Cylinder Seal Kits for Kubota Backhoe BH75

[Mike-Kubota]

Maybe this catalog from Hercules will you help a bit more. Basically shows the various seals available and a cross section of it, which should help identifying them.

Is there a link to what you are mentioning here, ptsg? (I am not seeing one, but may not know where to look!)

 

[Mike-Kubota]

I have bought seals for my B21 TLB from eparts - I would get the seal kit part numbers you need and send them a note.

About us
Roger Wasson
605-403-0120 | rogerw@eparts.shop
Hudson, SD 57034 | www.eparts.shop

Thanks Carl, I will give them a try! Much appreciated!

 

[ptsg]

Is there a link to what you are mentioning here, ptsg? (I am not seeing one, but may not know where to look!)

Well, there should have been a link there but fat fingers over here never posted it.

Here it is: https://herculesus.com/skin1/catalogpdfs/2026 US Seal Catalog_low res.pdf

 

[dfkrug]

dfkrug - I am very much a novice at cylinder repair -- am able to replace the seals if I have a seal kit in front of me. Trying to find the individual seals in a catalog like Hercules seems very challenging to me at this point.

First, you have to get vernier calipers so you can take precise measurements. I have mechanical ones for both metric and inch scales, but you can get a cheap electric one that does both. Your hoe cyls will be metric, most likely.

Removing and measuring your seals is the next step. Note the shapes and configuration. As a minimum, you need to replace the rod-wiper, the rod seal inside the gland, and the main piston seal(s). You usually do not need to replace the rub-rings or the O-rings not subject to any wear, but do so if they are in a packaged kit or look questionable.

I like to measure the slots where the seals go, rather than the seals themselves. Sometimes there are backing ring(s) that make up 2 or 3 parts of a single seal. You will probably need a U-cup seal for the gland, and a sliding seal for the piston.

I know it seems daunting the first time, but I figured it out without help, and before there were any online videos to watch.

There is a Special Tool you should get to put in the gland seal, but it is not expensive.

There are many many Utube vids now to give you guidance. Here is an engineer's perspective on how the seals work if you want to go a little deeper:

 

[dfkrug]

The video I linked above is not linkable, so search for "Mastering Hydraulic Cylinder Seals" on Utube if you want to see an engineer's perspective. I like how it explains the different shapes of seals and how they work, with CAD drawings.

Not everyone's cup of tea, but hey, once an engineer, always an engineer.

 

[Carl_NH]

Here's the listing of the Kubota PN's for your BH which you may already have but send this to eparts and see what they have

Part #7K501-13300 KIT SEAL Swing 2
Part # 7K501-22300
Part # 7K501-32310
KIT, SEAL (55X30
Part # 7K501-43300
KIT SEAL (60X30)
Part # 7K501-52300
-KIT SEAL Stablizer 2

 

[Carl_NH]

Here's the 7K501 13300 on ebay for $23 Pardon Our Interruption... I haven't looked for the others

 

[Mike-Kubota]

Well, there should have been a link there but fat fingers over here never posted it.

Here it is: https://herculesus.com/skin1/catalogpdfs/2026 US Seal Catalog_low res.pdf

Thanks, ptsg...

 

[Mike-Kubota]

First, you have to get vernier calipers so you can take precise measurements. I have mechanical ones for both metric and inch scales, but you can get a cheap electric one that does both. Your hoe cyls will be metric, most likely.

Removing and measuring your seals is the next step. Note the shapes and configuration. As a minimum, you need to replace the rod-wiper, the rod seal inside the gland, and the main piston seal(s). You usually do not need to replace the rub-rings or the O-rings not subject to any wear, but do so if they are in a packaged kit or look questionable.

I like to measure the slots where the seals go, rather than the seals themselves. Sometimes there are backing ring(s) that make up 2 or 3 parts of a single seal. You will probably need a U-cup seal for the gland, and a sliding seal for the piston.

I know it seems daunting the first time, but I figured it out without help, and before there were any online videos to watch.

There is a Special Tool you should get to put in the gland seal, but it is not expensive.

There are many many Utube vids now to give you guidance. Here is an engineer's perspective on how the seals work if you want to go a little deeper:

Thanks for the detailed reply, dfkrug... I need to get a new electronic caliper as my old one no longer works. I will be watching that video very soon... I feel like I have been operating like a trained chimp, in that I go through the motions of replacing the seals and putting the cylinder back together (and thankfully they all have worked!) but I have no idea as to what the various seals are doing... I am very interested in learning more to progress past the trained chimp stage... thanks again!

 

[Mike-Kubota]

Here's the listing of the Kubota PN's for your BH which you may already have but send this to eparts and see what they have

Part #7K501-13300 KIT SEAL Swing 2
Part # 7K501-22300
Part # 7K501-32310
KIT, SEAL (55X30
Part # 7K501-43300
KIT SEAL (60X30)
Part # 7K501-52300
-KIT SEAL Stablizer 2

Yes, I have sent them to Roger, awaiting his reply... I told him that I would buy all that he can put together, as I will eventually need them all...