826 MCV behavior

Bradford · Sep 11, 2011

I've had my 826 for about two years and the mcv valve was never right. I would get pressure for the brakes and circulating through the tranny but the steering was getting nothing. No leaks anywhere. All of a sudden the steering is getting pressure, I can turn it with one finger, but it is leaking hydraulic oil from it seems the clutch bell housing and under the transmission. It leaks about a gallon over 4-5 hours. Any ideas?

Owen Aaland · Sep 11, 2011

(quoted from post at 13:23:03 09/11/11) I've had my 826 for about two years and the mcv valve was never right. I would get pressure for the brakes and circulating through the tranny but the steering was getting nothing. No leaks anywhere. All of a sudden the steering is getting pressure, I can turn it with one finger, but it is leaking hydraulic oil from it seems the clutch bell housing and under the transmission. It leaks about a gallon over 4-5 hours. Any ideas?

The steering has priority for the first three gallons of flow from the MCV pump. This flow has to go either through the steering system or bypass at the steering pressure relief valve. You know the flow is present because you have pressure for the brakes and TA lube.

My guess your problem is either the oil is bypassing the steering relief valve located in the bottom of the MCV or the steering pilot valve is sticking. The pilot valve is located on the top of the clutch housing. If your leak is from the top of the clutch it may leaking at the pilot valve and could explain a change in the steering when the leak began. A more common place to leak is the IPTO gear seal in the front of the TA. If the amount of oil leaking changes depending on which TA range you are in most likely the sealing rings and carrier sleeve are worn in the TA and the oil leaking there is just too much for the seal to stop.

Bradford · Sep 11, 2011

Thanks Owen,

Now that I think about it, i was shredding yesterday and it didn't freewheel going downhill when it used to. I'll pull the T/A back and see what happens next time I use the tractor. Can't see changing the T/A at this point because it runs so good and steers like a dream. I will look at rebuilding the T/A next though.

Curtis (my login is Bradford)

Bradford · Sep 11, 2011

Rebuilding the MCV next though is what I meant to say.

Curtis

Bradford · Sep 11, 2011

One more reply. I don't think it is the pilot valve unless it has a passage into the clutch housing because there is no oil from the top of the tractor just the bottom of the clutch housing and the clutch inspection window weeps a little. I hope the oil doesn't saturate the clutch and ruin it. I am thinking I better rebuild the MCV sooner than later.

Thanks again.

826 MCV behavior

Bradford

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Owen Aaland

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