Hyd Pump o-ring

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Hyd Pump o-ring

Postby ricky racer » Fri Oct 25, 2013 4:43 pm

Does anyone know the size of the o-ring for the pump shaft for a Cub. It should be a 2- something.
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Re: Hyd Pump o-ring

Postby Jim Becker » Fri Oct 25, 2013 5:29 pm

Parts book says 1/2 x 11/16 x 3/32.
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Re: Hyd Pump o-ring

Postby Bob McCarty » Fri Oct 25, 2013 5:51 pm

AS568A dash number 112 if that helps.

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Re: Hyd Pump o-ring

Postby ricky racer » Fri Oct 25, 2013 6:28 pm

Thanks guys. I found out yesterday evening that I had a leak on the '57 and I want to fix it this weekend.
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Re: Hyd Pump o-ring

Postby Don McCombs » Sat Oct 26, 2013 5:07 pm

This is incomplete, but should help.
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Cub Hydraulic O Ring Sizes.pdf
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Re: Hyd Pump o-ring

Postby ricky racer » Sat Oct 26, 2013 7:16 pm

Thanks Don. I picked up a baggie of them at TSC this evening and should have it installed tomorrow. :wink:
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Re: Hyd Pump o-ring

Postby Hengy » Mon Oct 28, 2013 1:36 pm

Don McCombs wrote:This is incomplete, but should help.


Just a note on the file that Don posted. I learned from Pete Green (via my old buddy Craig) that the round-profile o-ring will function just as well as the square profile rung originally provided. I have installed 3 such rings in the three cubs I have had with hydraulics and have had zero problems. Merlin's is used at least weekly for lawn mowing duty. Cost is FAR less expensive for the round than the square version... dimensions are the same...

Thanks!

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Re: Hyd Pump o-ring

Postby Don McCombs » Mon Oct 28, 2013 2:39 pm

The McMaster-Carr number for the round cross-section o-ring is 9452K139. The difference in price is 15 cents for the square, 9 cents for the round.
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Cub Hydraulic Pump O Ring Sizes.pdf
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Re: Hyd Pump o-ring

Postby Hengy » Mon Oct 28, 2013 2:46 pm

That is IF you buy it from McMaster. Sorry I didn't look at their website. It was my understanding that the price was "a bit" more than $0.15 for the square o-ring....
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Re: Hyd Pump o-ring

Postby Don McCombs » Mon Oct 28, 2013 2:56 pm

I didn't check on the single unit prices. I was just commenting on the relative price difference at M/C. I don't think those sizes are readily available from a local type or big box hardware store in the necessary composition. Maybe a seal/bearing house. In any event, you need to make sure that what you get is compatible with hydraulic fluids whether it's square or round.
Don McCombs
MD, Deep Creek Lake

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1977 International Cub w/FH
1978 International Cub
1948 Farmall Super A
1951 Farmall Super C w/FH
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