The sprocket will be the part of a string saw that connects the string to the engine crankshaft, and when it overlooks, the saw loses electricity and also won’t cut effectively. McCulloch chain saws can have a rim or wax sprocket, and based on the design, replacing it might involve removal of this clutch. In some cases, a shiny or worn clutch could possibly be the reason why the sprocket is malfunctioning in the first location.
McCulloch chain saws are in existence since the mid-20th century, and the company has introduced several versions. They equip some versions with spur sprockets — additionally called star sprockets. This type of sprocket a part of the clutch drum, which is the outer part of the clutch mechanism which rotates only when the throttle is engaged. Other versions — especially electric ones — have rim sprockets, that can be mounted at the crankshaft independently of their clutch. Both types of sprockets wear out, and replacing one is dependent upon how it is mounted to the crankshaft. On McCulloch tools, you usually have to eliminate the clutch shoes to get to the sprocket.
The most important symptom of a terrible sprocket is inferior chain answer. You might find the string slowing down down or even stopping when you try to cut through something. This can happen because the sprocket fins no more catch on the string, but additionally, it may occur because the clutch is slipping. Removing the clutch cover, either by obeying the maintaining nuts with a socket wrench or unscrewing the plastic bows by hand based on the model — lets you scrutinize the sprocket for wear. If the fins are not visibly worn, then the clutch shoes might have to be replaced.
Locking the Crankshaft
So as to access the clutch drum along with the socket, then you need to remove the clutch shoes. This isn’t a difficult procedure, but it involves binding the piston to stop it from moving. If you do not do this, you can not turn the clutch to unscrew it without turning the crankshaft. To bind the piston, remove the spark plug, stuff most of a shoelace in the hole, leaving enough hanging out for simple removal, and also pull on the starting rope to wedge the piston from the shoelace. The crankshaft is currently locked, and you’ll be able to unscrew the clutch.
Replacing the Sprocket
The clutch has reverse threads, which means you have to turn it clockwise to unscrew it. Wedge a flat-head screwdriver in one of the spokes and tap on the screwdriver with a hammer to acquire the clutch started; it then easily unscrews. You’ll have the ability to slide off the drum after removing the clutch. If the saw has a spur sprocket, you will want to replace the entire drum, but if the saw comes with a rim sprocket, you can slide that off the wax and replace just that part. As you have the clutch shoes off, it’s a good idea to inspect them thoroughly for wear and replace them if needed.