Hydraulic Pump Question

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Dadsfarmalls
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Hydraulic Pump Question

Postby Dadsfarmalls » Fri Apr 24, 2020 8:29 pm

So I took off the hydraulic pump the other day and started rebuilding it today, mostly following the how-to section tutorial. I got everything taken apart just fine, and cleaned up the best I could. My question is on the main drive shaft, where the o-ring sits. It mentions that if the shaft has lines in it there you can use some crocus clothe or if its marked up bad then it's probably shot. I guess my question is what does marked up bad equate to?

I can see that mine is worn there, feels kind of like the depth of a piece of paper at most. I'm guessing thats ok enough to just smooth it out with the cloth but wanted to make sure. Thanks.

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Re: Hydraulic Pump Question

Postby Bob McCarty » Fri Apr 24, 2020 8:32 pm

If the groove is rough, it will just wear out the new o-ring quicker and start leaking again.
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MiCarl
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Re: Hydraulic Pump Question

Postby MiCarl » Fri Apr 24, 2020 9:06 pm

It's going to be really hard for anyone to make a good evaluation of it without touching and feeling it. If you can snag your fingernail on it I'd guess it'll give you trouble. Not a lot of expense in having to redo it if you try it and it doesn't work. You'll definitely want to polish it up so it's smooth.
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Bob McCarty
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Re: Hydraulic Pump Question

Postby Bob McCarty » Fri Apr 24, 2020 9:12 pm

Several have had their pumps machined out for a lip seal which can be seated away from the groove.
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Dadsfarmalls
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Re: Hydraulic Pump Question

Postby Dadsfarmalls » Fri Apr 24, 2020 10:12 pm

I know this isn't great but heres a close-up of it. The left side (side with the gear) is where I can feel the main lip, and yes it's just enough to catch your nail on.
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groove.jpg

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Re: Hydraulic Pump Question

Postby Jim Becker » Fri Apr 24, 2020 11:28 pm

You might have better luck if you use an X-profile o-ring. Info in John's post here:
viewtopic.php?f=1&t=104466

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Dadsfarmalls
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Re: Hydraulic Pump Question

Postby Dadsfarmalls » Sat Apr 25, 2020 2:08 am

Thanks Jim, I'll look in to those.

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MiCarl
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Re: Hydraulic Pump Question

Postby MiCarl » Sat Apr 25, 2020 6:44 am

Dadsfarmalls wrote:I know this isn't great but heres a close-up of it. The left side (side with the gear) is where I can feel the main lip, and yes it's just enough to catch your nail on.


I really think mine was worse than that. All I did was polish it up and it's been fine for several years now, although it probably doesn't get more than 50 hours/year use.

I wonder if what you feel isn't a ridge of built up crud on the shaft. I'd polish that up and then re-evaluate it.
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inairam
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Re: Hydraulic Pump Question

Postby inairam » Sat Apr 25, 2020 7:03 am

Here is an old long post that covers replacing the o ring with a lip seal. lot of good info. The lip seal will fall on the different place on the shaft and you may be ok.

viewtopic.php?f=1&t=40331&hilit=pump

There are also shaft sleaves but that may be more work that trying to find a donor pump on eBay or the vine.
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Re: Hydraulic Pump Question

Postby kfnut » Sat Apr 25, 2020 7:04 am

I had this problem a couple of years ago . I installed a speedy seal on the shaft and solved the problem .

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Re: Hydraulic Pump Question

Postby ricky racer » Sat Apr 25, 2020 1:18 pm

I think that if you smooth the worn area with crocus clothe or fine emery cloth and install a new o-ring, you'll probably be good. There are better fixes out there but if you don't have access to a machine shop, the other measures will likely do you just fine. The x-ring might be a good option.
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Dadsfarmalls
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Re: Hydraulic Pump Question

Postby Dadsfarmalls » Sat Apr 25, 2020 4:05 pm

Well I couldn't find crocus cloth here locally so I got some fine emery cloth. Overall I'm happy with the result. I can still feel the one main spot a little bit but it's not nearly as noticeable, can't snag my nail on it anymore, and the rest smoothed out really well. Think I'm just going to finish up the rebuild, as it's not that difficult or expensive of a process if something happens and I have to redo it later down the road.
Attachments
2.jpg

Bob McCarty
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Re: Hydraulic Pump Question

Postby Bob McCarty » Sat Apr 25, 2020 4:08 pm

Dadsfarmalls wrote: Think I'm just going to finish up the rebuild, as it's not that difficult or expensive of a process if something happens and I have to redo it later down the road.

That looks good, and it's always easier the second time around....
"We don't need to think more,
we need to think differently."
-Albert Einstein

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Re: Hydraulic Pump Question

Postby Glen » Sat Apr 25, 2020 5:25 pm

Hi,
The 1965 Cub and LoBoy operator's manual has info for changing and filling the Touch Control fluid, and removing the air from the system on pages 62, and 63.

There are mistakes on the 2 pages. The last paragraph on page 62, and the first 3 paragraphs on page 63 are mistakes, Cubs don't have what they are talking about. The info is for another model of tractor.

http://farmallcub.com/rudi_cub/www.clea ... age-62.jpg

Be sure to do what it says in paragraph number 4, on page 63, to remove the air from the system, the arms should go through their full travel.
Be sure to fill the system the last time with the arms in the rear, or down position. :)

http://farmallcub.com/rudi_cub/www.clea ... age-63.jpg


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