Hoping for some help....

Hello everyone,
I recently purchased a Case/Davis 70+4 trencher with the D130 backhoe, anyway its leaking hydraulic oil from a "cap" of sorts located on top of the propulsion pump, please see the attached pictures (the first pick is looking down at the top of the "cap", the second pic I circled where the oil is leaking from, where the "cap" and pump meet.) I haven't been able to get any manuals and I found the parts breakdown on line but I'm having trouble locating this particular part or "cap". Can anyone tell me if there is an O-ring or a gasket under this part also if I take it off do I risk any unforseen problems? Also if anyone has the torque specs for the 4 bolts (2 hex head and 2 Allen wrench bolts) I would be very grateful!!! Thanks for any help!
Best regards to all.
Agman55 (Jeff)

First thing you need to do is blast that area off with some brake clean and get it completely dry and then reassess the leak. It is very likely that it is not leaking between that cap and the casting rather it is leaking between that lock nut and the hose adapter.
Either way it's a very straightforward fix.
You don't need to have torque specifications for the particular part, you need to torque it based on the size and grade of the bolt.
It certainly does not hurt to have a manual but you don't need it in this case.
Once you figure out which o-ring is leaking, you can go to a hydraulic supply store and get a replacement o-ring, once again not needing a part number.

Thank you Skyking, I thanks so much for the information, I always try to get manuals but just none to be had at this point in time so I really appreciate your input. I hate "assuming" things as well so if I'm not sure about something I will ask, even if I feel dumb doing so. Thanks again!

Also you may not have to replace anything if it is leaking from the area of that lock nut it could be that that nut is loose. What that does is clamps an o-ring and allows you to turn the fitting to point the hose in different directions. Frequently they are loosened by the vibrations on the hose.

Well I'm a bit stumped, I cleaned and dried everything off, I then replaced the O-rings on the fittings (behind the lockout and on the other end of the 90 degree fitting) but it's still leaking and it still appears to be leaking where this "cap" meets the propulsion pump. I've cleaned and dried the area several times and this seems to be the area that's leaking. I've looked for cracks on the pump and elsewhere but nothing is evident. It appears my only option is to remove the "cap" and see if there is an O-ring or gasket that is leaking. This leak sure is proving to be frustrating as all heck!

there will probably be an o ring under that cap also, possibly not the right one because those don't look like the original bolts.

The fitting going into the cap is called O ring boss, you can reuse that o ring by loosening the lock nut before turning out. Don't turn the fitting with the nut tight, it could tear the o ring. You may need the cap to size a new o ring, or take the old one and take your chances.

Thank you Skyking for the information, it is spot on! Unfortunately for me the leak is still not resolved.

Thank you Delmer, I have a huge assortment of both metric and standard size O-rings so that's not a problem. The problem is finding exactly where it's leaking, and it sure seems to be leaking under this "cap", so I'm going to remove it and see what I can find.