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Rear end problems!!! Differential and transmission overhaul


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#1 DeVId OFFLINE  

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Posted July 30, 2011 - 10:25 AM

Hi
i've started a pretty big project for my 1979 GT16

Oil was leaking from pretty much every seal so i've decided to overhaul the whole sundstrand transmission and differential seals, bearings and gaskets. The rebuild is now done, i've just filled up with oil and started the engine....

I know you're all guessing what's next... nothing works lol either the hydraulics or whells won't work.

If any of you ever done this type of project please give me hints of where to look.

Thanks a lot

Model No. 931010

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#2 olcowhand OFFLINE  

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Posted July 30, 2011 - 12:23 PM

I've been into quite a few hydro's, but never had an issue with them picking up pressure after putting them back together. I do try to fill components as much with oil as possible when assembling, pre-fill the filter too. I know you want to have the rear wheels off the ground when starting & cycle the speed control forward to reverse several times to help purge air, but you should have hydraulics right off. If your lift isn't working, then likely the charge pump isn't supplying the hydro with any oil either. Keep the speed control in neutral until the lift starts working. Maybe an air leak on the intake hose?
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#3 caseguy OFFLINE  

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Posted July 30, 2011 - 02:16 PM

:wave: DeVId Welcome to GTTalk! Thanks for the pics! That's a very nice looking restoration you've started and it sounds like Dan's got some good answers for you...good thing 'cause I know nothing about hydrostats. I hope that you get it figured out soon and get it back on the roll! We also hope that you enjoy the forum!
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#4 jjkrjh OFFLINE  

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Posted July 30, 2011 - 07:55 PM

I have had the same issue everytime I have had them apart. You have to prime the pump(sometimes twice) until it picks up fluid correctly. On page 121 it shows you how to prime it.

http://apache.ariens...als/000127A.pdf

Don't let it run very long if it hasn't picked up pressure---the pumps running dry and can be damaged.
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#5 caseguy OFFLINE  

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Posted July 30, 2011 - 08:09 PM

A copy of that manual is also available in our manuals section here
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#6 DeVId OFFLINE  

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Posted July 31, 2011 - 12:09 AM

Thanks guys for your help!

Well here's where i'm at:

Tried priming the pump 5 times tonight starting engine after each times going forward and reverse and trying hydraulic lift but still nothing moves.

"Maybe an air leak on the intake hose?" you're referring to the steel hose from diff to pump right? (it seems O.K) but it's probably full of air.... should I keep primimg the pump?

another thing is bothering me... there's any restriction at all when i turn the wheels... (the tractor is on stands no wheels) bot when i rotate whe wheel it seems like nothing is even linked to the transmission, is this normal?

and what could I have done wrong in the rebuild that could result this?

could it just be the hoses that are not connected where they are suppsed.... the pictures are not really good in the book as for where the hoses cnnect to... you can see how i've connected them on my picture i'll try to post some more tomorrow.

#7 DeVId OFFLINE  

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Posted July 31, 2011 - 07:27 PM

I got a feeling the there is no oil il the pump.... I'm not able to pour a lot of it when priming it...

could someone post me either a clear drawing or a picture of where the 4 hydraulic hoses connect? maybe this is my problem...

#8 olcowhand OFFLINE  

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Posted July 31, 2011 - 09:58 PM

Are you POSITIVE that the pin that drives the charge pump rotor didn't slip out during installation? It wouldn't be the 1st time it has happened to someone.
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#9 DeVId OFFLINE  

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Posted July 31, 2011 - 10:09 PM

Are you talking about the pin #31 on the picture?
I'm pretty sure it's in place but if it happened to someone else it might be my problem...
where would the pin go if it slipped out?

If that's the pin you're talking about, I'll remove the flange and check it tomorow...

what about my question about the axles running freely without restriction is this normal or should I feel the transmission move when turning the wheels?

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#10 DeVId OFFLINE  

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Posted August 01, 2011 - 08:50 PM

Things are starting to look better

i've check'd the pin you were talking about,
it was in place but when i started it up again the pump was pumping :confuse:

the cylinder works but the wheels are still not turning i can feel and hear the pump when I move the speed adjustement from foreward to reverse but nothing moves.... :wallbanging:

could I have missed something that links transmission to axles? i'll probably have to take the diferential off again to look in there...

i'm looking in the book for an idea
if you guys have a clue post it i'll go for it!

thanks a lot were getting close to having it rolling again!

#11 olcowhand OFFLINE  

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Posted August 01, 2011 - 09:39 PM

Are the unloader valves free? They are the 2 pins in the big hex nuts on the top of the hydro. They should be in the "up" position. If they are stuck down, it won't move. Also, is this a 2 speed rear differential? If so, make sure it in engaged.
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#12 DeVId OFFLINE  

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Posted August 02, 2011 - 11:56 AM

The pins are up and I really don't know if it's a 2 speed diff....
but if so how do you engage it?

#13 Enginerd OFFLINE  

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Posted August 02, 2011 - 12:39 PM

The pins are up and I really don't know if it's a 2 speed diff....
but if so how do you engage it?

I don't think Ariens ever used a 2 speed diff on the GT series (my GT17 and GT20 are single speed)
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#14 DeVId OFFLINE  

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Posted August 02, 2011 - 02:11 PM

Thanks Enginerd

That's that's what I thought about the 2 speed but I wasn't certain....

Does anyone know if my wheels are supposed to turn freely without restriction...
I think something might be missing somewhere in between the transmission ans differential that causes this....

lol not really clear but understandable!

#15 Enginerd OFFLINE  

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Posted August 02, 2011 - 03:06 PM

On both of my GT's, there is a lever on top of the transmission that allows it to freewheel in case the engine dies and you need to push/tow it.

Does the GT16 have this lever, and if so, is it in the down position? By now you have probably ruled this out, but just in case...
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