Center joint (swivel joint) seal kit for CAT E300 / E450 / E650 / MS300-8 / EL300 series — stops cross-port leakage between upper structure and undercarriage.

Complete radial and axial seal set for the rotary hydraulic swivel that passes oil from the upper structure to the travel motors and track adjusters. Cross-referenced to original Caterpillar factory part numbers.

Kit contents:
- Radial shaft seals (NBR/PU)
- Axial face seals
- Static O-rings
- PTFE back-up rings
- Wiper / dust seals

Symptoms of failure:
- Sluggish or one-sided travel (often mistaken for motor failure)
- External oil leak at swivel base
- Cross-contamination between upper and lower hydraulic circuits

Diagnostic tip: Cross-port leakage in the center joint often looks like pump or motor failure — but costs a fraction to fix. Always inspect the center joint before condemning expensive components.

Fits CAT E300 / E450 / E650 / MS300-8 / EL300 series.

Stocked in Surrey, BC. Same-day dispatch on orders placed before 2 PM PST.