I followed the service manual instructions for disassembly. Except for using a wood block to work on.

Needle bearings look good. I used a flathead and pliers to pull the dried out seals out.

All seals removed. To be continued. Next step, parts cleaning.

Make sure you mark the valve plates and put them back in exactly the same way you took them out don't drop the pistons and put them back in the
same bore they came out of,put the charge inner and outer rotor back in the same way it came out.
Don't drive the swash plate shaft pin out too far or yer screwed.
best to follow the manual and multiple video's on diss/ re assy.
Otherwise you will be getting another hydro on ebay.
Make sure you check the roller bearing surface on the output shaft gear for pitting, they tend to wear there.
----done a few :BlahBlah:

Your braver than I am. That looks like a real hand full.

I'll be watching how the rest of your tractor comes together. I thought my 149 was rough but yours has mine beat. But I had to pay for mine.

https://www.onlycubcadets.net/forum/...ad.php?t=55868

Yikes. I have already mixed up the little individual pistons. I took them out to clean them in the parts washer. I didn't see any wear on any of them so I hope I can be lucky and make it work. OR should I go ahead and search up Ebay for a replacement hydro unit now that they've been mixed up? I haven't gotten around to checking the roller bearing on the output shaft so thanks for the heads up on that one!

Yep. I've successfully rebuilt several automatic transmissions so I figure I'd give the tractor world a try. Headed over to check out your 149!

It's working!!
 

Just to follow up to this thread. The rebuilt Hydro is working strong with no leaks!!! Drove it all around and through my field and used it to move a 149 parts tractor around on 3 flat tires with great pulling power.

I have a remaining items I have to do related to the hydro. The first is to figure out how to adjust it to where the hydro sits in full neutral when the brake is pressed. Currently it wants to go forward when I push the brake to the floor.
The second issue is that while I'm driving, the lever will sometimes creep towards full throttle if I go over a good bump.

Wow that's cool! Makes me wonder why 2 years ago everyone here told me to buy a replacement for my 107... because this is clearly evidence that I could have acquired a replacement piston assembly and rebuilt the pump... Oh well, nothing I can do about it now. Good to see someone doing hydro rebuilds despite the fact that it seems frowned upon... not sure why, there's an entire section in the repair manual dedicated to hydro pump maintenance

:bigthink:

Fried: My last twenty eight working years were spent rebuilding hydraulic components and I've certainly done a hundred Sundstrand hydro stats. The advice to not mix up the pistons with respect to bores is normal, but if they are all in good condition, then it doesn't matter. Where most home rebuilders screw up is getting the charge pump on backwards. Or trying to "resurface" the lens plates and barrel faces. You obviously got it right!! Nice work.

Yeah. I was taking a blind chance at getting it but it seemed as if everything was kept clean, it would work out okay for me. Other than mixing up the pistons I had no issues.

Ambush, Thanks!! This was a major step forward in my 149 project. Do you have any recommended online sources for replacement rubber hydraulic hoses for the lift cylinder?