Jinma lw 8 backhoe ordering replacements seals….over or under sized?

[DonRina]

In measuring my Jinma Chinese LW 8 backhoe hydraulic parts in order to find replacement seals I’m wondering where I place the slop of the measurements.

For example, gland nut o rings. I get 64.5 mm ID on the part and 70.15mm for the cylinder wall id. So would a 64mm I’d x 4mm t work? Similar issues for the feast of the parts. Can’t quite get to the measured sizes vs what’s available. Too bad kits are not available or info from others going down this path.

 

[oldnslo]

If you don’t have the original seals then Measure the glad or groove the seal goes in both width and depth along with seal dimensions. Then do a search for gland dimensions for O-rings in both static and dynamic operation. Parker and Apple Rubber both used to have decent websites but have not looked at either for a few years. This will provide you nominal dimensions for a given O-ring.

Seal squeeze will vary from static to dynamic