T0-35 hydraulic lift question.

Jeff Eubanks

New User
Heres another T0-35 question. When the clutch is pushed in the hydraulic lift drops. I’ve been told there could be a problem in the hydraulics located under the seat. Anybody had this problem?? And if so was it a big deal $$$$$ or just simple replacements. Really looking at this tractor close before I put any money on the table...
 
How fast does it drop? Creeping down is normal, but going down in a few seconds is not.

A couple things to check, the lift cylinder seals and the stand pipe orings. In order to check you'll need to remove the round inspection cover on each side, just below the seat. If you can head the tractor downhill a little you won't lose any oil.

With the engine running and the lift raised, look up inside the case with a flashlight, under the seat. You will see the lift cylinder there. If there is oil pouting from the back end of the cylinder, the seals are bad. Could be as simple as replacing the seal rings, or bad as needing a new cylinder.

Also there is a tube called a "stand pipe". It connects the hydraulic pump to the lift cylinder. It will be to the front of the right cover. There are orings top and bottom. Oil coming down from the top or swirling around the bottom is a sign of blown orings, easy fix, BUT! Don't reach down in the oil with the engine running! It will get you!

If the lift goes up and holds steady with the engine idling, that's a sign of a healthy pump. If it's jerky the pump will need to be repaired or replaced with a rebuilt unit.
 
If you mean it drops right away with an implement
like a road scraper, etc., and by right away I
mean in just a few seconds, then it is leaking
fluid. If it lifts ok, the pump is probably ok,
but either the cylinder is leaking or perhaps the
standpipe O rings are leaking, or both. Replacing
the O rings is easy. Rebuilding the hydraulic
cylinder is not too difficult but more involved
and requires removing the top cover. You will
want to get a shop manual if you don't have one.
 
(quoted from post at 19:24:54 11/28/14) If you mean it drops right away with an implement
like a road scraper, etc., and by right away I
mean in just a few seconds, then it is leaking
fluid. If it lifts ok, the pump is probably ok,
but either the cylinder is leaking or perhaps the
standpipe O rings are leaking, or both. Replacing
the O rings is easy. Rebuilding the hydraulic
cylinder is not too difficult but more involved
and requires removing the top cover. You will
want to get a shop manual if you don't have one.

It will drop if you push the clutch in while the motor is still running. It sounds a little weird. But that's whats happening.
 
Yeah, that's a problem. It's leaking fluid inside
somewhere, cylinder, stand pipe, or both, as we
have said already. You need to look inside
through the right side hole while it's running,
don't put hand inside, and determine where the
leaking is, go from there, as mentioned already.
If you remove the top cover, it is heavy, tough
for one person, a rolling lift arm is very
helpful, especially putting it back.
 
Well friends, I am about to go through this same process. I have a 1955 TO-35 that does the same thing. The three point lift is amazingly strong but sinks down as soon as I step on the clutch. I have owned the tractor since 2007 and have taken excellent care of it (former auto tech by trade). I drained and filled the tranny with new GL1 90W two years ago. I do alot of bush hogging in the summer and plowing snow with a grader blade in the winter so a strong 3 point lift that doesn't instantly sink down is a must. So, first step is to take off those plates and look inside for leaks?
 

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