fspring

Member
Got a 7710 in the shop. Put new hyd pump
on it. It's leaking out of the banjo bolt
that goes through the block at thseal???
End of the tube above the pump. I didn't
see any sealing washers or o rings when I
took it apart. The parts book online
dosent show any either. How do you get it
to seal???
 

If your talking about the line that runs from the pump up to the oil cooler it does have seals
The lines and seals are in the transmission section, FIG. 7C1
87032-S94 o-ring
D2NN-B997-A seal
 
I think he's talking about item 48 in this diagram.

https://www.mycnhistore.com/us/en/newhollandag/tractors/agricultural/naba01agr01010series/4-cyl-ag-tractor-flat-deck-10-series/hydraulic-systems/hydraulic-pump-assembly/cn/9752C5C9-B8BF-E111-9FCE-005056875BD6/1FFD724F-E6BE-E111-9FCE-005056875BD6

I've had trouble with those as well. No seals or washers. I tried adding copper washers but had no luck. The only fix I found was a new fitting and bolt, which came as one part number as I recall. Looks like they are NLA.
 
From factory there was a sealing washer of some kind between the banjo fitting and the axle housing, even though the parts book does not show one. It wasn't copper or aluminum, so it must have been some sort of soft or mild steel. Take the fitting to a hydraulic shop and explain the problem. Good chance they might be able to send you home with something that will work.

Otherwise, I'd look into replacing the elbow with a more conventional JIC or ORS 90-degree fitting. The end of your tube would have to be modified of course to mate with it.
 
It's not leaking on the transmission side but on the banjo bolt head side. I put some loctite 515 on the back to see if that will seal
it up. Haven't tried it yet. Want to let it cure 1st...
 

I take it a sealing washer won't work.

https://www.mcmaster.com/sealing-washers/pressure-rated-metal-bonded-sealing-washers/
 

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