13. REAR WHEEL/SWING ARM/ HYDRAULIC BRAKE Mongoose/KXR 90/50 Brake Drum Cover Inspect the driven sprocket. Replace sprocket if more than 1/4 teeth wear or bent teeth. Replace it if the brake disk is cracks or damage. Replace it if splines of the brake disk is wear or damage. Splines Inspect rear axle hub. Oil Seal Distance Collar Replace it if bearing allow play in the axle hub or the bearing turns roughly. Replace it if oil seal is wear or damage. Replace it if rear axle hub is cracks, bend or damage. Bearing and oil seal replacement steps: Clean the outside of the rear axle. Remove the oil seal by a flat-head screw driver. Bearings Oil Seal Place a wood block against the outer edge to protect this edge. Remove the bearing by a general bearing puller. Install the new bearings and oil seal by reversing the previous steps. Do not strike the center race or balls of the bearing. Contact should be made only with the outer race. 13-8