856 and the ta

madrid

New User
Put in a new clutch pressure plate etc. because when the clutch was released it would start to move then slip and engage. Well it wasn't the clutch. TA works in direct but does the same slip then engage. Won't even move in TA. Starts then just quits. Pressure is just about 300 lbs. but when I push the clutch in it never dumps stays the same pressure . The dump valve is adjusted by the book specs. The red light will go out when the clutch is released, but seams to take a while. It doesn't slip in direct once it is moving. Steering is good pressure over 1800 lbs. Any ideas??
 
The TA has a sprag clutch in it to lock the carrier to the main casting when the TA is pulled back/engaged. The sprag clutch allows rotation with the engine and denies it opposite that. The rear locking clutch in the TA is only intended to prevent the free wheeling associated with the earlier TAs in the small series tractors (SMTA on up). If that "one way" clutch is bad it will act just like it does in your case. If it is used like that the rear locking clutch will be toast (if it isn't already. Jim
 
Others may know for sure about reliability when the sprag is out. I think it depends on the condition of the MCV pump, dump valve, and remaining life in the rear lockup clutch. If it was not run slipping very much, it might be long lived. Jim
 
Well by the BOOK is only good when they are new , and how did you run the pressure tests?? as to how long the direct side will work there is no way of telling as it could last for years and it could drop kick ya tomorrow . For dump valve adjustment on a OLD tractor that has wear everywhere look back in the archives on how i do them as i have covered this over and over many times . What you are getting is a double shift if the low side was working . BUT since the low side is OUT it stops . and WHY is the lock up pressure set so high ?? even on a turned up cranked up 1486 i have never went above 275-285 , on a 856 245-260 is more then enough. when ya get to high you can literately blow the MCV off into the next field. and it so much fun repairing the threads in the bolt holes .
 
The plug on the side of the cover under the dump valve adjuster. I think it was ord #5. At idle and then with the steering locked one away for the 1800 lbs. I never adjusted any pressure, that's the way it was.
 
We ran a 1066 in direct for about 5 years before we sold it. As is of course. Told the guy that TA was bad and he ran her a couple of years before having a new TA put in it. We used it in field work, pulling a Hiniker field cultivator a 25 ft. disc. and a 7 shank chisel plow. We were not going super deep with any of them...............Kenny
 
The real structural component in this case is probably the sprag clutch. If the locking clutch (rear) is still sealed, and it is not used, the front TA power clutch pack
will not be more or less prone to fail. The locking clutch will not begin to pull a load. and if left in direct, nothing wears that is not already worn. Not a flame,
just experience and wisdom from The Tractor Vet and others on this Forum. jim
 

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