The crankshaft bearing in your hedge trimmer can be found between the bearing and crank case. These bearings are extremely durable and will usually only require replacement after a severe lack of maintenance. Replacing the crankshaft bearings is a somewhat difficult repair. However, if you decide to take on the repair, you will want to begin by draining all fuel from the tank, and removing the air filter and the air filter bracket. Next remove the throttle cable and fuel lines from the carburetor and remove the carburetor itself. Now you can remove the isolator block gasket and isolator block. Remove the spark plug wire and the plug itself, then remove the motor housing. Remove the insulator gasket, the starter, fuel tank, and air duct. Now you can separate the clutch shaft screw that secures it to the engine. Slightly tap the motor off with a rubber mallet. Next, insert...
The crankshaft bearing in your hedge trimmer can be found between the bearing and crank case. These bearings are extremely durable and will usually only require replacement after a severe lack of maintenance. Replacing the crankshaft bearings is a somewhat difficult repair. However, if you decide to take on the repair, you will want to begin by draining all fuel from the tank, and removing the air filter and the air filter bracket. Next remove the throttle cable and fuel lines from the carburetor and remove the carburetor itself. Now you can remove the isolator block gasket and isolator block. Remove the spark plug wire and the plug itself, then remove the motor housing. Remove the insulator gasket, the starter, fuel tank, and air duct. Now you can separate the clutch shaft screw that secures it to the engine. Slightly tap the motor off with a rubber mallet. Next, insert the starter rope into the cylinder through the spark plug hole to stop the piston from moving. Using a pair of channel locks, you can now remove the clutch. Disconnect the flywheel by pulling on it as you tap the center spindle with a rubber mallet. Next remove the starter pulley, muffler, and cylinder. Separate the cylinder from the crankcase and separate the 2 halves of the crank case from one another. To separate the crank case halves, you will need to push the crankshaft through the bearing. To do this, you can use a rubber mallet to tap the shaft. Now remove the crank shaft on the other side with the rubber mallet. You will have to remove the crankshaft bearing seals on both ends of the crankcase. To accomplish this, place the crankcase seal-side-down and insert a screwdriver through the center of the seal and tap it out with a rubber mallet on both sides. To remove the bearing, use a socket that fits on top of the bearing and tap it with a rubber mallet on both sides. Now you can install the new bearings and start reassembly. To do so, insert the new bearings and attach a socket big enough to make contact with the outer race of the bearing and tap with the mallet. Repeat for both sides and insert new bearing oil seals. You will want to rub a little oil on them first, then tap them into place using a socket. Install the larger side of the crankshaft into the case first (after lubricating with oil) and insert the longer end into the crankcase. You may have to tap it into place with a rubber mallet. Next, install a new gasket where the 2 crankshaft seals join and re-assemble. Insert screws to pull the housing back together and work all the way around to pull it down evenly. This will create a solid seal and not damage the gasket. Now you can re-install the cylinder onto the crank case and replace the gasket. First, make sure the old gasket has been cleaned off completely and be sure to lubricate the inside of the cylinder before you reinstall it. Make sure the ignition coil is on the same side the flywheel. Next, you can reinstall the starter pull and flywheel, making sure to align the flywheel with the markings. You can now reinstall the clutch and be sure to tighten it properly. Remove the starter rope from cylinder. Now you will have to reset the gap between the flywheel magnets and the ignition module. You can accomplish this by using an ignition coil gapping tool. You will want to slightly loosen both screws on the ignition coil and rotate the magnets on flywheel into the place of contact on ignition coil. Insert the gapping tool and allow the magnets to pull the coil tight against the flywheel. Then you can tighten the ignition coil and re-install the muffler and new muffler gasket. Re-install the engine assembly back onto clutch assembly and reconnect the ignition wires. Next, re-install the fuel tank, air duct, and starter. It may need to be rotated slightly to engage the pawls. Install the screws and tighten the back up. Install the insulator gasket and re-install the cover and tighten it properly. You can now re-install the sparkplug and wire, as well as the carburetor insulator and be sure to tighten the bolts. You can now reconnect all the fuel lines. Press the primer bulb to determine which port on your carburetor is the incoming line and which is the return line. Re-attach the fuel lines to the correct port, and reattach the throttle cable, being sure to tighten the cable nut down. You can now re-install the air filter bracket, the base, the carburetor, and the intake gasket, and tighten down properly. Finally, install the air filter and cover.
Read More