Seat Leon >> Checking inner constant velocity joint


The joint is to be dismantled when following work is done:

  • Replacement of grease if very contaminated
  • Check of running surfaces for wear
  • Check of balls for wear
  • Swing ball hub and ball cage.
  • Push out joint body in direction of arrow.
  • Press balls out of cage.

Note Ball hub and joint body are paired. Do not interchange.

  • Tip ball hub out of ball cage via ball track -arrows-.
  • Check joint body, ball hub, ball cage and balls for small indentations (pitting) and traces of seizing

Excessive backlash in the joint will cause knocking or jolts under load change. In this case the joint must be replaced. Smoothing and traces of wear on the balls are no reason to renew the joint.


Carry out installation in the reverse sequence, noting the following:

Front suspension

  • Insert hub into cage via the two chamfers. The hub can be installed in any position. Press balls into cage.

The ball hub has two different distances between the ball sliding surfaces, one large and one small.

  • Fit the hub with the cage and the balls vertically in the cage element.

When fitting, ensure that the larger distance -a- on the joint housing coincides at all points with the smaller distance -b- on the hub after turning it.

Chamfer on internal diameter of ball hub (splines) must face large diameter of joint body.

  • Also take note of chamfer on interior diameter of ball hub. It must be visible after swivelling in.

  • Swivel the hub into the joint body; at the same time the hub must be swivelled out of the cage -arrows- far enough to allow the balls to fit into the ball tracks.

  • Press hard on the cage -arrow- insert turning the ball hub.

Checking function of constant velocity joint

The constant velocity joint is correctly assembled if the ball hub can be moved by hand backwards and forwards over its entire range of axial movement.

    Checking outer constant velocity joint
    The joint is to be dismantled to renew the grease if it is heavily soiled, or to check the running surfaces of the balls for wear and damage. Removing Before dismantling, mark position of ball ...

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