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John Deere Tractors Discussion Forum
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Hydrolic Oil Change on JD 770

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Aaron F.

05-06-2005 07:11:13




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I have a John Deere 770 with a 70 front loader. I am planning on replacing one of the cylinders that has been leaking with a new cylinder. I am going to also change my hydrolic/transmission fluid and filter during this process to kill 2 birds with 1 stone. Is there any advice from anyone that has done this before ? I plan to follow the directions in my shop manual, but would like to hear any advice from someone that had done this before. Most of the process seems to be straight forward, but I'm wondering if I will run into a problem with having air in my lines afterward --- if so, is there a good method to remedy this problem. Thanks in advance for any advice given.

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F-I-T

05-06-2005 07:28:51




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 Re: Hydrolic Oil Change on JD 770 in reply to Aaron F., 05-06-2005 07:11:13  
Aaron:

About all I can offer is to use the fluid and filters recommended by your manual and dealer. Don't skimp. That's a nice tractor and it will last a long time if you keep it clean, well oiled and serviced.

On getting the air out of the lines, once repaired if you just cycle the loader through all of its range of motions, the air should purge and be replaced by oil. Once you do that, you'll have to check the oil level and refill.

On the leaky cylinder, do you have to replace the entire cylinder? Most have replaceable seals that make it much less espensive than replacing the entire cylinder. Your dealer can probably repair that cylinder in under an hour of labor for you. Unless of course it is cracked.

Frank

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Aaron F.

05-06-2005 10:54:06




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 Re: Hydrolic Oil Change on JD 770 in reply to F-I-T, 05-06-2005 07:28:51  
Frank --- Thanks for the quick response. I figured it would be pretty straight forward --- I just thought I could have a problem with air in the lines and not know the best way to get it out. How can the air "purge" itself from the lines without fluid coming out either? I thought I might have to loosen some of the connections to the cylinders in order to get any air out of the system, but it is a real relief to know that I may not need to do that. Putting a new cylinder on is probably more of a matter of convenience than anything else. It seemed like the John Deere dealers in my area didn't know if you could get a rebuild kit for the cylinders on a 70 loader or even if their shops would do the rebuild job anyway. One dealer told me that they didn't make a rebuild kit for the 70 loader cylinders. I'm going to replace it with a new one and then see if I can get a rebuild kit --- that way I can send it off to be done and not have to be without the use of my tractor --- and I'll have an extra cylinder if the other goes bad.

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And as for the air....

05-06-2005 13:03:27




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 Re: Hydrolic Oil Change on JD 770 in reply to Aaron F., 05-06-2005 10:54:06  
Sorry....See when you cycle the loader and the piston in the cylinder puses all the way one direction it pushes the oil all the way out (except for a little bit in the end of the tube and then in the lines) and then you goe the other way the same thing happens, and you keep repeating this, and during the idle times, the bubbles that made their way in the flurry of rushing oil to the sump rise to the top and bubble off leaving air-free oil, so that's how the air purges. Now in a closed system like a diesel fuel injection system, that's a different story. There you have to bleed the air off.

Frank

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Aaron F.

05-06-2005 13:26:07




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 Re: Hydrolic Oil Change on JD 770 in reply to And as for the air...., 05-06-2005 13:03:27  
I sure do appreciate the insight you've provided. I've been a little concerned about getting into something that might be a little over my head, but hopefully it'll just be a routine fluid change. Thanks again.



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F-I-T

05-06-2005 12:52:01




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 Re: Hydrolic Oil Change on JD 770 in reply to Aaron F., 05-06-2005 10:54:06  
third party image

Yup. There is a separate seal kit for both the boom and the bucket cylinders. I've entered a link to the illustration from JDPARTS. Sorry if it comes out large, but you can see that all you have to do is remove a snap ring from the front and then take out the pieces.

Now I don't know what your dealer charged you for a replacement cylinder, but according to the price that my dealer posts for those parts through JDPARTS, either the boom or the bucket cylinder are in the neighborhood of $500, and the seal kits are $40 for one and $50 for the other. I would be happy to help guide you through installing one through the use of e-mail or a phone call or two.

I just hate to see you spend money on something that is not necessary, and a dealer that does not know that a hydraulic cylinder is repairable is not much of a dealer. Also, there is probably a hydraulic shop in your area that can do the job in 20 minutes. I'm a klutz and I do them all the time.

Feel free to e-mail me if you need a hand.

[email protected]

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Aaron F.

05-06-2005 13:35:00




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 Re: Hydrolic Oil Change on JD 770 in reply to F-I-T, 05-06-2005 12:52:01  
That sounds great Frank. Is there a particular part # for the seal kit ? The cylider that is leaking is the boom cylinder.



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F-I-T

05-06-2005 14:16:20




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 Re: Hydrolic Oil Change on JD 770 in reply to Aaron F., 05-06-2005 13:35:00  
The boom cylinder seal kit that I found for the 1 1/2" AM118274 lift or boom cylinder is AM118391 and it is priced at $37.27 by my dealer. Your dealer's price may vary, and over the counter is generally lower.

Frank



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