hydraulic pipe leak - JD 6620 combine

andy r · Oct 30, 2017

Over the years I have had to replace a couple hydraulic pipes on my John Deere combines due to leaking. I think the leaks were always near a fitting on something like a cast valve body. I noticed the feeder house was all oily today and looked under the cab at the main valve and saw some oil dripping. When we quit I laid on the feeder house and stuck my head under the cab to take a closer look at the main valve. I could see where it was leaking. I loosened and re - tightened the compression fitting. Pipe has a double flare. Didn't help. Might have made it worst. I assume there is a crack at or near the end of the pipe. Problem is I can't see a crack. It is possible to have a hairline crack and not be able to see it with the naked eye?????? Thanks.

retired farmer · Oct 30, 2017

It is possible. Had one this summer. Just replace it with a hose assembly.

Brown Swiss · Oct 30, 2017

4520BW · Oct 30, 2017

The steel line is probably cracked, retired farmer is right just have a hose made.

Steve@Advance · Oct 30, 2017

Every flare fitting I have had to leak was cracked. Sometimes you can see it, sometimes not.

Caused by stress and/or vibration. If you can replace all or some of it with a hose assy, all the better.

JMS/.MN · Oct 30, 2017

Sometimes they"re so small you can"t see them, but rub your fingernail over the flare...may feel it catch. That"s the crack. I"ve brazed steel lines with a longitudinal crack, but flare cracks cannot be fixed.

Replacing it with a hose is a good idea...takes care of the vibration. Lines need to be clamped solid within a few inches of the fitting, hoses don"t.

stonerock · Oct 30, 2017

leave it on and braze it!!

hydraulic pipe leak - JD 6620 combine

andy r

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retired farmer

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Brown Swiss

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4520BW

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Steve@Advance

Well-known Member

JMS/.MN

Well-known Member

stonerock

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