57 cub lo boy hydraulics

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Mconpro
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57 cub lo boy hydraulics

Postby Mconpro » Fri Dec 04, 2020 4:09 pm

Hi everyone. While plowing the other with my cub, my touch control became erratic and finally stopped working altogether. Hydraulic fluid was almost empty and when I checked the engine oil, it was overfull and looked almost black. I’m thinking it’s time to rebuild the hydraulics? If that’s the case can anyone point me in the right direction to find a how to or at least the steps I need to follow to do this? Is it a job someone whose minimally mechanically inclined can do? Thanks so much.

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Don McCombs
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Re: 57 cub lo boy hydraulics

Postby Don McCombs » Fri Dec 04, 2020 4:31 pm

What you have likely experienced is a failure of the Touch Control pump drive shaft o-ring seal. Here is a link to the how-to describing the repair procedure. It is fairly simple. I would not bother buying the entire pump rebuild kit. Find a new o-ring at a plumbing supply house. You need a #112 buna-n o-ring. Be very careful removing the lock washer and you should be able to re-use it. A new one is over $40.

http://farmallcub.com/phpBB2/viewtopic.php?t=44196
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Glen
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Re: 57 cub lo boy hydraulics

Postby Glen » Fri Dec 04, 2020 6:12 pm

Hi,
I don't know how much you know about repairing tractors, you can decide after looking at the How To that Don posted above if you want to repair the pump yourself.

Here is some info about the Touch Control pump, if you need it.

To remove the pump, you have drain the system first. Remove the filler plug on the Touch Control, then the drain plug. You can run the engine briefly, like the operator's manual says, to empty the tubes.
You have to remove the tubes to remove the pump from the engine.
The tubes have 3 bolts at the upper end, and 2 bolts hold them onto the pump.

If the LoBoy has the underaxle exhaust system, you might have to loosen the exhaust system, and move it some, if the exhaust pipe is over the bolts holding the upper end of the tubes on the unit.
The exhaust pipe is in the way on some of them, some of them it is not in the way.
There is a gasket at the upper end of the tubes, and 2 o rings at the lower end of the tubes, the gasket and o rings come in the pump rebuild kit from TM Tractor, it showed in their info.

2 of the 4 bolts in the pump hold the pump on the engine. Looking forward from the rear, they are the upper left, and the lower right bolts. Don't remove the other 2 bolts before getting the pump to a clean work bench, it can fall apart. You can loosen them while it is on the engine.

The lock washer holding the nut on at the pump gear has to be good, to keep the nut from coming off during use. It bends over 1 flat of the nut. You have to bend the lock washer away from the nut to remove the nut. If the lock washer is still good, you can use it again.
It has to have the little tab that goes into the keyway, to prevent the nut from turning. Sometimes the tab breaks off, some people on here have said. If the tab is broken it needs a new lock washer.

Below is a new lock washer at TM Tractor, you can see what it looks like.

http://www.tmtractor.com/new/hy/562fp.htm

Below is the pump shaft o ring.

http://www.tmtractor.com/new/hy/396fp.htm

Below is the pump rebuild kit, if you would rather have that.

http://www.tmtractor.com/new/hy/288fp.htm

The pump shaft seal o ring is at the front of the pump, near where the shaft sticks out of the pump.

The pump shaft where the o ring runs has to be flat and in good condition. Sometimes the shaft wears, and there is a groove. If there is a groove, it needs repair. It may need smoothing with fine sandpaper.

Use plenty of clean Case IH Hy-Tran fluid when putting the pump together.
There are other brands, be sure it works with IH hydraulic systems before buying it.

Below are pages from the 1955 Cub operator's manual, showing the parts of the system, and how to check or change the fluid.
On the 2nd page, be sure to do what it says in paragraph 4, to remove the air from the system. The arms should go through their full travel.

http://farmallcub.com/rudi_cub/www.clea ... age-65.jpg

http://farmallcub.com/rudi_cub/www.clea ... age-67.jpg

Be sure to check the Touch Control fluid with the arms in the rear or down position, not the up position.

The pump rebuild How To that Don posted above has lots of info.

Below is a pic from TM Tractor of the pump gear, nut, and the lock washer. :)
Attachments
Cub T C pump.jpg

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Re: 57 cub lo boy hydraulics

Postby Masmith » Sat Dec 05, 2020 9:37 am

This video is a perfect way to do it. I rebuilt mine following these steps. Worked great.

https://youtu.be/1aqH6jbcjd0
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Re: 57 cub lo boy hydraulics

Postby Mconpro » Sat Dec 05, 2020 6:51 pm

Thank you so much everyone! I think this something I can definitely. Just ordered the whole rebuild kit. One last question though, I know I will need to change the engine oil cause of the hydraulic fluid in it. Is there anything extra I will need to do other than drain and change?

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Re: 57 cub lo boy hydraulics

Postby staninlowerAL » Sat Dec 05, 2020 7:34 pm

Replace oil filter also, (usually a standard item).

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Don McCombs
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Location: MD, Deep Creek Lake

Re: 57 cub lo boy hydraulics

Postby Don McCombs » Sat Dec 05, 2020 11:12 pm

If it was me, I would drain any remaining hydraulic fluid and replace with fresh.
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Mconpro
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Re: 57 cub lo boy hydraulics

Postby Mconpro » Fri Dec 11, 2020 7:06 pm

So I got it all torn down but the shaft has the slightest groove in it. Will this work? If not anyone know where I can get a replacement? Thanks in advance.
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174078E4-8F83-4F70-8A47-1C4E471B73BA.jpeg

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Re: 57 cub lo boy hydraulics

Postby Bob McCarty » Fri Dec 11, 2020 7:42 pm

I doubt that you'll find just a smooth shaft for sale. Several choices; if the groove is insignificant in your mind, you could try and polish the groove and rebuild. You can switch to an "X" cross section o-ring that should ride on either side of the groove. There are also several on the Forum who can machine the groove to take a lip seal which can be placed to avoid the groove.
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Glen
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Re: 57 cub lo boy hydraulics

Postby Glen » Fri Dec 11, 2020 7:50 pm

Hi,
I haven't seen on here that anyone has said there are new replacement shafts with the gear for the pumps.

The o ring works best if the shaft is the original size.
You could sand it with fine sandpaper and clean it up, it looks like it is dirty or something there at the groove.

Shane Nelson showed before that he welded up one or more of them, and turned them down to original size. :)

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Re: 57 cub lo boy hydraulics

Postby Jim Becker » Fri Dec 11, 2020 10:39 pm

Glen wrote:Hi,
I haven't seen on here that anyone has said there are new replacement shafts with the gear for the pumps.
. . .

There aren't and never were.

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Re: 57 cub lo boy hydraulics

Postby Gary Dotson » Sat Dec 12, 2020 8:41 am

I would polish the shaft with very fine sand paper and get a better look at the condition. It doesn't look real good in the pic. but that can be deceiving, may not be all that bad. Several people have used the "X" o-ring successfully so it's worth a try.

Mconpro
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Re: 57 cub lo boy hydraulics

Postby Mconpro » Sat Dec 12, 2020 3:12 pm

Got it. Can anyone tell me what size and where I might get an “x” o ring?

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Re: 57 cub lo boy hydraulics

Postby Jim Becker » Sat Dec 12, 2020 3:28 pm

I think all the info you need is in John's post here:
viewtopic.php?f=1&t=104466


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