18. STARTING SYSTEM MXU 300/250 Check for continuity between the brushes. If there is continuity, replace with new ones. Bearing Check if the needle bearing in the front cover turns freely and has no excessive play. Replace if necessary. Check the dust seal for wear or damage. Dust Seal Commutator ASSEMBLY Apply grease to the dust seal in the front cover. Install the brushes onto the brush holders. Apply a thin coat of grease to the two ends of the armature shaft. Insert the commutator into the front cover. · Be careful not to damage the brush and armature shaft mating surfaces. · When installing the commutator, the armature shaft should not damage the Front Cover dust seal lip. 18-5