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Ford 120 Hydo Wont Move

hydrostatic ford jacobsen transmission

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#1 Ford100120 OFFLINE  

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Posted August 08, 2012 - 12:04 PM

Hello all,

I have a Ford 120 lawn tractor 67 so this one was built by Jacobsen.

I can not get tractor to move forward or reverse.

The diff lock is set at on postion.
New Filter New Fluid New belt. Tried purging

Push control forward the transmission put a load on engine. This is forward and reverse.

Belt installed per the manual.

Here is my concern. With the transmission in lock position it still free wheels. Don't think should be doing this.

Has Sundstrand 90-2029.

Any one have any other ideas? Is transmission a goner?

#2 olcowhand ONLINE  

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Posted August 08, 2012 - 02:26 PM

If the hydro loads the engine, then there must be something in the final drive locking things up. Almost always when a hydro goes bad, it won't load the engine hard, only a light load. Can you post some pics of the hydro & rear differential? I'm not familiar with the older Fords.

#3 Guest_rat88_*

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Posted August 08, 2012 - 03:26 PM

Have you seen this operate in the past or is it a new (to you ) tractor?
Has it been sitting for more than a year without being moved under its own power?

#4 coldone OFFLINE  

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Posted August 08, 2012 - 05:28 PM

Sundstrand 90-xxxx is a version of the 15 series hydro.

If the hydro is loading the engine and squelling, then something is stopping the wheels. Possibly a brake that is jammed or worst case problems with the rearend.

#5 Ford100120 OFFLINE  

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Posted August 08, 2012 - 05:43 PM

Thanks for the responses

I will try figure out how to load photos of it.

Yes tractor is new to me. It was partially tore down. Previous owner had past away. So I got no info on it.

But transmission engine frame was all together. Mostly cosmetics I had put back on. Front cowl. Linkages and Generator carb.


There is a small wheel (pully) that brake band goes around. If it is jacked off the ground how should this function. If i spin tires should this pully also turn as wheels turn.

What I see is

Turning rear wheel it does not spin much at all. But when i spin it and the stop it begins to spin.

Not sure if that function is correct.

Also load on motor. Its not a large load just bring tractor down just a bit. Almost think what you would expect.

#6 Ford100120 OFFLINE  

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Posted August 08, 2012 - 05:50 PM

Brake is not jammed it free wheels. And no squealing. Cant say for sure sound. Cause never owned one of these. Best description can give sound like fluid is rushing threw it. I would guess it sounds normal.

#7 Guest_rat88_*

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Posted August 08, 2012 - 06:41 PM

check for keys in the back wheels (hubs). Sometimes these dont get re installed when wheels are pulled, some times intentionally removed to make the hydros easier to push. they could be sheared too

With both rear wheels off the ground, do both tires turn if you spin one?

Edited by rat88, August 08, 2012 - 06:44 PM.


#8 Ford100120 OFFLINE  

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Posted August 08, 2012 - 06:59 PM

Both tires turn do turn. I thought this would rule out the key not being in.

Not so?

#9 Guest_rat88_*

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Posted August 08, 2012 - 07:11 PM

mostly. Try putting a little drag on the "free" wheel.
Brake disc speed should be tied to wheel speed. If the wheel stops, the brake disc should stop at the same time.(one wheel should be on the ground to test this)

Edited by rat88, August 08, 2012 - 07:14 PM.


#10 Ford100120 OFFLINE  

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Posted August 08, 2012 - 10:17 PM

Brake wheel spins and stops with rotation of tire. With one wheel on ground.

#11 Guest_rat88_*

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Posted August 08, 2012 - 10:38 PM

Sorry for playing 20 questions, just trying to cover the easy stuff first.

Is there a chance that the by pass valve is stuck?

#12 Ford100120 OFFLINE  

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Posted August 08, 2012 - 10:44 PM

No problem at all I thankful for help. Ask away.

That was one of the things I messed with as well.

It was real hard to move. I shot some PB Blaster on it. And it moves easy now.

Do these go bad? Does it pull out of transmission to check?

I did take handle off and nut that secures it to transmission when shot PB in there.

But that is as far as I went. Not sure what I would get into if I went any deeper

#13 Guest_rat88_*

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Posted August 08, 2012 - 11:41 PM

It is just a dump valve. they will get rusty and hang up. I cant remember for sure , but I think there is an O ring or 2 in it that will leak and you will lose a little pulling power and/ or piss on the floor. That shouldn't be causing your problem, unless it is making the plunger stick.

#14 Ford100120 OFFLINE  

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Posted August 09, 2012 - 07:25 AM

Do you think should pull it out and take a look at it. Or something else?





Also tagged with one or more of these keywords: hydrostatic, ford, jacobsen, transmission

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