Carlton 7015 TX blowing hyd seals

[third rail]

My 7015 stump grinder blows hyd. fluid from behind the O-rings on the "cutter head speed" and "ground speed" adjustment knobs. When this happens I have to replace the O-rings on the removeable valve. The newly installed o-ring would last anywhere from a week to 2 weeks. Now they last a day or two.
Anyone else having this problem, or know what is causing this? the Hyd fluid was replaced and filters changed yearly. I use rubber, metric O-rings as specified by Carlton.

 

[Mowingman]

Mine did that. I found that it takes a special "hardened rubber" type o ring. If you are using an o ring that is kind of soft, then you have the wrong type, and it will not handle the pressures. I took mine to a hydraulic repair shop to get this figured out. Once I got the correct o rings, I never had another problem. None of the correct o rings were available at tractor repair shops, like our Kubota, JD, MF, or NH dealers. I only found them at the hydraulic shop.
Jeff

 

[third rail]

Mine did that. I found that it takes a special "hardened rubber" type o ring. If you are using an o ring that is kind of soft, then you have the wrong type, and it will not handle the pressures. I took mine to a hydraulic repair shop to get this figured out. Once I got the correct o rings, I never had another problem. None of the correct o rings were available at tractor repair shops, like our Kubota, JD, MF, or NH dealers. I only found them at the hydraulic shop.
Jeff

Thanks Mowingman!! I was buying these o-rings 19X24X2.5MM, online from monster fastener. Com. As they were the only vendor i found that sold metric o-rings. I will try to find another vender. Were the o-rings you got black rubber, or some other material, (Viton) or color? Thanks for your help.
Mark

 

[Mowingman]

They are black. They are not very soft at all, but really kind of like a hard rubber, ( but they may be made of some other material). The o ring is still flexible, but if you compare it to a regular o ring that you might get at a tractor dealership, you can tell it is much more stiff and dense. They are a special kind for high pressure hydraulic applications. The guy who owns the small hydraulic rebuild shop here, told me you will usually not find these type of hydraulic o rings, except at hydraulic repair shops. I even tried our Bobcat dealer, and they only had the soft ones. I was about to pull my hair out, until I got with this hydraulic repair guy.
Hope this helps,
Jeff

Thanks Mowingman!! I was buying these o-rings 19X24X2.5MM, online from monster fastener. Com. As they were the only vendor i found that sold metric o-rings. I will try to find another vender. Were the o-rings you got black rubber, or some other material, (Viton) or color? Thanks for your help.
Mark

 

[third rail]

They are black. They are not very soft at all, but really kind of like a hard rubber, ( but they may be made of some other material). The o ring is still flexible, but if you compare it to a regular o ring that you might get at a tractor dealership, you can tell it is much more stiff and dense. They are a special kind for high pressure hydraulic applications. The guy who owns the small hydraulic rebuild shop here, told me you will usually not find these type of hydraulic o rings, except at hydraulic repair shops. I even tried our Bobcat dealer, and they only had the soft ones. I was about to pull my hair out, until I got with this hydraulic repair guy.
Hope this helps,
Jeff[/QUOTE

OK thanks. I will visit my local hydraulic shop. It is frustrating when the plume of hyd oil sprays onto a customers driveway or walkway! My local dealer called Carlton so i could be sure i was using the right size o-ring,(which i was not). He never mentioned the hardness. Makes perfect sense now. Thanks again for the insight!
Mark

 

[Mowingman]

one more thing I thought of. When you get the correct o rings, they will have a "harder feel" when you tighten the connection down onto it. I can not tell you how tight to go, but you just need to give the fitting a good "snug' tightening. Don't over tighten and really mash that o ring. Again, this is just kind of a judgment thing.
Jeff

 

[Eq Broker]

Hi Mark,

You need a 90 durometer o'ring and the 90 indicates the hardness of the o'ring.

Hope this helps!

Dave
Global Equipment Exporters

 

[third rail]

Hi Mark,

You need a 90 durometer o'ring and the 90 indicates the hardness of the o'ring.

Hope this helps!

Dave
Global Equipment Exporters

Thanks Dave, I went to my local Hydraulic shop, Steward-Hunt, as Jeff suggested. They were kind enough to hook me up with a half dozen O-rings that are definitely stiffer than the ones I had been using. It doesn't seem as though anyone rates O-rings with a durometer spec. that I could find. I'm sure this will cure the isuue I was having with the fluid spraying out of the manifold (block). I will report back in a week or two. Again guys, thanks a lot for your help. -Mark

 

[third rail]

Well, its been 3 weeks and over 60 stumps and no hydraulic fluid spraying out of the back of the machine. The harder O-rings was the solution. Hope this thread helps someone else with a carlton grinder... Mark

 

[Alfreda]

My 7015 stump grinder blows hyd. fluid from behind the O-rings on the "cutter head speed" and "ground speed" adjustment knobs. When this happens I have to replace the O-rings on the removeable valve. The newly installed o-ring would last anywhere from a week to 2 weeks. Now they last a day or two.
Anyone else having this problem, or know what is causing this? the Hyd fluid was replaced and filters changed yearly. I use rubber, metric O-rings as specified by Carlton.

"Got it checked with a hydraulic repair specialist , once got the correct o rings & fixed them, not facing the problem again."

 

[howel07264]

My 7015 stump grinder blows hyd. fluid from behind the O-rings on the "cutter head speed" and "ground speed" adjustment knobs. When this happens I have to replace the O-rings on the removeable valve. The newly installed o-ring would last anywhere from a week to 2 weeks. Now they last a day or two.
Anyone else having this problem, or know what is causing this? the Hyd fluid was replaced and filters changed yearly. I use rubber, metric O-rings as specified by Carlton.

This is common on the Carltons. For my TRX I keep a box of #6 buna black O-rings and they usually last about 12 months.

 

[2treeornot2tree]

Anyone know what diameter they are?

 

[2treeornot2tree]

The o ring is a #10 boss o ring.