H with 31 loader

B T Riordan · Apr 26, 2009

I drained the oil (and water) out of the pump on the 47 H. Put in 6 qts of non-detergent oil and now it won't lift the loader over 2 feet! So I thought I'd better check with you-all before I screwed up anything worse. Do I need to put in additional oil to compensate for the volume of the cylinders? Put the water back in? If more oil is needed, how much should I add? Anything else this could be? What do you-all think?

Thanks!

Andy Motteberg · Apr 26, 2009

Hydraulic oil works well. On the H loader, you need to fill up the top of the loader cylinders with oil. There should be a plug up there next to the hose or line that goes back to the belly pump filler. Does your loader have hoses or lines that go from the top of the cylinders down to the belly pump filler? If not, you need that.

B T Riordan · Apr 26, 2009

Thanks! I've got the hose and plug. Any idea how much it will take to fill cylinders? Relieved it's no more than that!

Brownie 450 · Apr 26, 2009

On our SMTA with a #31 loader, the original cylinders only have hoses at the front of the cylinders to return oil which has gotten by the packings back to the reservoir.

mkirsch · Apr 26, 2009

B T, just keep refilling the reservoir until the cylinders will raise fully. When you lower the loader, the excess will push out the fill pipe and into the tops of the cylinders.

rustyfarmall · Apr 26, 2009

Yes! Exactly. Just keep adding to the reservoir until the loader goes all the way up.

Andy Motteberg · Apr 26, 2009

Not exactly sure how much, my H held a lot. Just keep on filling them til the loader can go all the way up.

Roger46 · Apr 26, 2009

I have had a model 31 loader for many years and used it a lot. I also bought an H for my son that had a 31 loader on it. I am amazed at how they work as I have never seen another loader designed like that with a cylinder setup like that. I fill mine with oil until the loader just goes to it's maximum height which is more than 6 quarts. As someone else said, the return hose on the cylinders is to return oil that leaks past the pistons. On my son's loader we just used some plastic tubing for those lines. You can't fill the hydraulic reservoir too full or oil will leak out the breather cap and you need a breather cap for fluid expansion. Roger

mkirsch · Apr 27, 2009

Roger, the vented cap is for operating small one-way cylinders. The level of fluid changes in the reservoir, so you need to let air in and out or the system will vapor lock on you.

When you have an auxiliary reservoir or you are using two-way cylinders, you are supposed to replace the vented cap with a sealed cap.

The cylinder tops on those old loaders are auxiliary reservoirs. They are NOT two-way cylinders, so using low-pressure tubing is perfectly fine. Even garden hose is fine if it stands up to the oil.

You said it yourself, it takes MORE than 6 quarts to raise these loaders all the way. The belly pump only holds 6 quarts. Where do you think the excess oil goes?

H with 31 loader

B T Riordan

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Andy Motteberg

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B T Riordan

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Brownie 450

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mkirsch

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rustyfarmall

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Andy Motteberg

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Roger46

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mkirsch

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