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Farmall & IHC Tractors Discussion Forum
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What does it really mean when a TA slips

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Brianbws

01-31-2005 08:15:44




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Hey guys, I'm looking at a 300 that has a TA that slips in low. What does that really mean? Is the tractor still workable, but only in the high range? Would that ever really be a problem for light use, ie; moving snow, post hole drilling, moving hay wagons and such? Thanks.




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Brianbws

01-31-2005 21:29:56




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 Re: What does it really mean when a TA slips in reply to Brianbws, 01-31-2005 08:15:44  
Thanks to everyone that posted. I always get very usefull information. Now I guess it's just up to dealing on the price. Thanks guys!



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Darald

01-31-2005 20:25:12




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 Re: What does it really mean when a TA slips in reply to Brianbws, 01-31-2005 08:15:44  
Good explanation on the 350. Lets now try to explain why the 986 works in low but not in high.
Thanks



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Allan in NE

02-01-2005 05:36:20




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 Re: What does it really mean when a TA slips in reply to Darald, 01-31-2005 20:25:12  
Hi Darald,

That one sounds like the main clutch is out.

Allan



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Darald

02-01-2005 06:16:16




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 Re: What does it really mean when a TA slips in reply to Allan in NE, 02-01-2005 05:36:20  
Good morning Allan;
I guess that makes sense. The 986 can be driven all day in low, and the only time you can nurse it into high is on a down slope with the throttle. It will last in road gear as long as you are on the level, come to an incline and the response feels like the clutch slips and it gradually slows down. The repair sounds like a new TA unit.



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farmaljim

01-31-2005 11:32:30




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 Re: What does it really mean when a TA slips in reply to Brianbws, 01-31-2005 08:15:44  
If in low it is quite it will last a very long time if it clunks then it also could have a problem with the pto also . Make sure it has oil (hytran) or equiv. Adjust it then if it slips and doesent clunk dont use it and it will probably last many years. I used a super MTA for 14 years like that till I wanted to sell it than rebuilt it and sold it..



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Jimmy King

01-31-2005 10:58:57




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 Re: What does it really mean when a TA slips in reply to Brianbws, 01-31-2005 08:15:44  
I have a 460 that the TA has been out of for years I just disconected it.



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Dave_Id

01-31-2005 10:52:41




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 Re: What does it really mean when a TA slips in reply to Brianbws, 01-31-2005 08:15:44  
One other thing not mentioned, be sure they are running hydraulic oil in the tranny. The TA won"t work if gear oil is run in it.



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captaink

01-31-2005 09:39:00




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 Re: What does it really mean when a TA slips in reply to Brianbws, 01-31-2005 08:15:44  
The 300 has the planetary carrier type of TA. If it slips in low, the over-running clutch (sometimes referred to as a ramp & roller clutch) is developing problems (probably flat spots on the rollers) and is not preventing the planetary carrier from rotating backwards. I do not know of any reason (maybe someone else does) that it won’t work for a long time in hi (or the direct mode) especially under the types of loads you mention. A lot of old farmalls were run for years with the low side of the TA “out.”

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Carp

01-31-2005 09:36:55




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 Re: What does it really mean when a TA slips in reply to Brianbws, 01-31-2005 08:15:44  
The T/A will not "Slip" in low range. It either works or it does not. The commom problem with a T/A is that the over running cluth (ramp and roller or sprags depending on which type it is) does not engage when you pull the lever back into low range. When this happens, the planet gears are not held stationary around the sun gears and the carrier counter rotates around the sun gears instead of driving the output sun gear. When the T/A is in low range, the friction clutch is actually disengaged.

On the high side (direct drive) the friction clutch is engaged. This drives the carrier and the planet gears at the same speed as the input sun gear, which in turn drives the output sun gear at the same speed (hense direct drive.)

If the low side of the t/a is out, but the high side holds and works fine you can use the t/a without any fear of the t/a further damaging itself. The only case this would not be true is if there is gear damage on the sun or planet gears.

If the t/a just makes a whirrrring sound (similar to a clutch slipping) then it should be ok. If you hear nasty gear noises, that probably means that the sun and planet gears are damaged as well. In that case you will most likely loose drive in high and low range eventually and have to replace the entire t/a.

Sorry for the long post and hope it helps.

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RustyFarmall

01-31-2005 08:51:00




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 Re: What does it really mean when a TA slips in reply to Brianbws, 01-31-2005 08:15:44  
It slips in low: Would be similar to you holding the clutch pedal part way down so that the clutch is not fully engaged. Quite a few of these old tractors have TAs that do not work on the low side. Just leave it on the high side and you should get along just fine. Eventually that TA is going to need some work. If you purchase the tractor, the first thing you need to do is get the proper manual and adjust the clutch and the TA according to specs.

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Novel Idea Guy

01-31-2005 08:39:25




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 Re: What does it really mean when a TA slips in reply to Brianbws, 01-31-2005 08:15:44  
In a nutshell, it means that it slips in low. The TA needs to be replaced soon. It will work for a while in direct, but eventually the tractor won't go at all.



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