Oil seal, your thought please

[macafee2]

what are your thoughts on the cause of the crinkling of this oil seal? It is on my trolley jack and is probably the reason for it leaking.
I'm quite chuffed at working out how the trolley jack came apart.

Thank you

macafee2

[Popcorn]

Is the piston scored if so dirt/grit will have worn the seal also how old is the jack old rubber degrades

[macafee2]

Originally Posted by Popcorn

Is the piston scored if so dirt/grit will have worn the seal also how old is the jack old rubber degrades

jack is 4 - 5 years old at a wild guess but it could be 10.
There is one heck of a score in the cylinder wall and inch or so long, as if an internal cutting lathe tool was wound out instead of in and then withdrawn from the cylinder. Your post has made me wonder, does the ram fully extend or once the seals get to the score, is fluid bypassing the seals?

macafee2

[Ducati750cc]

Originally Posted by macafee2

jack is 4 - 5 years old at a wild guess but it could be 10.
There is one heck of a score in the cylinder wall and inch or so long, as if an internal cutting lathe tool was wound out instead of in and then withdrawn from the cylinder. Your post has made me wonder, does the ram fully extend or once the seals get to the score, is fluid bypassing the seals?

macafee2

Has the oil ever been changed or topped up, if so what with ?

[Popcorn]

The score will be the cause of the leak, is it the main ram that is leaking or the pump ram.
Got to have a look at my jack also last time I used it had a puddle of oil luckily jacked the car up enough to get the stand out
Hydraulics don't like scores piston or cylinder probably find its toast

[macafee2]

Originally Posted by Ducati750cc

Has the oil ever been changed or topped up, if so what with ?

not that I recall

macafee2

[macafee2]

Originally Posted by Popcorn

The score will be the cause of the leak, is it the main ram that is leaking or the pump ram.
Got to have a look at my jack also last time I used it had a puddle of oil luckily jacked the car up enough to get the stand out
Hydraulics don't like scores piston or cylinder probably find its toast

The leak seems to be at the other end of the cylinder where the seal in the photos sit.

macafee2

[Mike Noc]

Originally Posted by macafee2

what are your thoughts on the cause of the crinkling of this oil seal? It is on my trolley jack and is probably the reason for it leaking.
I'm quite chuffed at working out how the trolley jack came apart.

Thank you

macafee2

Looks like poor quality rubber that has been degraded by the oil used to me Ian. What make is the jack?

[macafee2]

Originally Posted by Mike Noc

Looks like poor quality rubber that has been degraded by the oil used to me Ian. What make is the jack?

SGS TJ3, never thought much of the jack. It has never lowered the car, just dropped it. I have a new seal kit to fit.
This is a job I have been putting off as I had no idea how the jack came apart. In the end it was easy.



thank you all for your thoughts

macafee2

I've restored a couple of trolleys jacks in recent years. That looks to me like contaminated oil degrading the seal.