Rotary swing leaking?

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RAAAID
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Rotary swing leaking?

Post by RAAAID » Tue May 19, 2020 7:28 pm

Hey guys I just picked up a 450 with a slide backhoe attachment. The rotary swing leaks pretty good and id like to tear into it to see what it needs. Looking to pick up a service manual or advice if anyone has been through one before. It's leaking at the top and bottom where the boom attaches to the pivot. Not sure if it's just an o ring or something more severe.thanks

nelstomlinson
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Re: Rotary swing leaking?

Post by nelstomlinson » Tue Jun 02, 2020 9:28 pm

Mine starts leaking after about 10 minutes of use. Then I get out the big wrenches and big hammer and pound them tight and I'm good for another 10 minutes of digging.

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77 Ford
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Re: Rotary swing leaking?

Post by 77 Ford » Wed Jun 03, 2020 7:37 am

I find it is never just an o ring, you'll need to repack those cylinders, assuming it's coming from a cylinder and not a hose or fitting. The only special tool you need is to get the gland off, once you have that they are fairly simple to rebuild and parts are readily available. Here is one tip if you do, try and break the gland loose before you remove the cylinder it's much easier to let the machine hold it.
JD- 450C track loader
Serial #208336T

Jim B
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Re: Rotary swing leaking?

Post by Jim B » Wed Jun 03, 2020 8:45 am

The rotary swing cylinder was used on the 9300 series backhoe I believe. (The 9250 and 9400 used conventional ram type swing cylinders.) The parts catalog for the 9300 is John Deere publication # PC1235. It is available on line at https://partscatalog.deere.com/jdrc/nav ... ment/73761. It will give you an idea of how it is built and what is inside it for sealing. I am not sure how available parts are for those, Lavoy may have insight on the parts.

The current Operator's manual is JD publication # OMT42370 according to https://www.johndeeretechinfo.com/. There may be earlier ones with a different number.

I don't find a Service Manual shown for the 9300. You can email or call Lavoy and see what he has or can get you for manuals. He can likely do as well or better than Deere on price if he has a service manual. If he can't help you at the lower left of the johndeeretechinfo homepage is a help box. Click on that box and a phone number will come up you can use to call to talk to someone about your needs.

RAAAID
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Re: Rotary swing leaking?

Post by RAAAID » Wed Jun 03, 2020 9:04 pm

Thanks for the info. I'm hoping it's just an o ring. Where would I source parts for it? Would a model 93 be the same as the 9300?

RAAAID
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Re: Rotary swing leaking?

Post by RAAAID » Wed Jun 03, 2020 9:05 pm

77 Ford wrote:
Wed Jun 03, 2020 7:37 am
I find it is never just an o ring, you'll need to repack those cylinders, assuming it's coming from a cylinder and not a hose or fitting. The only special tool you need is to get the gland off, once you have that they are fairly simple to rebuild and parts are readily available. Here is one tip if you do, try and break the gland loose before you remove the cylinder it's much easier to let the machine hold it.
What's the special tool look like for the gland? Is it just a large nut?

RAAAID
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Re: Rotary swing leaking?

Post by RAAAID » Wed Jun 03, 2020 9:06 pm

77 Ford wrote:
Wed Jun 03, 2020 7:37 am
I find it is never just an o ring, you'll need to repack those cylinders, assuming it's coming from a cylinder and not a hose or fitting. The only special tool you need is to get the gland off, once you have that they are fairly simple to rebuild and parts are readily available. Here is one tip if you do, try and break the gland loose before you remove the cylinder it's much easier to let the machine hold it.
What's the special tool look like for the gland? Is it just a large nut?

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77 Ford
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Re: Rotary swing leaking?

Post by 77 Ford » Fri Jun 05, 2020 7:05 am

It's basically an adjustable spanner tool to get to grab the pin holes on the gland. Then you put a 3/4" breaker bar in it to break them loose.
JD- 450C track loader
Serial #208336T

Jim B
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Re: Rotary swing leaking?

Post by Jim B » Fri Jun 05, 2020 4:44 pm

Did you use the link I posted to look at the 9300 backhoe? Does that look like your rotary swing cylinder set up? If so I don't believe you need a gland wrench. The gland wrench is used to turn the gland, a cylinder rod passes through, in and out of the barrel of an inline cylinder. I may be wrong but I don't see a gland called out for your rotary cylinder in the parts book. The boom, dipper and bucket cylinders likely need a gland wrench to service them.

Here is a link to the parts catalog for the 93 backhoe (PC864). https://partscatalog.deere.com/jdrc/nav ... ment/68752 Note that it covers several models (93, 93A, 94, 94A, 95, 95A) so read the headings closely and watch for serial number breaks (see if your model tag has a serial number on it. The rotary swing cylinder is similar to the 9300. According to JD tech publications the current Service Manual is publication # SM2062 (covers 93, 93A, 94, 94A, 95, 95A backhoes) and the Operator's manual s OMU40033 (covers 93,95 backhoes). Check with Lavoy he may be able to get these for you.

With part numbers Lavoy may be able to help you, check with him first. A John Deere dealer can if they don't hall in the NLA (No Longer Available) category. A good hydraulic repair shop may be able to match some things.

RAAAID
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Re: Rotary swing leaking?

Post by RAAAID » Fri Jun 05, 2020 5:21 pm

Thanks Jim. Ya mines a model 93 I'm pretty sure. Problem us there's no tag on the attachment but I did find a small 5 digit tag on the rotary cylinder itself. If I remember right the differences in the models is some are fixed while others have a mount that allows the backhoe to be slide from side to side. I'm going to see if I can find a parts and service manual for it. Maybe I can get a better understanding of how it's put together.

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