Originally Posted by Popcorn (Post 2927261)

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

Originally Posted by macafee2 (Post 2927262)

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in the cylinder wall and inch or so long, as if an internal cutting lathe tool was wound out instead of in and then withdrawn from the cylinder.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

Originally Posted by Ducati750cc (Post 2927269)

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

Originally Posted by Popcorn (Post 2927270)

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 :duh:
Hydraulics don't like scores piston or cylinder probably find its toast

Originally Posted by macafee2 (Post 2927257)

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

Originally Posted by Mike Noc (Post 2927300)

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