IH 1050A loader leaking down

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IH 1050A loader leaking down

Postby toehead » Thu Dec 13, 2018 10:52 pm

My 1050A loader will leak down quite quickly with a full bucked of dirt, so much I need to keep a hand on the controls and bump it every once and a while when I am driving.

it leaks down on both lift and tilt.

Any pointers for determining if it is the spool valve or the cylinders themselves?

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Re: IH 1050A loader leaking down

Postby Steve Butram » Fri Dec 14, 2018 6:42 am

Can you adjust the pressure relief valve
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Re: IH 1050A loader leaking down

Postby Eugene » Fri Dec 14, 2018 8:27 am

Single acting hydraulic system, so not cylinders. Cylinders would be leaking hydraulic fluid on the ground. - - - - Edit. And then the hydraulic reservoir would be continually be low on oil.

Another edit. Does the tractor have an external hydraulic pump?
Last edited by Eugene on Fri Dec 14, 2018 10:08 am, edited 1 time in total.
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Re: IH 1050A loader leaking down

Postby outdoors4evr » Fri Dec 14, 2018 8:50 am

Your valve is probably allowing fluid past the valve. Another think to check for is air in the lines.
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Re: IH 1050A loader leaking down

Postby toehead » Fri Dec 14, 2018 10:16 am

Steve:

Not sure, I will check. Although, it will also go down under its own weight: If I leave it at full height (empty bucker) and shut the tractor off, it hits the ground in about an hour.

Eugene,

Yes, the loader system is on a completely different reservoir and pump. It is also double acting on both the lift and tilt motions (each cylinder has a line going to it on both ends).

I don't seem to have too many leaks on the loader system: there are occasional drips, but nothing major. The resevoir is a little low. I will top it off.

Outdoors:
Any way to check to see if it is the valve? I am thinking it might be, since it bleeds down on all motions. Which is more likley, that all 4 hydraulic cylinders have bleed by or that the single valve does.

:tractor:

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Re: IH 1050A loader leaking down

Postby Eugene » Fri Dec 14, 2018 11:16 am

Does the bucket leak down or just the loader?
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Re: IH 1050A loader leaking down

Postby toehead » Fri Dec 14, 2018 11:21 am

The bucket will tilt forward and the loader will drop, so everything is leaking down.

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Re: IH 1050A loader leaking down

Postby Eugene » Fri Dec 14, 2018 12:19 pm

OK. Since this is a two way hydraulic system and both the loader and bucket drop -- and there are two control valves. Either both control valves leak or there is an O ring leaking in one of the loader cylinders and in one of the bucket cylinders.

To determine if and which cylinder is leaking, engine off, loader and bucket and loader on the ground. Disconnect and cap off both lines to the left side of the loader cylinder and the left side of the bucket.

Start the engine and raise the loader and bucket. Shut off the engine. If the loader and or the bucket leak down, the cylinder(s) on the right side are or could be leaking.

Engine off. Hook up the left side hydraulic lines and cap off the right side. Raise loader and bucket. Wait to see if the loader and or the bucket drop.

If the loader and bucket drop after these tests, control valves leaking.

Caps or plugs to block off the hydraulic lines are inexpensive.
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Re: IH 1050A loader leaking down

Postby John *.?-!.* cub owner » Fri Dec 14, 2018 3:03 pm

The bucket cylinders are one way, and since they are not leaking externally about the only way for them to drift down is for the control valve to be leaking, or possibly the pressure bypass. The only o-rings in the control valves are to prevent external leaks, the valves functions are controlled by very close machining. Likewise the pressure regulator unless the spring is weak, in which case it would also reduce lifting capability.

The bucket cylinder would be a 2 way cylinder, so it's leaking down can come from the o-rings in the cylinder leaking, or from the control valve being worn.
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Re: IH 1050A loader leaking down

Postby toehead » Fri Dec 14, 2018 8:50 pm

It has two way cylinders on both the bucket and the loader.

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Re: IH 1050A loader leaking down

Postby John *.?-!.* cub owner » Fri Dec 14, 2018 8:57 pm

2 hoses do not necessarily mean 2 way cylinders, the 2nd hose may be a return line for excess fluid stored in the cylinder that is pushed back into the reservoir as the cylinders go up emptying the reservoir. Does it actually put down pressure on the loader?
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Re: IH 1050A loader leaking down

Postby toehead » Fri Dec 14, 2018 9:10 pm

Yeah, I used it to lift the front up when I put it on jack stands to do the power steering conversion :)

It picked the whole thing up like nothing.

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Re: IH 1050A loader leaking down

Postby toehead » Sat Dec 15, 2018 1:39 pm

According to the IH parts diagram all the cylinders use the same seals and packing (Although they look to be NLA). I might just pull one apart and see how much it will be per cylinder to get new packing and seals.

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Re: IH 1050A loader leaking down

Postby John *.?-!.* cub owner » Sat Dec 15, 2018 1:46 pm

Sorry, so many people see 2 lines on a cylinder, and automatically think 2 way, but some of them were-returns that went back to the reservoir. That comes to mind, because I had one, a Farmall H with an IH model 30 loader.

As to sinking down on loader the only way I know of to tell what is causing it is to raise the loader, put a support under it and cap off a return line (going to far end of cylinder) to one cylinder (both directions), and remove the support. If it stays up that cylinder is leaking. If it sinks but slower, that one is leaking, but still another problem. Then do the other cylinder the same way. You have to cap the lines individually, not where they come together.

To test the valve, raise the loader and cap off lines going to near end of cylinders. Remove support and if it stays up valve is leaking.
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Re: IH 1050A loader leaking down

Postby toehead » Sat Dec 15, 2018 1:59 pm

I'm for sure not extremely experienced with hydraulics, so I appreciate the feedback and I am certainly learning from you folks.


This cub has had a pretty hard life, and these loaders are as rare as hens teeth.
I am hoping that once I pull this thing apart it is a relatively standard bore, etc so that I can scrounge up the parts to repair.


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