Discussion:
Lift cylinder seals

Hi all, I have just replaced the seals on the two lift rams (might have heard this model referred to as pencil rams ?)
Anyway, they (or one of them so far) are leaking already. I lifted something near max capacity and they were ok but later, under light load or just unloaded I heard a noise and there was a leak.
The rods are in good condition.
I bought the seals from a hydraulic place not from Manitou by measuring the old seals (which obviously were leaking) and now I am wondering if the rams are an oddball size and the old ones were leaking for the same reason, i.e. wrongly sized, as they weren't really damaged ?
The rod is definitely 50mm. The seal external diameter, both what I removed and what I installed, is 60mm but is it possible/likely that this should be 61 or 62 ?
Thanks for any advice.
  • Posted 24 May 2025 17:56
  • Modified 25 May 2025 22:40 by poster
  • By John_Hubbard
  • joined 24 May'25 - 1 message
  • Poitou Charentes, France

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