Grinder only works when screws are loose on the head
My grinder stoped working. Tried to get inside to clean it up. Found that when I loosen the top screws and seperate the head from the body a little it works fine, but when I tighten the screws back it stops working. I cant seem to get inside to see what the problem is.
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Re: grinder only works when screws are loose on the head
I would suggest going to Makitatools.com and typing in your model number to look at a schematic. It could be numerous things that are wrong. I would think a bearing is going bad, but take a look and let me know and I will see what I can do.
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you need to depress it fully to disengage the lock. If the head does not depress enough there is a screw that you would need to loosen on the left hand side to allow for the head to travel lower. Make sure there is nothing under the blade to affect movement before trying bolt.
After taking the bearig box off the head, remove the retaining ring and wave washer on top of the gear. Some spindles can be tapped out of the gear with a hammer but be extremely careful not to mushroom the spindle head. It's best to take it off with a hydraulic press. There is a woodruff key in there so be careful not to loose that when you press the spindle out of the gear. The new gear should be pressed back on also.
You have to pull the brushes back there should be screw caps on the back (cord end) remove them and take out the brushes if the gears are ok and there is grease in ther then it will be the brushes or the bushing on the back
There is a nut that you release from the middle of the grinder wheel, (grinder blade) This nut is flat and has four holes in it.
You will see you are providing a spanner wrench to remove this nut. The wrenches' actual name is Lock Nut Wrench. It has a U shaped end with two pins sticking out. On on each side of the U shape.
The pins are inserted into the holes in the flat lock nut, located in the middle of the grinding wheel. The wrench is laid flat against the grinding wheel, with the two pins of the wrench going into any two holes of the nut.
At the top of the Makita grinder you will see a Black button. The button is pushed down to keep the grinding wheel from spinning. Holds the grinding wheel in place, as you turn the lock nut loose. When you release the button, a spring inside pushes the button back up out of the way.
As you view the Makita grinder, Release Button towards the Back, grinding wheel towards you, the nut is turned to the LEFT, to loosen. It is a Left threaded nut.
The grinding wheel spins to the Right. Using a left threaded nut insures that the nut will stay tight, due to the direction the grinding wheel spins.
all grinders have wheel lock button located usuall on the front facing you... its black... press it and try turning the wheel... when you felt it is locked try turning the wheel.. manually... the bolt should loosen... dont 4get to unplug the unit first....
If it is a late design, there should be a button, on the 'head' of the grinder, which stops the disk from turning. Then you should have a spanner key, that fits in the nut that holds the disk on, turn in the 'Left hand down' direction to remove. However, if it does not have the said mechanism, you could always use 'Shock' treatment to remove the disk. Take a hammer. An old flat blade screw driver. Now wedge the disk so it doesn't turn, and place the tip of the screw driver in one of the holes, of the nut that holds the disk in place. Now strike, until it comes loose. This method works every time, but there is a small amount of damage incurred. ps. Don't hit your hand:) It hurts. Good luck with that.