Maybe a bump on this very old thread,
but it was useful to me, as I just bought
a NH TC25D with super steer and sensatrac.
I have a TC33D that was just crushed by a
a falling tree in a wind storm.
Anyhow I wanted to know more about this
sensatrac. Instead of the 4wd lever going
into the transmission care, it goes by a
Morse type cable, to a box right before the
front axle.
NOTE THIS... On my transmission, it still has
the shaft sticking out where the regular, not
sensatrac model, would connect the lever and
linkage to the 4wd shift lever. It is locked in
4wd with a little angle iron bracket so the
shaft can not rotate. So trans fully in 4wd
and the front driveshaft always delivering
power.
So anyhow, best I can deduce, this sensatrac
is just a one way sprag (over-running clutch)
that can be shifted into lock-all-the-time if
wanted. There is no automatic. It is only the
one way clutch preventing drive line wrap up
torque. One shaft is spinning slightly faster,
and the one way clutch over runs, or if the
front wheels slip, then power from the trans
flows through the one way clutch to turn the
front wheels. I don't like to think of it is
automatic in the truest sense, it is just an
over running clutch to prevent drive line
wrap up torque when running on hard ground.
It sounds nice in advertising to say automatic
sensatrac and all that. But it is just an over
running, one way clutch that you can lock in
to transmit torque in both directions of need be.
So that may be to have all 4 wheels slowing
down the tractor when going down a slippery
hill in the mud, something like that.
So on my new (to me) TC25D, since it has this
4wd clutch shaft that sticks out of the trans,
(and it locked in 4wd), maybe I could take
the linkage off my parts tractor (that the tree
hit), and make the lever on my new tractor
truly disengage my 4wd. Maybe relocate the
Morse cable that locks the sensatrack and add
a lever over on the right side, next to the 3 point
up and down lever. That way I am able to turn off
the 4wd. Do I really need to turn it off? I think
it will save wear on front drive line components.
I know there will not be drive line wrap up torque
because of the sensatrac one way clutch, but I
really think I would like to turn off the 4wd and
also be able to lock the sensatrac one way clutch.
Any thoughts on this? Thanks.
-----Doozer
