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'Nother dumb hydraulic question

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SF Mike

02-20-2007 19:26:20

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I just bought a "52 Super M that has a three-point added.
It has two cylinders and looks pretty sturdy.
There are two hoses from the left side going to the left one and two on the right, one from the side and the other from the bottom going to the right one..
It has a "unhooked" M&W handclutch I hope to fix.
I am mainly going to use this for mowing and incidental pulling.
Is this hydraulic arrangement a good thing?
I grew up with a "straight" M many years ago, but retain no knowledge of it"s works.

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Nat 2

02-21-2007 11:19:11

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 Re: 'Nother dumb hydraulic question in reply to SF Mike, 02-20-2007 19:26:20  
Your description is a little vague.

Are you saying that the lines to the 3 point come directly from the "belly pump," the sides of the big casting between the back of the engine and the rear end?

Okay, assuming that, the belly pump, or hydraulic Liftall as it was called, has two OUT ports on the left, and one on the right. The front left port and the right port apply pressure at the same time. The rear left port has a delay before it starts applying pressure.

If two hoses from the same cylinder go to the two ports on the left, that is BAD. You will blow up the Liftall if you attempt to use it this way, worst case. Best case it will not work well at all.

The correct plumbing is:
1. Bottom port on left cylinder to front left liftall port.
2. Bottom port on right cylinder to right liftall port.
3. Top port on BOTH cylinders to a T-fitting.
4. T-fitting to the drain on the bottom of the belly pump.

Lower the 3 point all the way, then refill the belly pump to the point indicated on the dipstick.

This gives you gravity down and power up. You are also using the 3 point cylinders are external reservoirs.

If you want power up, power down:
1. Bottom cylinder ports to a T fitting.
2. Top cylinder ports to a Tee fitting.
3. T-fittings to "work" ports on an open-center two-way valve. 4. Right liftall port to the IN port on the two-way valve.
5. OUT port on the two-way valve to the a Tee fitting installed on the filler neck of the liftall pump under the gas tank.
6. Plug the vent hole in the filler cap, or replace with a standard 3/4" pipe end cap.

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sf mike

02-21-2007 12:50:24

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 Re: 'Nother dumb hydraulic question in reply to Nat 2, 02-21-2007 11:19:11  
Hope this works, link to pics.
I have not had time or opportunity to do anything with the tractor as it is where I am moving to.
It goes up and down and that's all I know. Sounds different.


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City-Boy McCoy

02-21-2007 02:25:03

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 Re: 'Nother dumb hydraulic question in reply to SF Mike, 02-20-2007 19:26:20  
Indeed, it is a VERY good thing. Not only is it handy, but to buy a new quality 3-point hitch with two cylinders would consume the better part of $1,000 by the time you purchased it, paid shipping and finished plumbing it to the tractor. mike

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