Junjin Spare Parts SEALING KIT J01806000

This J01806000 sealing kit is a direct-fit replacement for select Junjin hydraulic cylinders. It’s not a universal set—each seal matches the original groove dimensions and shore hardness.

Inside the kit you’ll find the rod seal, piston seal, wiper, and backup rings, plus a set of O-rings for the gland and piston. Everything is packed together in one labeled bag. No extra pieces, no guessing.

The rod seal is a polyurethane U-cup with a tighter heel section. It handles shock loads better than standard nitrile. The piston seal is a two-part PTFE composite with an elastomeric energizer, which keeps leak rates low even when the oil is cold.

We see these kits going into boom cylinders on Junjin excavators and log splitters. If your original kit number was J01806000, this replaces it exactly. No modification needed, no cross-referencing mystery.

When installing, lubricate all seals with clean hydraulic oil. Pay attention to the wiper lip direction—it faces outward. Store the kit in a cool, dry place until you’re ready to swap the old seals out.