Re-install the shaft if it has slipped from its place. To inspect the drive shaft, remove the engine assembly from the shaft and look to see if the shaft is in its proper place. Trimmers can also vibrate when the connection between the flex shaft and the trimmer head is loose or worn. These flex shafts can start to vibrate when they wear out, or when they aren't properly lubricated. Most string trimmers have a flexible drive shaft installed in their shaft housing, even if the shaft is straight.
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Install the new drive shaft housing assembly by re-attaching it to both ends, tightening down the bolts and screws, and re-attaching the ignition wires and throttle cable. Transfer any handles, guards or anything else off the old drive shaft housing to the new drive shaft housing. Remove the shaft from the gear box housing by unbolting it and pulling it apart. If needed, detach the throttle cable and ignition cable and pull apart.
To replace the drive shaft unit, separate the drive shaft from the engine assembly by removing the screws attaching the shaft housing to the engine. You may even hear a noise in the damaged spot when in operation, further indicating you have a problem. If you notice any damage impacting the operation of the flex shaft, it needs to be replaced. Inspect the flex shaft housing for damage. If the housing has become damaged and is rubbing and/or applying pressure to the flex shaft, it can cause a vibration. The housing for the flex shaft secures and supports the shaft as well keeps debris away from it that could impact its operation. Re-install the flange and the trimmer head, keeping in mind that the threads are reversed. Install the new gear box and rotate the spindle until it lines up with the inner shaft, then tighten down the bolts. Remove the trimmer head by rotating it counter clockwise trimmer heads are reversed-thread. On some models, you might have to lock the screwdriver in place against the washer, after it is locked inside the hole. Rotate the trimmer head until the screwdriver locks into place. Insert a screwdriver into the hole on the gear box located just above the trimmer head. To remove the gear box, remove any covers on the head that stop debris from flying if they are in the way. A grinding noise from the gear box is a good indicator of this problem. The teeth may break off the gears, throwing their balance off and causing your trimmer to vibrate. These gears can wear down over time from heavy use and a lack of lubrication. The gear case or gear box is located at the bottom of the drive shaft and transfers power from the drive shaft to the trimmer head.
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