Fork Seals

Always the same side that goes first?

 

Bloody hell mate I wouldn’t be expecting to change fork seals once on a bike with only 10k on it let alone 3 times
Definitely something not right here
Assuming that you’re getting the correct seals then it could be incorrect fitting/worn or more likely pitted stanchions/too much oil in the fork?
3rd set of seals??? Definitely something not right mate

 

If they are bottoming out and banging on the seals on every bump you ma need to crank up the preload and increase the compression on the forks
As said, it could be too much oil causing hydro lock and this is blowing out the seals
Have they been modified with new springs or pistons, is the oil the correct viscosity?

 

IMO...Strip em down & start from scratch using Gen seals & oil. Check everything is correct & in place to the original spec.

If you don't know this area well, then i think i would deliver them to Clive woods / Maxton etc to sort out for you mate.

Hope you get it sorted soon.

 

Keep the front wheel off the ground while not in use or at the very least upright for the winter always do this with modern/heavy bikes

 

Its not a common Triumph problem. What about environment?

 

All you have to do is cut a 4" length by 1" wide strip from a milk bottle and make a hook shape at one end, place on fork leg and push it up into the seal and do a full circle of the leg pulling down as you go, remove and job done. Common problem. https://www.amazon.co.uk/Seal-Mate-Leaking-Seals-Affordable/dp/B0120G110Y

 

Used these before with good results I think they were first used by moto x riders. When the forks go past the normal rate of travel it traps dirt under the seal resulting in a leak and not necessarily meaning the seal has blown. And with today's potholes it happens more often