Help needed with hydraulics

lucanuse · Jul 17, 2008

I'm in a bind and could use some input. I have a regular M. I have gone through 3 belly pumps trying to get it to adequately raise my 9 ft mower blade. The third belly pump worked OK, but this morning it won't lift anything. It doesn't feel like any fluid is moving through the hoses at all and it doesn't make any noise like it might be working. Any idea what could be wrong?

Someone has added power steering to this tractor. I'm wondering, can I just put a T on the power steering line and run that back to my mower. I have a single cylinder on the mower, so which of the two hoses that go to the power steering would I need to T into and where? (The hoses now come out of the engine area, one goes up to the steering wheel and the other goes into a box and then up to steering wheel. My apologies for my ignorance, hopefully I have explained the situation.) I do have a double acting cylinder laying around, would that work better, and again if I need to use that cylinder where do I need to T into the lines?

Thanks

Anonymous-0 · Jul 17, 2008

Dont tap into the power steering system. Put a pressure guage in the line going to the cycl on the mower to see how much pressure you are getting. You could unscrew the hose going to the cycl and placing it over the fill tube on the belley pump with cap off. When the engine is running move the handle back and check the flow coming out of the hose that way you know at least the pump is working. If you get a flow place a tee in the line at the cycl and put a guage in the tee.

Allan in NE · Jul 17, 2008

Hoses? As in plural? More than one?

Sounds like you've got a double acting cylinder on a single acting system.

Never gonna work unless you get rid of one of those hoses and put in a dummy "vent".

No, don't use the PS system. Find someone to show you how to plumb that mower.

Allan

mkirsch · Jul 17, 2008

Allan, it used to work if I understand him correctly.

First thing I'd do is check the pump drive coupler. I think the M's can shear the pin and spin free. You've had the pump out so you should be familiar with that to check it...

Does the control rod feel "right?" Does it pull as hard as it should, and click in the right places? If it just flops around that's a BIG red flag that something's wrong. You'd think people would notice obvious things like that, but for some reason, they don't...

What diameter cylinder do you have? Bigger cylinder will lift more weight.

Are these used or rebuilt pumps? You can rebuild the pumps.

No, you cannot T off the power steering pump lines. You will lose both your hydraulics and your power steering. When you try to lift the mower, the power steering will work, and when you try to use the power steering, the mower will lift.

lucanuse · Jul 18, 2008

Thanks for the input. Is the pump drive coupler attached to the hydraulics lever? Are you suggesting that where the hydraulics lever screws into the pump (That nut with the cross shape slots) something is not catching and so the pump is not being engaged? I checked that and it seems to be connecting properly. However, it seems like it must be something like that because no fluid flows through the line when the hydraulics are engaged. The rod doesn't exactly flop around but it doesn't have the same resistance or catch in the same place as before. This is a used pump. I got this tractor from a junk yard. The hydraulics were supposed to work. They didn't and they had to give me two other used pumps before I got it to work.

What is involved with rebuilding a belly pump?

Help needed with hydraulics

lucanuse

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Anonymous-0

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Allan in NE

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mkirsch

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lucanuse

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