780ck unknown year

Kyle Mulvaney · Jul 6, 2022

So anyways got a smokin deal on two filters from the case dealer in bc only 300$ for two ! Maybe I should have bought some shovels and put my family to work LOL THEN 130$ for the seal kit howah ! I’m digging deep here !

Kyle Mulvaney · Jul 11, 2022

Tinkerer said:
The return line has nothing to do with a cylinder seal leaking.
A cylinder on good shape can blow the relief valve in the circuit and never drip a drop of oil.
The Case dealer will be stupid expensive for that seal kit.
If your old filter isn't damaged or toooo dirty use it long enough to get your hole dug.
I saw several on-line vendors offering that filter for sale.

I just got this I have worked on some hydraulic stuff on machines but not quite this old like bobcats mini hoes so is the relief valve something that packs up ? Or do the usually last for sometime , how would I check to see if it’s still functioning properly? Is it like a hot water tank relief valve ? Can u pop it to test it or is it a closed fitting ?

Tinkerer · Jul 11, 2022

Relief valves are mostly trouble fee.
There are ways to to test them. Unless you are having problems there is no need to worry about them.
Every time a hydraulic cylinder is dead ended, or the rod if cannot move under extreme pressure the relief valve opens to protect the system.

Kyle Mulvaney · Jul 11, 2022

Thanks ,I’m waiting for the seal kit for the dipper cylinder on the hoe I seen a video on how to put them in , like I said I’ll try to get some pics and thanks for your feedback !

Tinkerer · Jul 11, 2022

You will need a tool to fold the gland seal and a gland wrench. IMHO !
https://www.amazon.com/NOTETOUPT-Hy...hvlocphy=&hvtargid=pla-4584207594804504&psc=1

Kyle Mulvaney · Jul 20, 2022

Ya finally got my seal kit still waiting on the filters would you happen to know any dealers that have that hydraulic filters I’m looking fo ? Just a few dealers would be a good start thanks

Kyle Mulvaney · Jul 20, 2022

Would it be a bad idea to run the hoe after I replace the seals or would it be better to wait until I change the filter it’s old so the hydraulic oil is pretty nasty ?

Tinkerer · Jul 20, 2022

Go ahead and use it with the filters you have in it.
Call Dale or Debbie at ----->http://e-backhoeparts.com/
They are as cheap as anyone.

Welder Dave · Jul 20, 2022

Coming to Canada might be a pain. Go to places that repair heavy equipment or trucks that are filter distributors and see if they can cross the filters and get them for you.

Tinkerer · Jul 20, 2022

I have purchased quite a few parts form a retired Case dealer in Canada.
He still sells new old stock and he has boneyard where his dealership was.
He always sent everything through the post office.
It didn't take much longer to get parts from there than something sent from within the US.
I bought a used starting motor from him a quite while ago. It was delivered to the post office in the little town I live in. The box was wrapped with $90.00 worth of Canadian stamps !
His price for the starter was so cheap that it was still a good deal.
I always mailed him cash and never had a problem doing that.
He sends me parts before I put the payment in the mail.
Good Lord, I love honest people !

Welder Dave · Jul 21, 2022

Even ordering from the US. It is the best through the post office.

Kyle Mulvaney · Jul 22, 2022

Ok so I sent my post to the wrong conversation so I got my seal kit and removed the shaft off the dipper cylinder wow talk about overkill on metal anyway I’m posting pics to see if you can look at the end of the shaft , did the old seal kits have some kind of cloth or material in them or as my neighbour said they may not been able to get off the nut and jammed some belting under it or something?

Kyle Mulvaney · Jul 22, 2022

Thanks so much for your input it’s well appreciated!

Welder Dave · Jul 23, 2022

I doubt anything was jammed in it. Now it's apart you can properly fix it regardless. What do consider to be overkill? The cylinders have tons and tons of pressure and the backhoe puts even more stress on everything.

alrman · Jul 23, 2022

@Kyle Mulvaney Hi Kyle, we're here to help, but by posting same pics & in multiple threads - your going to confuse the hell out of us old farts....

Tinkerer · Jul 23, 2022

Kyle; you will need either the number that is stamped on the gland of the cylinder, or the tractor serial number so that you get the correct seal kit.
There are two different kits available for that cylinder.

Kyle Mulvaney · Jul 23, 2022

I actually talked to some rep on the phone before I ordered the kit ,gave him the year ser number and the lot ,and he sent me what looks like the right kit it’s just - there doesn’t look like there is any thing in the kit that has that cloth looking stuff could that be separate?

alrman · Jul 23, 2022

The seals on your cylinder could be 30 to 40+yrs old.
Seal makers in the 21st century probably use a different product that is more cost efficient to produce ..... & last a fraction of the time of the old school stuff.

Kyle Mulvaney · Aug 16, 2022

So my potlickin filters finally showed up and I got my cylinder kit in an reassembled , wow not really a walk in the park eh ! Anyways on a machine this old will it airlock or can I top up the hydraulic tank and run it ? Just wondering if it will get rid of the air in the system ? Thanks

Tinkerer · Aug 16, 2022

No, it will not airlock.
Be sure the air pressure is up tp at least 100 psi before using the hydraulics.
The hydraulic tank HAS to have at least 15 psi of air pressure in it to insure that the hydraulic pump has a continuous supply of oil.

780ck unknown year

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