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Trying to get blade off Rotozip by Bosch. Can't get the nut off to switch blades. I have depressed the shaft lock button, but can't get the nut to budge. Is there a trick to it?
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'Sprag' the blade to stop it from rotating. Apply some WD40 or kerosene around the area and use an impact gun or impact driver to crack the nut. Check the thread and make sure you are actually turning the right way to loosen the nut. Some are a left hand thread! Cheers Bob
There's usually a button on the housing to lock the blade. Unplug the saw first. Put pressure on the button while you rotate the blade by hand. The button will bottom out in the shaft, locking the blade when you reach the correct spot. You can now place a wrench on the nut to remove the blade.
The button does not disengage the blade, it only locks the blade/motor from spinning so you can remove the locking nut. Lock the spindle/motor/ blade, from moving and then remove the locking nut or disk. Should be counter-clockwise.
On the silver part on top of the grinder is a button , press this button and hold it down. now turn the blade until it stops moving, this locks the blade, keep holding the button down and turn grinder over ,and turn the nut counter clockwise, and remove it , take old blade off ,put on new one .it should go over the shaft and at the bottom on a "fit" Make sure it is on the "fit". replace the nut and tighten. If you dont get the nut tight enough it will loosen while in use and the disc you are cutting/grinding with will wobble and may even come off causing possible injury .
The blade is held in place by a bolt. Some models have a locking mechanism for the shaft. some do not. Either depress the spindel lock or use a piece of wood or similar to stop the blade from rotating and using the correct wrench size for the bolt head, turn the bolt counter clockwise to loosen and remove the nut. Insert the new blade and reverse the process by hoding the blade in place and tightening the bolt head clockwise
Here's the scoop on the MM875: it has a plastic piece called a "blade insulator" (part # 241381-01) that "locks" the shaft to the blade, so that you can remove the nut by stopping or blocking the blade. If it has been damaged or stripped out, then stopping the blade won't do anything. However, the metal spacer directly under the nut IS still locked to the shaft (because of its shape), so you can use a pipe wrench or something to hold that in place and unscrew the nut. You might even be able to get someone in a home improvement store to do this for you. But you will still need to replace the insulator, which is only a few dollars.
should be a black button between the handle and the guard. Spin the blade until it depresses all the way down and you should be able to loosen the blade.
With the saw UNPLUGGED, check around the base of the motor shaft, there should be some kind of button that you can depress to lock the blade from turning. Then with the appropriate sized wrench, turn the blade locking bolt clockwise (it is a backward thread) to loosen it. Then simply remove the washers, etc carefully and replace them the same way they came off. If there is no locking button, you can use a scrap piece of wood on the saw table and push down on the blade to lock it in place.
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