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Mark J.
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I bought this 123 for my son about a year ago. We got it running back in the summer but notice that the transaxle has 2 broken bolt where it bolts to the frame. The internal brake plunger is also stuck so the brakes don't work. The only way to really solve the problems is to pull out the transaxle. I wanted my son to do most of the work of dissemble so I sat in my chair and only helped when he asked. We're ready to pull it out but we ran out of time tonight so we'll finish it up tomorrow.

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Someone really expected to haul a lot of heavy stuff with this hitch!

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Some of the Cubs were pron to breaking off those bolts. Their is a brace that can be bolted to the rear end axle housing bolts with an arm back up to the frame to help with the torque on those 4 bolts. Little pricey but I made mine for a super cub I sold. Well worth the time spent to build them while you have it apart. Good project for the boy - he will learn more doing that than a week at school. Have fun.
 

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Mark J.
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Discussion Starter · #5 ·
Good for you both. He is learning and building real self confidence. While you have it apart, are you going to paint it? Good Luck, Rick
Not sure yet. Haven't really talked about painting it.
 
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Mark J.
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Discussion Starter · #6 ·
Some of the Cubs were pron to breaking off those bolts. Their is a brace that can be bolted to the rear end axle housing bolts with an arm back up to the frame to help with the torque on those 4 bolts. Little pricey but I made mine for a super cub I sold. Well worth the time spent to build them while you have it apart. Good project for the boy - he will learn more doing that than a week at school. Have fun.
I didn't know that the older cub had a problem with breaking their bolts. I had heard about the Supercubs breaking them. I'll have to look into that further. Do you have pictures of the bracket that you made?
 

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Mark J.
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Discussion Starter · #7 ·
Nice, I love to work on the old narrow frames, my dad and I have been doing it for around 40 years!!!
This is our first narrow frame so I'm still learning how their different from my 149. I wish they had a tunnel cover like the 149! It's a lot more difficult to get to the linkages and drive shaft without it!

I hope to have that much time with my son as well! I hope I will have enough patience! My son is going through a phase of telling me that I'm "wrong" or "that's not right" and other things that can really try my patience!!!!

Do you have any suggestion or tricks when working on these narrow frames?

I know I could use your guidance on the internal brake that is stuck.

Thanks Eric!
 
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Mark J.
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Discussion Starter · #8 ·
My son and I were able to remove the transaxle tonight. It came out fairly easy. I think the transaxle is heavier then the engine for these tractors. It gave me a good workout lifting it onto the workbench!

We removed the rear end cover to drain all of the fluid out and I was surprised by the bright red colored fluid that ran out. It almost reminded me of blood. I don't know what kind of fluid it was but it did not look like the Hytrans fluid that I put in my cub 149 last summer. Besides the red color it also seemed like it was a lot less thicker then the Hytrans. I will have to compare the fluids tomorrow. I removed the c-clip from the left axle. Removed the axle and then removed the axle housing. One of the broken off bolts is barely sticking out of the rear end housing and the other bolt is broken below the surface of the housing. I will be trying to drill out the center and remove them with a bolt extractor.

If you know anything about the red fluid such as who makes it or if it can be used in the cub hydro please let me know.

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Beside fixing the broken bolts we will also be replace the rag joint (at the rear of the driveshaft), driveshaft pin, and possibly the driveshaft.
 

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Mark J.
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Discussion Starter · #10 ·
looks like that fluid had a bit of water in it.....
Yep! Before we bought the tractor it had been sitting in PO shop for over 10 years. The previous own before that had it sitting for a long time as well. Have you ever seen fluid this red before?
 

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Mark J.
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Discussion Starter · #12 ·
Yeah it looks like plain old auto trans fluid....
Initially I thought it was ATF. I've just never seen fluid this red. The viscosity seems to be thicker as well. I have some ATF at home that I will compare it too. I hope that doesn't hurt the hydro pump.
 

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It might be a mix!
 
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Mark J.
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Discussion Starter · #14 ·
It might be a mix!
That makes sense! Do you think it hurt the hydro? The hytrans is very thick compare to the fluid that I removed. Might have to just wait and see. I'll look more closely at the gears and bearings to see if there is any visible damage. I don't want to dig into this any further then I have to. I'll make sure and clean out as much of the old fluid as I can.
 
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If it was still working, you are probably okay.
 
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This is our first narrow frame so I'm still learning how their different from my 149. I wish they had a tunnel cover like the 149! It's a lot more difficult to get to the linkages and drive shaft without it!

I hope to have that much time with my son as well! I hope I will have enough patience! My son is going through a phase of telling me that I'm "wrong" or "that's not right" and other things that can really try my patience!!!!

Do you have any suggestion or tricks when working on these narrow frames?

I know I could use your guidance on the internal brake that is stuck.

Thanks Eric!
Yeah, working on those old narrow frames are a real pain but just take your time. And on the brakes (the last time I had one apart was more than 25 years ago) but the problem was the piece the brake rod pushes on was stuck in the rear end. We tore everything with the brakes apart, put new brakes in and haven't had an issue since... Just take your time......
 

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Mark J.
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Discussion Starter · #17 ·
Found some time to work on the 123 today. We drill out the broken bolts on the left side of the axle tubes, inserted a bolt extractor, and they came out with no problems.

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Next up was to see if we could get the internal brake puck to move freely. We had to make some room so we removed the suction tube. I'm sure there's a reason why it's so long but the one on my 149 is only about 4 inches.

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Next, we removed the brake pivot shaft by removing the adjustment bolt and then driving the shaft out. You can see that the shaft has a grove that keeps the shaft secured.

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Using a brass punch I got it to move. I pulled it back out but I couldn't get it to fully pull out before the pliers slipped off. I'd really like to see what the brake material looks like but I don't want to have to go internal and remove a whole bunch of stuff to drive the pad all the way out.

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We finished up by removing the right side axle shaft and tube. We found more moister and it allowed us to be able to remove all of the ATF that someone mistakenly filled this up with. The axle retaining clip was also bent and missing a chunk of metal so I will have to get a new one. The clip could have fallen out when we least expected making life miserable.

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Time to order up some gaskets, seals, filter, fluid, grade 5 bolts, driveshaft pin, and rag joint so it will be ready for the shows this summer. We'll see how much money my son has saved up!!!
 

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Looks like you got a good handle on it. Been around these a long time and I've never seen any of those bolts broken off on the frame. I know the aluminum rears that were made by CCC after MTD bought Cub Cadet had issues with stripping the threads out when using rear hitches but not this issue. Must have been loose a while and just got to weak and snapped off. Good time to chase the threads in trans housing and replace all the bolts like you're doing. Don't worry too much about that hydro pump. Those Sundstrand units were pretty tough and could take quite a bit of abuse. I'd suggest repairing the trunnion if needed while you're this far apart.
 

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Mark J.
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Discussion Starter · #20 ·
Looks like you got a good handle on it. Been around these a long time and I've never seen any of those bolts broken off on the frame. I know the aluminum rears that were made by CCC after MTD bought Cub Cadet had issues with stripping the threads out when using rear hitches but not this issue. Must have been loose a while and just got to weak and snapped off. Good time to chase the threads in trans housing and replace all the bolts like you're doing. Don't worry too much about that hydro pump. Those Sundstrand units were pretty tough and could take quite a bit of abuse. I'd suggest repairing the trunnion if needed while you're this far apart.
Thanks

Is the trunnion the piece that attaches to the rag joint and the hydro? What do you look for? It a little loose but the pin seems to ok.

Is the pin for the driveshaft coupler a specially type pin?
 
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