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go google and type in--- parts for ryobi 4 " angle grinder model eag 95
I recently spent may hours searching for parts for ryobi angle grinder 4" that is close to 45 years old and saw plenty of sites for ryobi and others that carried listings for many ryobi grinders
I suspect that you will be lucky as you have a model where as I didn't have that luxury
Some units have a button you push to lock the shaft. Then you turn the lock nut with the spanner. If yours will not lock the shaft wrap a rag around the blade so you can hold it tight and not hurt your hand and turn the lock nut. It also may have a left hand thread so you could be tightening a tight nut.
Handheld grinder or bench grinder? I'll assume you're asking about a handheld grinder.
Engage the arbor lock. You may need to rotate the wheel until you find the spot where the arbor lock locks the wheel. Use a wrench or a gloved hand to unscrew the wheel (I use my bare hand). Screw the replacement wheel on and disengage the arbor lock. The new wheel doesn't need to be very tight, it'll tighten itself as you work.
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 top of the head there is a button to press to lock the blade arbor. Press it down and turn the blade by hand until it locks in place. Then you need either a spanner wrench or nut wrench depending on which arbor nut you have. Grinders usually come with whichever wrench they need. Most grinders have an arbor nut with two or four holes and require a spanner wrench with two studs that fit into two of the holes to remove the arbor nut. Some have an arbor nut with a hex fitting, like a regular nut & bot setup, that the arbor wrench fits on. If you don't have the proper wrench sometimes you can get the arbor nut off with a pair of vice grips or pliers. You will want to turn the nut in the same direction as the blade spins when the grinder is on to remove it. When you put the new blade on, get the arbor nut hand tight, it is self tightening and will get tighter as you use the grinder.
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 .
Probably not, Remember the nut is a reverse thread. Your best bet it to try some penetrating fluid or try tapping the nut with a screwdriver, hopefully the vibration will help loosen it. Another trick that sometimes works if the machine has a diamond blade or an abrasive wheel with some life left on it is to put on a pair of heavy duty work gloves. Lock the arbor and try to grab the wheel tight and try to spin the wheel loose with your hand. Don't forget to unplug the machine before attempting to remove the wheel.
Place the grinder on a steady work surface and use a punch. So that you do not distort the nut find a punch that fits nicely into one of the holes. Hold the punch with vice grip and rap on the side of the punch close to the nut. One or two quick hits is all that you need. If the blade turns as you hit and the nut does not free, Either have a friend hold the lock button or lock the blade with two pieces of wood and vice grip (wood on each side of the blade and clamp on vice grip, then let turn till it hits one side of the guard. Good luck
i have trouble breaking makita parts loose. you will probably have to hit it. tap the bottom with a hammer to break rust or whatever loose. don't damage the shaft or nut. you may have to have someone help hold it while you put some muscle on it. good luck