Re: farmall 666 w/ hydro trans lurching ???

Posted by Allan In NE on June 04, 2006 at 05:50:30 from (148.78.243.24):

In Reply to: Re: farmall 666 w/ hydro trans lurching ??? posted by maplehillfrm,pat on June 03, 2006 at 22:19:17:

Pat,

Replace both filters; the spin on, on the left side of the tractor and the round one inside the cover on the right.

If the tractor will "move" any at all, there is hope, although we might start to see some money spent in valves, regulators, etc.

I honestly believe that 90% of hydro repairs are done needlessly by a lot of shops; they throw in a new transmission 'cause they really don't understand how they work. The units just simply are not all that complicated.

There are three "high dollar" items. The charge pump (which almost NEVER goes out) and the two servo motors. Now, if someone tried to pull start the tractor, the motors have been starved for oil, they are toast and the transmission is not worth fixin'.

Otherwise, we can find your difficulty by using the process of elimination. The main thing is, we've got to have oil/pressure.

I re-emphasize that little "Foot-n-Inch" valve. It cannot leak in order for the tractor to move. Because, by it's design, it dumps the pressure (to stop the tractor). It is nothing more than an oversized needle/seat valve just like in a carburetor. Over time, the clutch linkage gets sloppy and out of adjustment. So, that guy is the first order of business to look at.

If, on the other hand, the tractor will move both directions for the first few minutes when it is cold and then gets progressively worse as the oil heats up, I think we have valve issues (very common ailment).

Allan

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