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Farmall 806- torque converter/amplifier or compression probl

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Placer

08-20-2007 19:40:22

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I am looking at purchasing a Farmall 806 from the neighbor. I have not run it yet but he describes it having trouble "holding back" when going downhill. Says he has to ride the brakes to keep it at a reasonable speed. Other then that the tractor runs great and works hard. What could this possibly be? He was thinking it was the torque amplifier, but it sounds like it could be a compression problem to me?
Any thoughts are much appreciated.
John

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Ted in NE

08-21-2007 16:24:22

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Re: Farmall 806- torque converter/amplifier or compression p in reply to Placer, 08-20-2007 19:40:22

Make sure the TA selector valve linkage is properly adjusted. With lever back for TA low side the valve should be all the way up. With lever ahead for direct valve should rest on the snap ring on the valve spool. The linkage wears over time & could just need readjusted

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dwag

08-21-2007 10:36:32

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Re: Farmall 806- torque converter/amplifier or compression p in reply to Placer, 08-20-2007 19:40:22

Check DD and TA press's., feeder tube o-rings. I had a 706 "freewheel" after installing a new TA, "went through" the MC Valve and fixed the problem. Don't know what was wrong, but tractor is still running after 20+ years. Worth looking into before "slapping in" a TA.

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Bob

08-21-2007 10:18:19

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Does it have a working tach? in reply to Placer, 08-20-2007 19:40:22

Does it have a working tach?

If so, it shouldn't be to tough to figure out if the engine is speeding up or the T/A is "overrunning".

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Bob

08-21-2007 10:19:59

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Correction.. in reply to Bob, 08-21-2007 10:18:19

Add an extra "o" where needed. (TOO tough.)

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caterpillar guy

08-21-2007 06:14:12

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Re: Farmall 806- torque converter/amplifier or compression p in reply to Placer, 08-20-2007 19:40:22

I don't know what all this nonsense is about a diesel and not holding back on a hill you guys must be going down mountains or something.I've got the 806D that I bought used in 1978 and it will hold you back on down hills unless your in road gear or going down a mountain. There is some push from the load but unless your pulling an enormuos load like the bigger self unloading wagons or a semi trailer and such it will hold back just is in relation to the load like your hay mower yes it will. Mine does not have a TA and have not missed it.

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Placer

08-21-2007 04:51:12

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Re: Farmall 806- torque converter/amplifier or compression p in reply to Placer, 08-20-2007 19:40:22

Thanks for all of your help guys I appreciate all of the insight. What I am gathering is that the 806 diesel never really "holds you back" while going downhill, TA or not. So it may just be an inexperience operator giving me his opinion on how it runs. If the TA is bad, I can still run the tractor without it engaged? Basically, I'm trying to find something to get thru one more cutting of hay an then I'll have the time to do a rebuild, new TA etc. Thanks again.

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Allan In NE

08-21-2007 05:39:00

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Re: Farmall 806- torque converter/amplifier or compression p in reply to Placer, 08-21-2007 04:51:12

I wouldn't be that concerned about the T/A for what you want to accomplish.

However, if it is a gas engine, be aware that they drink fuel like crazy!

Allan

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Allan In NE

08-21-2007 05:41:18

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Re: Farmall 806- torque converter/amplifier or compression p in reply to Allan In NE, 08-21-2007 05:39:00

Whoops!

Brain still in "sleep" mode. Should have read your other replies. :>)

Allan

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chuck46

08-20-2007 21:52:47

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Re: Farmall 806- torque converter/amplifier or compression p in reply to Placer, 08-20-2007 19:40:22

Hi, It may not be a bad TA, if it freewheels with the TA back check if the transmission oil light is on. I think on an 806 it is combined with the engine oil light, if it stays on the dump valve is hanging up. They are cheap to clean or replace and if you are lucky the TA may still be good. Good luck, Chuck

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the tractor vet

08-20-2007 21:38:28

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Re: Farmall 806- torque converter/amplifier or compression p in reply to Placer, 08-20-2007 19:40:22

First off i have a 806 diesel and when going down hill the engine will not hold you back as unless you have a Jake Brake on a diesel they do not have the back pressure for the hold back like a gas . Now if it is indeed freewheelen when the T/A lever is pulled back into the low side of the T/A then it will need a new T/A instaleed , Now The T/A was not ment to be used as a means of braken and if used as such you will have a failure of the T/A unit . When the T/A is installed CORRECTLY and every step is done BY THE BOOK a T/A will last a vary long time . IF it does not then either it was not installed correctly the first time or someone is abusen it . Of all the T/A's that i have installed over the 19 years that i had my shop open NOT one has ever failed and some of the guys are shell we say a tad rough on there tractors . The first one that i installed was in 83 on a 1066 and it is still going strong. So it is like this if ya don't know about them then find someone that does and have him check it out as tryen to figure out what is wrong at the other end of the wire is hard . And believe me i do know my IH's Heck even and empty haywagon will shove my 806 down a hill and have to use the brakes to hold it back and here in a few short weeks if ya think and empty haywagon can shove ya wait till ya latch onto a loaded 18 foot silage wagon with 21-26000 lbs shoven ya as the wagons weigh twice what the 806 weighs and i will never ever think of pullen the T/A while going down our hills wih a wagon behind.

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MIKE FRENCH

08-20-2007 20:48:25

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Re: Farmall 806- torque converter/amplifier or compression p in reply to Placer, 08-20-2007 19:40:22

Note, there is a anti free wheel clutch on the low side of a hydraulic ta. TA will work except will free wheel. Need to replace the TA to fix problem and if do be sure to put in a new MCV pump. Had 706 that had this prob and used it for years. Put several TAs in as I run a repair shop.

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Placer

08-20-2007 20:17:42

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Re: Farmall 806- torque converter/amplifier or compression p in reply to Placer, 08-20-2007 19:40:22

Thanks for the quick reply....

The tractor is an diesel. So if I am understanding this correctly (please bear with me as I am not experienced in the TA system).....when the TA is in high gear...it will help to slow the tractor when the engine power is reduced? Is it common for these models to "freewheel" while going downhill? Should I completly rely on the brakes or will the engine RPM's help to keep the tractor in check?

Thanks again.

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K.B.-826

08-20-2007 20:42:21

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Re: Farmall 806- torque converter/amplifier or compression p in reply to Placer, 08-20-2007 20:17:42

The TA was an optional transmission attachment that gives you two speeds in each transmission gear. It can be shifted on the move, under load, without depressing the clutch pedal or otherwise interupting the flow of power from the engine to the wheels. When the lever is in the forward position, the unit is in direct drive, there is no reduction. When the lever is pulled back, the unit is in TA, and there is about a 33% reduction in gear speed. This of course gives you more pulling power. When you get through the tough spot, you throw the lever back ahead to increase your ground speed. The TA's used in the smaller tractors with the 5-speed transmission (Super MTA, 300, 400, 330, 350, 450, 340, 460, 560, 660, 606, 544, 656, 666, 686) are the mechanical type and will freewheel downhill when the lever is in the rear position. The hydraulic TA in your 806 should not freewheel, but it is doing so because someone did not know how to operate it and fried the brake pack.

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Armand Tatro

08-20-2007 20:12:56

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Re: Farmall 806- torque converter/amplifier or compression p in reply to Placer, 08-20-2007 19:40:22

The TA in the farmalls from SMTA to at least 1466 models will freewheel (coast) when the TA is pulled-back(under-drive). It will not slow the tractor. Need to use brakes. In direct-drive(TA lever pushed ahead) the tractor will slow when engine speed is reduced but you will still need to use some brake for a complete stop. Also I don't think you said whether this was gas 0r diesel. A diesel engine will not slow a tractor as much as a gas engine will. This is most evident in the big truck engines. No somebody can expand on this information. Armand

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K.B.-826

08-20-2007 20:26:30

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Re: Farmall 806- torque converter/amplifier or compression p in reply to Armand Tatro, 08-20-2007 20:12:56

806 TA should NOT freewheel at all. If it does, it is junk, the low side brake pack is fried and the unit needs to be replaced. The mechanical TA's will freewheel when the lever is back. Remember, if the tractor has the 5-speed transmission, it has the mechanical TA. If it has the 4-speed with high/low or the 3-speed with high/low, it has the hydraulic TA which should NOT freewheel.

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Placer

08-20-2007 20:30:46

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Re: Farmall 806- torque converter/amplifier or compression p in reply to K.B.-826, 08-20-2007 20:26:30

So the 806 can freewheel if it is a mecanical TA? If the low side brake pack is fried what kind of repair are we looking at? Thanks for your help.

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Kevin Meier

08-21-2007 14:06:54

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Re: Farmall 806- torque converter/amplifier or compression p in reply to Placer, 08-20-2007 20:30:46

You don"t want to replace just the clutch pack parts on a t/a that is worn out. If that"s what"s wrong. Usually when a t/a goes bad it"s got worn sprag. The sprag is what keeps the tractor from freewheeling down hill works kinda like a brake on a bicycle. There are also 3 seal rings that ride in a bushing 1 for t/a 1 to split the t/a from the direct drive and 1 seal ring for direct drive. When they wear out they usually wear the ring glands on the shaft also. Which means if the t/a is bad replace the entire t/a not just pieces. If you have any questions feel free to email me about replacement parts or rebuilds.

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K.B.-826

08-20-2007 20:44:45

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Re: Farmall 806- torque converter/amplifier or compression p in reply to Placer, 08-20-2007 20:30:46

806 never had a mechanical TA, those were only used on the smaller tractors. You can either just leave the lever in the forward position at all times, or you can relace the complete unit. To do so, you need to split the tractor in two spots. Not a job for the do-it yourselfer.

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