![]() ![]() ![]() 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. On 4 stroke and 2 stroke Air Cooled Combustion Engines Shutting them down right after use will cause a lot faster wear on the Pistons, Piston Rings and the Pistons Cylinder and all Bearings, Bearing Races, Seals and Bronze Bushings.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. The temperature of the Engine will actually increase before starting to cool down, This will cause the Motor Oil to quickly degrade and cause Valve Guides and Valve Stems to Wear out a lot faster on 4 stroke air cooled combustion engines. If you shut down any Lawn Equipment Air Cooled Combustion Engines right after running them under Load. I always let all my lawn equipments Air Cooled Combustion Engines run for at least 5 minutes not under any Load just above Idle Speed allowing them to Cool Down before shutting them down. You will greatly increase the life of all your Air Cooled Combustion Engines if you Follow this Simple Procedure. It Still runs as great as the day I purchased it. After 6 years t he Fuel Line is still very pliable and hasn’t needed to be replaced). Clean Air Filter regularly, replace Fuel Filter every year, Lubing the Shafts and Line Gear Head every 25 Hours of use.Cleaning the Spark Arrestor once a year,always keeping the Engine Clean. I’ve only had to replace the Diaphragm on the Carburetor Once plus normal maintenance( New Spark Plug every year. I’ve owned the STILH KM-55R for over 6 years. The Fuel Lines Fail because of Ethanol added to gasoline. I got tired of buying a low quality Weed Eater every year. Your STILH weed eater and any attachments will last for many years. If you faithfully Lube your STILH Weed Eaters Shafts and Line Gear Head every 25 hours,as recommended by STILH. This Lube is made by STILH and does what it is supposed to do. STILH KM- 55R weed eater shaft and line gear head lube
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