Sunstrand hydro pump parts

[Wheelhorse#1 1,657]

Hello all 

Im looking for information on a sunstrand 90-2019

I can’t seem to find any info on it here or elsewhere.

This unit is on a 1974 12 auto no name and it seems this isn’t the original hydro it came with originally.

Id like to possibly rebuild if possible.

thanks for the help 

 

[gwest_ca-(File Mod) 11,043]

If you have a no-name model 1973 was the only model year for them. 

What is the tractor model and serial number?

Have you see the list of applications? Click on the picture

 

[pfrederi 17,739]

Pretty much Sunsttand hydro gears (note later piston to piston are different) are all the same units just minor differences in motion control set up and Tow valves if they have hydro loft or not.   Internals (slippers valve plates, acceleration valves etc are all the same.  Charge pump relief valves are the same but located different if you have hydrolift.  What are you planning on doing to your unit.  have you looked at the manual ) link in previous post

[Wheelhorse#1 1,657]

5 hours ago, gwest_ca said:

If you have a no-name model 1973 was the only model year for them. 

What is the tractor model and serial number?

Have you see the list of applications? Click on the picture

 

Thanks Yes it’s a 73 sorry I wrote 74.

Im looking over this info now thanks for posting this .Had downloaded it previously but could find here .

The model I have is 

104 65 8 

Edited June 30 by Wheelhorse#1

[Wheelhorse#1 1,657]

4 hours ago, pfrederi said:

Pretty much Sunsttand hydro gears (note later piston to piston are different) are all the same units just minor differences in motion control set up and Tow valves if they have hydro loft or not.   Internals (slippers valve plates, acceleration valves etc are all the same.  Charge pump relief valves are the same but located different if you have hydrolift.  What are you planning on doing to your unit.  have you looked at the manual ) link in previous post

Yes Sir Thanks

 I was planning on going over and possibly refinishing the slippers valve plate etc.

Im looking over the manual now.

 

[gwest_ca-(File Mod) 11,043]

Your model number is written 1-0465. The 8 is not used but if you subtract 5 from that 6th digit you get the model year. 8-5=3=1973

 

Two pages of search results with a 1-0465 search

https://www.wheelhorseforum.com/search/?q=1-0465&quick=1&type=downloads_file

 

Can find no record of Wheel Horse using the 90-2019 transmission.

[daveoman1966 3,751]

I have to presume that the 'manuals' referred to in this thread are the OEM service manuals for the Sundstrand Hydrogear models.  In addition to those excellent reference manuals, I offer here a self-made hands-on experience .pdf file for free download. I have overhauled a dozen or more of these units and hopefully this file will benefit others.  The photos in this file are in no particular order but are usually captioned.      

SUNDSTRAND HYDROGEAR refurb.pdf

[ebinmaine 67,496]

Following along to learn. 

[Wheelhorse#1 1,657]

11 hours ago, gwest_ca said:

Your model number is written 1-0465. The 8 is not used but if you subtract 5 from that 6th digit you get the model year. 8-5=3=1973

 

Two pages of search results with a 1-0465 search

https://www.wheelhorseforum.com/search/?q=1-0465&quick=1&type=downloads_file

 

Can find no record of Wheel Horse using the 90-2019 transmission.

I can't find any info on this pump being used by WH either,I tried google search and no info at all on it...weird 

Its been replaced somewhere along in its life.Also someone removed the parking pawl a welch plug is in its place.

Thx for the help

 

[Wheelhorse#1 1,657]

8 hours ago, daveoman1966 said:

I have to presume that the 'manuals' referred to in this thread are the OEM service manuals for the Sundstrand Hydrogear models.  In addition to those excellent reference manuals, I offer here a self-made hands-on experience .pdf file for free download. I have overhauled a dozen or more of these units and hopefully this file will benefit others.  The photos in this file are in no particular order but are usually captioned.      

SUNDSTRAND HYDROGEAR refurb.pdf 3.35 MB · 1 download

 

I appreciate you posting this information, very helpful.And will use it for when I decide to do the teardown of this unit.

If anything I hope to learn something and possibly improve the performance. 

 

[pfrederi 17,739]

52 minutes ago, Wheelhorse#1 said:

I can't find any info on this pump being used by WH either,I tried google search and no info at all on it...weird 

Its been replaced somewhere along in its life.Also someone removed the parking pawl a welch plug is in its place.

Thx for the help

 

 

The parking pawl is part of the transaxle (a wheel horse part) not related to the sunstrand hydro gear number...

[Wheelhorse#1 1,657]

Wile out in the shop I took a couple pix of what I have.

The pump looks similar to ones in the manual but not identical as far I could tell anyway.

I’m not sure which valves are what ? 
For now I’m trying to identify the reverse valve.

Reason is ,that it moves slow in reverse,one speed.

Forward speed  is fine except when under load say pushing heavy snow or dirt it sometimes surges forward.

 

The circle on last pic is what I believe to be the reverse valve ? Would this be correct? 

 

 

 

 

 

Rear view 

 

Top view.

Front

Edited July 2 by Wheelhorse#1

[pfrederi 17,739]

What you circled is the access to the internal plug that can sometimes fall out of position causing no movement...  c in the circled diagram.  Where is your tow valve they moved them around over the year between models

 

 

[Wheelhorse#1 1,657]

5 hours ago, pfrederi said:

What you circled is the access to the internal plug that can sometimes fall out of position causing no movement...  c in the circled diagram.  Where is your tow valve they moved them around over the year between models

 

 

Tow valve circled in green.

There os a cut out for access right inside the storage box under the seat.

[pfrederi 17,739]

I am pretty sure that is an acceleration relief valve.   not a tow valve.

 

some early WH hydro gear had the relief valve on the back of the head you had to reach it in front of the tool box.  Would be the bolt head above and right of your circle.

 

There is a older manual for the early Wheelamatics I have .  Will scan a few pages later as it is closer to the way yours is set up with tow valve.

 

Have you used the tow valve???

Edited July 2 by pfrederi

[Wheelhorse#1 1,657]

1 hour ago, pfrederi said:

 

Have you used the tow valve???

Yes sir I have used it.Turning the screw counter clockwise will loosen then I was able to move the tractor freely.

It makes sense because there is an access cutout under the seat inside the front of the tool box for it 

Thanks again for the help ! 

[pfrederi 17,739]

Sorry took so long.

 

 

 

Edited July 3 by pfrederi

[Wheelhorse#1 1,657]

@pfrederino problem at all ,no hurry here .Ill compare when  I get into the shop.

Thanks for taking the time to help.

 

[pfrederi 17,739]

Loaded the whole manual to the files section. 

 

 

[Wheelhorse#1 1,657]

Excellent thank you.I haven’t had a chance to mess around with it as I’ve been sick a few days .

Starting to come around though.

This will make it much easier now that I know what I’m dealing with .

[Wheelhorse#1 1,657]

Finally managed to identify the forward dampening valve with the help of @pfrederi.

Took apart and it looks to be in pretty good shape as far as I can tell.

Ill go ahead and replace the O-rings .

Looks like it takes two sizes large and small.

Large 970093 small 970014.

 

 

Edited July 17 by Wheelhorse#1

[Wheelhorse#1 1,657]

Tow valve.Ill remove the reverse valve next .

O-ring part # 970010

 

Edited July 17 by Wheelhorse#1

[pfrederi 17,739]

I have found that WH part numbers for O rings USUALLY contain the O ring dash number.   The last 3 digits are the dash # this applies to the later Hydro gears..However the wheelamatic used different numbers on some things.  Also the Wheelamatic doesn't show the part numbers for some internal things  (you weren't supposed to mess with them like o rings for acceleration valve innards. So look at the hydro gear section of the Sunstrand manual...by then they decided you could work on it and the sort of standardized #s last 3 equal to Dash #

 

The three you listed with old WH numbers are 970010 is a Dash 011  970014 is Dash 015  97053 is I think Dash 118.  The dimension in the Wheelamatic manual don't make sense ID is larger than OD

 

 

I have many of the o rings when you know what you want i can give you what ones I have...

Edited July 17 by pfrederi

[ebinmaine 67,496]

29 minutes ago, Wheelhorse#1 said:

Tow valve.

 

@daveoman1966

Or others...

 

Is an antiseize of some sort ok on the threads here?

I do realize introduction of anything but proper  oil or ATF to the hydro system  isn't a good idea. 

[pfrederi 17,739]

I would not use it on the port valve type.  Maybe a touch on the threads of the later ones.  The don't seize up if the are used occasionally and not left out in the rain.  I have 7-8 Sunstrands never had a problem so I don't use any.