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Looking for used sundstrand series 15 Type U transmission


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#16 olcowhand ONLINE  

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Posted December 29, 2011 - 09:24 AM

Are you certain that you don't have an axle key stripped out. That would cause a similar symptom.


Caught me napping again! That HAS been the case for other GTT members in the past!

#17 DeVId OFFLINE  

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Posted December 29, 2011 - 01:26 PM

should I check pressures before dumping oil again and taking it apart to check the axle key or would this probably be my fix?
and what key could it be?


Rear axle.jpg
and for the pressure gauge set-up... i need to go from "1/2 inch pipe thread to grease gun hose to gauge"
that's all I need?
if so i'll go and buy all that stuff tomorrow.

Thanks a lot you guys you're being a great help.
This tractor has been given to me after my grandpa past way last year.
he always had a hard time to get it to move too.
I really want to get it going again but i don't have a lot of money to throw in it.

#18 ducky OFFLINE  

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Posted December 29, 2011 - 02:13 PM

Yours does not appear to have a key but splines. They can wear bad enough to cause the same thing.
Yes a gauge hose and the proper adapter should do it.
I would check the pressure before tearing into it. as far as the axle goes have a friend watch the end of the hub and see if the axle is turning and the hub is not.

#19 JDBrian OFFLINE  

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Posted December 29, 2011 - 03:32 PM

Another thought. Is the transport valve (the one you use to push the tractor manually) all the way in the operating position. If the relief valve is partially activated then it may act this way as well.

#20 ducky OFFLINE  

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Posted December 29, 2011 - 04:06 PM

I do not think Sundstrand 15 have a transport valve because they were on Peerless 2 and 3 speed axles that had a neutral.
Correct me if I am wrong.

#21 DeVId OFFLINE  

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Posted December 29, 2011 - 04:34 PM

it does have 2 push valves on the top of the pump
the axle shaft and hubs are fine i remember putting it back together and they went in ok.

I thought about those valves too yesterday and checked them and were all the way up but could they be defective? is there a way to check them?

i'm still thinking the charge pump would be the cause... i'd like to check that. could it be that it is sucking air from there?

how could we test it?

#22 DeVId OFFLINE  

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Posted December 29, 2011 - 04:49 PM

I just remembered something i thought my grandpa did.
transmission.jpg
the part numbers 16 17 18 36 20

there's an nail under the plug that he cut to specific lengh.... i know it didn't come stock like that lol
i'll take the plug off after work tonight and post what's really in there....

what are those parts in there for?

#23 olcowhand ONLINE  

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Posted December 29, 2011 - 05:03 PM

I just remembered something i thought my grandpa did.


what are those parts in there for?


If your tractor is not equipped with hydraulic lift, then that is your charge pump regulating valve. If that is stuck open or spring broken, it will bypass too much oil & may be your only problem. If yours IS equipped with hydraulic lift, then parts 16,17,18,19, & 20 on the right side of pump (as sitting on tractor) are your charge pump regulator valve.

#24 DeVId OFFLINE  

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Posted December 29, 2011 - 08:44 PM

my tractor is equiped with hydraulic...
the plug that has a nail in it is the top one... i think he used the head of the nail to shim the spring down a bit as it sits nice inside the plug.

i just got the pressure gauge you want the pressure from the top plug?

#25 JDBrian OFFLINE  

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Posted December 31, 2011 - 04:28 PM

Do you know why your grandfather was shimming that valve? Perhaps knowing the original problem could give a clue as to what is going on.

#26 DeVId OFFLINE  

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Posted January 01, 2012 - 12:37 PM

i'd say he shimmed it to give more resistance to the spring.

I believe that it is a pressure relief valve and he did that to give more strengh to the wheels.

is that the output where you need me to take pressure from?

i cant find the right threads to plug my 1000 psi gauge in that plug.

#27 DeVId OFFLINE  

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Posted January 01, 2012 - 12:38 PM

happy new years by the way!




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