Hydraulic Cylinder Seal Identification - Pic

[allenr]

Pictured below is the seal and head gland from a 4" Barrel x 2" Rod x 60" Stroke hydraulic cylinder made in Australia by Collier & Miller.

There was a leak between the rod and the head gland so removed the gland seal with an idea of cutting a strip of thin perspex to spring into the seal reccess.

The seal wasn't as rubbery as anticipated and it broke while removing it. Dimensions are 2" ID x 2 1/2" OD x 1/4" wall thickness x 1/4" depth.

Can anybody identify what this type of seal is called - as you might see in the pics it looks a bit like a low pressure lip seal with an o-ring pushed in the gap but it is all one piece.

Appears to me the seal isn't as compliant as it might be and maybe lacks the proper lip to push out under pressure, but having said that I think it leaked worse when standing in the shed under no pressure.

Or is there an altogether better seal which could fill that 1/4 x 1/4" recess.

I've been thinking about a 1/4 x 2" ID x 2 1/2" OD O-ring but you don't often come across such thick O-rings - maybe for good reason?

 

[DieselPower]

1/4 inch o-rings are common but just not common in that small a size. The standard dash size 1/4 inch CS o ring starts with a dash size of 425 which is a 4 1/2 x 5 inch o ring. O ring suppliers can often supply smaller OD/ID o rings if needed.

You shouldn't have any problem finding a 2 x 2 1/2 x 1/4 oil seal. I pulled out my MSC catalog and they have numerous different types from loaded lip seals to radial shaft seals to different type of poly type and rubber seals. Just check out the MSC website, they should have something that should work.

 

[allenr]

1/4 inch o-rings are common but just not common in that small a size. The standard dash size 1/4 inch CS o ring starts with a dash size of 425 which is a 4 1/2 x 5 inch o ring. O ring suppliers can often supply smaller OD/ID o rings if needed.

You shouldn't have any problem finding a 2 x 2 1/2 x 1/4 oil seal. I pulled out my MSC catalog and they have numerous different types from loaded lip seals to radial shaft seals to different type of poly type and rubber seals. Just check out the MSC website, they should have something that should work.

Thank you Michael for sharing your knowledge.

There doesn't appear to be a MSC distributor in Australia but after looking a their website and noting one or two seals which seemed ideal, I was encouraged enough to search for Rod Seals on a couple Australian sites.


Came up with the following and have ordered a couple of those.

Welcome | Ludowici LudoWeb

 

[DieselPower]

Oops, I didn't even notice you were in Australia. Glad it was still of some help. Hope the new seals work out for you.

 

[Wayne County Hose]

It's a standard type loaded polyurethane U-seal. Very common, should be real easy to find down under. The extra piece in the middle is for low pressure sealing. Keeps the edges of the seal pressed into the bore and rod when there is low pressure in the cylinder. That's what the "loaded" part means. To aid in the installation, drop the new seal in a bowl of water and nuke it to about 160 degrees, then install it. Also, they are cheap enough so buy 2. That way in case you bugger one up, you have an extra to install.

 

[allenr]

The new seals arrived today - fitted them before reading Andy's advice, luckily it went okay.

Noticed some pitting on the shaft exactly where the wiper seal contacts.

Any ideas why that should occur and what could be done to avoid it getting worse.

I've attached some pics - ignore where a grinder seems to have removed the chrome further out.

Final pic shows the application, it does get wet now and then but I find it hard to believe that the chrome should be affected by that bit of moisture.