![]() The spindle is threaded on one end in order to mount the grinding wheel. The spindle is located inside the spindle box assembly. Reinstall the grinding wheel cover and then the handle. Pack the spindle housing with fresh grease and reinstall the spindle housing back onto the gear box housing and then reinstall the gear box housing back to the grinder. ![]() Reinstall the gear housing on to the grinder. Pull the gear off and install the new armature gear and reinstall the retaining ring or nut. To replace the armature gear, remove the retaining clip, or nut, holding the armature gear in place. Reinstall the retaining ring and then the bearing with a socket that only makes contact with the bearings inner race to avoid damage. Remove the retaining ring securing the woodruff key, making sure the woodruff key stays in place during installation. To replace the spindle gear, remove the bearing with a bearing separator or puller. Inspect the gears for any signs of damage that will cause a grinding noise. Remove the gear box housing from the grinder and then remove the spindle box assembly from the gear box assembly. The following procedure will vary slightly between all makes and models. To check the gears, remove the grinding wheel cover and the handle. Gears with broken, or missing teeth, will make a grinding noise. Next, reapply the tension springs onto the brushes and reinstall the lower cover. Reassemble the gear housing to the grinder and then reinstall the carbon brushes. Slide the armature back into the grinder. For the rear armature bearing, remove it with a bearing puller, or separator, and then install the new bearing onto the shaft using a socket that only makes contact with the inner bearing race. For the rear armature bearing, remove it with a bearing puller, or separator, and the retaining ring or nut. Reinstall the armature gear and the retaining ring or nut. Install the new bearing onto the shaft by using a socket that only makes contact with the inner race of the bearing to avoid damage. Using a puller, or a bearing separator, remove the bearing. Remove the armature from the grinder and then the retaining ring, or nut, on the front of the armature. For some models, the brushes are located on the side of the grinder, inside a cap. Move the tension springs to the side and pull the brushes out of the holders. Remove the lower cover and locate the brush holders. To replace a bearing on the armature, remove the gear housing from the grinder. There are also two bearings located on the armature: one at the front and one at the rear. Reattach the wheel cover and handle, followed by the grinder wheel, with flanges, and then secure the lock nut. Reinstall the spindle box assembly to the gear box assembly and then reinstall the gear box assembly to the grinder. Use a hammer to tap it in place and then repack with new grease. ![]() Place the new bearing onto the shaft and use a socket that only makes contact with the inner bearing race to avoid damage. There may be a second bearing on the lower part of the spindle, depending on the model and therefore, you will have to remove the retaining ring and the spindle gear to access the lower bearing. Method #2: Use a bearing puller, or a separator, to remove the bearing on the spindle shaft. ![]() Reinstall the wheel cover then reinstall the grinder wheel with flanges and secure with the lock nut. Make sure the woodruff key stays in place during installation. Reinstall the cover, or retaining ring, to hold down the bearing, and then install the woodruff key, with the spindle gear, and reinstall the retaining ring. Install the new bearing by hand, evenly, and pack with new grease. Once you have done so, clean out the grease then press out the bearing with your fingers. Once the gear is removed, there may be another retaining ring, or screws, securing a cover that holds the bearing in place, which will need to be removed to access the bearing. Method #1: Remove the retaining ring securing the spindle gear and then the gear with the woodruff key. Depending on your angle grinder, the next steps will vary as all makes and models are different. Take out the spindle assembly from the gear box assembly. Remove the gear box assembly from the grinder. To check and replace the bearings, remove the wheel cover and the handle. A worn out bearing will generate a noise, such as a rumbling, howling, grinding or growling sound and it can also have play in it, causing a vibration. ![]()
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