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Farmall & IHC Tractors Discussion Forum
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MW hydraulic pump on a farmall M

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Gerard Reaume

04-10-2005 13:37:35




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I put an M&W hydraulic pump on my 1941 farmall M. It works great. I am using my existing belly pump hydraulic reservoir as the oil storage unit for the M&W pump. With live hydraulic power, do I need to put a vented cap on the oil fill opening, or must I keep it sealed off? The reason I am asking is because I intentionaly left the oil cap off with the engine running to see what would happen. As soon as the oil pump worms up it starts bubbling out of the opening. If I seal it up will it build up preasure and cause other problems? I sure need advice on this one. Can anyone help?

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RustyFarmall

04-10-2005 13:41:40




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 Re: MW hydraulic pump on a farmall M in reply to Gerard Reaume, 04-10-2005 13:37:35  
Did you remove the drive coupling for the belly pump?



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Gewrard Reaume

04-10-2005 13:53:50




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 Re: MW hydraulic pump on a farmall M in reply to RustyFarmall, 04-10-2005 13:41:40  
I did not remove the drive coupling from the belly pump as I thought it would not matter as long as I did not activate the belly pump. Should I remove the drive coupling anyway?



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RustyFarmall

04-10-2005 14:14:21




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 Re: MW hydraulic pump on a farmall M in reply to Gewrard Reaume, 04-10-2005 13:53:50  
Most of the conversions I have seen not only removed the drive coupling but also removed all of the internals from the pump, although I think you could get by with just removing the drive. You will have to drop the pump in order to accomplish this.



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Ken K.

04-10-2005 21:25:11




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 Re: MW hydraulic pump on a farmall M in reply to RustyFarmall, 04-10-2005 14:14:21  
I have a M&W live pump on my MD using the belly pump housing for storage. On my belly pump the pressure line goes into the hole where the old pump drive shaft was with a special cast pipe and screw set-up from M&W. The later M&W kits did away with this set-up and you just pluged the drive shaft hole and they added a by-pass valve that was mounted on the 2 way valve.(Christmas tree) The gears are gone from the inside of the pump but everything else is original except the by-pass spring which must have been replaced with a stronger spring because now it puts out about 1200 lbs. hydraulic pressure compaired to the original 800 lbs. My MD has the 2 way valve on it so you need the screw on the filler cap closed when you use 2 way hydraulic cylinders. Open the valve for 1 way cylinders. (If you don't close the valve, oil will come out of the valve on the cap!)

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