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The grinder should have come with a special wrench that fits the "nut" that holds the wheel on. There should also be a button to push to lock the shaft. With the grinder unplugged gently push the button in and turn the wheel till the shaft locks then put the whrech on the nut and spin it off.
If there isn't an arbor nut holding the blade/disc on the grinder you have a disc with the threaded center built into it. While holding the arbor lock button down you have to turn the disc by hand until it breaks free and spins off. It may be on vary tight as it is a self-tightening thread so the disc won't come off while you use it.
1 Check the grinder before you
begin. The newer discs on rotary grinders have patented buttons that
allow you to remove the disc without any tools. You may have one like
that. In models like this, there's usually a spot to depress and then
remove the disc.
2 Turn off the grinder before you
attempt to remove and change the disc on your rotary grinder. If it's
battery powered, put the grinder in lock position so you can't
accidentally turn it on. If it's electric, unplug the grinder from the
3 Look for a nut in the center of
the disc. This is a give away that you need to use your special wrench.
Sometimes the grinder comes with a tool necessary to loosen and remove
the nut. Other times you need to use a wrench.
4 Lock the wheel into place before
you begin. You can find a button or switch at the side or back that
allows you to do that. When you lock the wheel in place, the disc
remains still as you loosen the nut in the center.
5 Remove the nut in the center
with either the tool provided with the grinder or a shop tool and lift
the disc off your rotary grinder.
6Lift the disc off the rotary
grinder. If you have different discs, remember to check for the best
fit. Put the nut back on a different way for different discs. Check for a
rim and indentation on one side of the nut and a flat side on the
other. A visual inspection of the disc for the rotary grinder gives you
information about the side to use.
Here is a diagram of your grinder and the tool you are looking for is number 50...
There is a button at the front of the grinder usually black or red, depress it lightly and rotate the wheel (unplug grinder please) wait until you feel it fall into spot, depress tightly and hold then turn wheel and unscrew to replace pad. Reverse to reassemble.Good Luck....
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 .
Tools required: Large blade and medium Phillips head screwdrivers
In order to adjust the grind, follow these steps (Refer to
1. Remove all coffee from the hopper.
2. Set selector knob to the finest setting (Espresso or Turkish)
depending on the model.
3. Loosen both knob retainer screws in selector knob one turn only.
4. While pressing the bag switch, located behind the spout, press the
START button so that the grinder will run during adjustment.
810 model - Press the ON or START button so that the grinder will
run during adjustment.
5. With the grinder still running, turn the adjusting screw in the center
of the selector knob slowly to the right until a slight clicking noise is
heard. Immediately turn the adjusting screw to the left one grind setting. This is the finest grind obtainable.
6. Tighten both of the knob retainer screws. Once the ESPRESSO grind has been set (Turkish for Model 835,
875, 890), the other grind settings will automatically set correctly.
7. Press the STOP or OFF button.
IMPORTANT: Always be sure the grinding burrs are not touching while the machine is running on the
ESPRESSO/TURKISH setting. Otherwise serious damage to the motor may result.
HI When making adjustments to any grinder it should be grinding at the time. Rotate the adjustment setting to a larger number, say 10 an try again. Then if it starts, turn it down to the number you want.
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.
On the top of the grinder there should be a button. hold that in while turning the disk (please have the grinder unplugged while you do this). The button wil drop further in when it finds the notch in the gear. This will lock the spindle, allowing you to remove the retaining nut.