John Deere M suction line

Jim Nauert · Dec 29, 2022

Im having trouble with foaming hydraulic oil in my M, pretty much determined its a air leak on the suction side. I have replaced the seal where the suction enters the rockshaft housing, some of the furrules on the line look suspicious, I ordered some from Deere but they are rubber instead of brass and dont look like they would even work. Does anyone know of a substitute or a solution on replacement

deeretails · Dec 30, 2022

Rubber is the correct seal for the connection at the base of the dash and at the pump. Just did one and it works fine.

Hay maker2 · Dec 30, 2022

only time that I have ever had the oil in the hydraulic foam up out of the reservoir is in the wintertime. Since the weather was well below freezing and the modern 10W oil is a detergent type of oil it absorbed moisture in the reservoir and froze.
Drain the reservoir, flush it out and fill with non- detergent oil.

Hotflashjr · Dec 30, 2022

I second this. My MT did this and I put in non-detergent oil and the issue stopped. I have found John Deere Hy-Gard to foam in the TOM systems on these tractors before as well.

M-MAN · Dec 30, 2022

The rubber olives are what is supposed to be there. They work fine.

If you are using HD oil get rid of it. It will foam. 30wt non detergent works better and leaks less.

Jim Nauert · Dec 30, 2022

Mine is an older M #11446
They look big for the fitting. Did you have to cut the brass ones off?

Jim Nauert · Dec 30, 2022

I have non detergent 10w as per manual. I had an M years
ago and never had this issue and thats the oil I have always
used

Jim Nauert · Dec 30, 2022

Do you have a part number? The ones I purchased are
M 1167T , I see another number, M 1040 T listed for a three piece pump conversation kit. The ones I bought are black not olive as stated in another reply.

Jim Nauert · Dec 30, 2022

The ones I bought are black, M 1167T
I see another number for the three piece pump conversion kit listed at M 1040T, would that be the correct number for mine? As I stated before the 1167T dont look like they will even go into the fitting

wore out · Dec 30, 2022

(quoted from post at 07:03:24 12/30/22) Do you have a part number? The ones I purchased are
M 1167T , I see another number, M 1040 T listed for a three piece pump conversation kit. The ones I bought are black not olive as stated in another reply.

''The ones I bought are black not olive as stated in another reply.''

In this case, ''olive'' refers to the shape (sort of) of the part, NOT it's color.

Jim Nauert · Dec 30, 2022

Mine look pretty round

M-MAN · Dec 31, 2022

Ah ha! I should have realized you were talking about an early one with plumbing pipes. Sorry about that.

You need # AM1151T which consists of the adapter, ferrule and nut if it is still available. The ferrule is # M1167T. The nut is M1166T.

You can find all these parts at your local hardware store or industrial supply house as they are plumbing items. You might get by with just a new ferrule. They make a ferrule puller or you can just carefully cut the old one off.

John Deere M suction line

Jim Nauert

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deeretails

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Hay maker2

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Hotflashjr

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M-MAN

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Jim Nauert

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Jim Nauert

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Jim Nauert

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