Thread: Mini excavator centre pivot/swivel help

Originally Posted by ZQLewis

You can also assume that it will be imperial O-rings.
They come in standard cross sections, 1.78mm 1/16" 3.5mm 1/8", 5.33 3/16", and 6.99mm 1/4", (Difference between metric and nominal Inch sizing is the crush)

Measure the ID based on the shaft and then pick a cross section that will make then snug in the outside of the grove.
You may need PTFE back up as well either side of the oring.

https://www.sealinnovations.co.nz/

Assuming imperial due to the age and most hydraulic stuff is imperial with the exceptions of cylinders on mobile plant Excavators etc from Asia/Japan.
Z

I wouldn't assume nada with it re. sizing. Not too hard to measure and confirm sizing though. Be aware those can be a bitch on reassembly for pushing a ring out of place and pinching it leading to oddball performance i.e. a second ram moving/creeping when it's not meant to through a leak into the adjacent gallery. Oring grease on the orings on assembly to help support them, copious amounts of oil to lube everything else and being careful to slowly and deliberately push things back into place to avoid unseating something...