Hydraulic Leak

[ldegraw30]

I have a 1974 John Deere 510 Loader/Backhoe that's been a 3 year project. Finally got it running and everything functioning. Replaced a bunch of leaking hydraulic hoses and am down to one last, significant leak. The vertical hard line in the attached picture connects to a junction block via a threaded adapter. The adapter has a small o-ring that's supposed to seal the block to nipple. I have both the 510 service and parts manuals. I ordered and installed the correct John Deere o-ring, but it still leaked. I tried a slightly larger than oem o-ring; still leaked. I tried a metal washer with rubber center in place of the o-ring; no luck. Can anyone give me other ideas how to get a good seal? The leak is bad enough that it can't be ignored.

Thanks in advance!

 

[matthies]

Try a new fitting.

 

[Jim.ME]

Clean the area with brake cleaner or such and be sure it is dry. Run it and see if you can track the leak. I have seen a leak from a cracked, poorly seated line migrate down a fitting and look to be leaking around the fitting. Not saying it is your problem but needs to be checked.

 

[ET]

There may be a hairline Crack it the steel line. They are known for cracking in the flare

 

[ldegraw30]

Thanks guys. I'll have to take a closer look at both components.