lever will not change the free travel but the clutch will not release. With the main cltch pedal blocked down and the transmission in neutral you should be able to rotate the assembly in the direction if engine rotation to inpect it. With the TA lever back he TA clutch disk should have a few thousands of an inch clearance. The disk should be able to wiggle a little bit between the flywheel and pressure plate if it is released. If it is not free you have a TA clutch problem. If it is loose, but will not turn independent of the flywheel, then the problem is with the planetary gears.

Seized planetary gears will act the same as out of adjustment TA linkage when it comes to shifting.

A TA clutch problem can be repaired, depending on what is wrong, either through the inspection cover or by splitting the tractor at the main clutch. Planetary problems will require removal of the clutch housing from the tractor and a major TA rebuild.

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Allan In NE

07-18-2007 03:15:28




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 Re: T/A on 686 doesn't work in reply to Mark in C.C., 07-17-2007 18:34:40  
Mark,

These guys have all given you good advice.

Could be anything from a simple adjustment to a welded planetary. However, that "hard shifting" symptom is pointing at clutch adjustment.

Don't be discouraged. That 686 is one heck of a nice tractor and is worth the cost of repair, no matter what the cause.

Allan



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Kevin Meier

07-17-2007 18:59:43




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 Re: T/A on 686 doesn't work in reply to Mark in C.C., 07-17-2007 18:34:40  
It's probably as the tractor vet said. Your t/a clutch needs adjusted or the levers are worn out. If it were the t/a it would more than likely slip a little on the t/a side more than just quit doing it's job all together. If you need the t/a clutch or t/a feel free to shoot me an email. And just curious what does the tractor vet do? tractor mechanic or just a tractor specialist. You seem to be a very wise man and I learn a lot by reading your replies to people. Just wanted to let you know you help a lot of us out and we appreciate it.

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Kevin Meier

07-18-2007 13:55:04




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 Re: T/A on 686 doesn't work in reply to Kevin Meier, 07-17-2007 18:59:43  
I got to thinking about your problem today and came up with the problem as being in the t/a. The t/a clutch turns the t/a at a 1 to 1 ratio giving you the diresct drive side. Now the t/a side comes from the ramp area in the lower part of the ta which means it can't be the t/a clutch. Hope this helps you out. Amazing what you think about when I'm building the darn things. Good luck



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the tractor vet

07-17-2007 20:18:49




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 Re: T/A on 686 doesn't work in reply to Kevin Meier, 07-17-2007 18:59:43  
Well for 19 years i ran a business fixen tractor and spec. in the red ones as it was my favort flavor along with buying a selling tractors and equipment . Just loved the dead row tractors from one sale that i use to go to and would be the one with his hand up when they called bad T/A as i was all over that one , everybody has there thing and mine was installing T/A's . So what i know about Farmalls is self taught and learned from the school of hard knocks and also talken to old I H mechanics over the years . Plus every chance i got to go to a sale and by I H shop tools and equipment i went and spent . At one sale i bought 90% of all the shop tools and equipment Two full truck loads stacked to the top of the cab roof on a oneton with a 10 foot flat bed. And over the years i have had every nut and bolt out on most of the farmalls from the letter seires thru the 86 seires . All of my farmer buddys are farmen with tractors and equipment that they bought off of me . even though i closed up shop 5 years ago i still take care of there tractors.

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the tractor vet

07-17-2007 18:50:21




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 Re: T/A on 686 doesn't work in reply to Mark in C.C., 07-17-2007 18:34:40  
Get the book out and do a clutch and T/A adjustment .



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Mark in C.C.

07-17-2007 19:02:39




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 Re: T/A on 686 doesn't work in reply to the tractor vet, 07-17-2007 18:50:21  
My owners manual doesn't say how to do it. do I need a service manual? Will an adjustment solve the problem?



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the tractor vet

07-17-2007 20:45:04




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 Re: T/A on 686 doesn't work in reply to Mark in C.C., 07-17-2007 19:02:39  
For this one ya had best get a book for you to understand how this one is done as it is not as easy for me to explain and ya have to fallow it step by step . I would guess that the lock bolt slipped at the T/A release lever .



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Kevin Meier

07-17-2007 19:29:50




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 Re: T/A on 686 doesn't work in reply to Mark in C.C., 07-17-2007 19:02:39  
If it were mine I would probably take it apart and get a good look at the t/a clutch and ta and go from there. The ta clutches have 3 levers that are normally burnt completley off at the ends. It could possibly be the ta but if the ta side is completleny gone the ta would have to have broken sungears, topshaft or the rollers and bottom end of the carrier are shot. Good luck.



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