Shop Talk

Replacing Makita 9564 Grinder Armature

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    Makita 9564 Grinder PartsMakita 9564 Replacement Armature


    The 9564 Makita grinder is a pretty strong running grinder. No question it’ll get the job done for you. With that being said, if you use it pretty regular its only a matter of time before it’ll break down. There are several common breakdowns for all grinders, and that includes your Makita. This is instructions on how to replace the armature of your 9564 grinder if it goes out on you.How do you know if its your armature

    • Difficult start-ups
    • Shut-offs during use
    • Visible discoloration, damage, warping or chipping


    Burned Armature

    This is what a bad armature could look like:

    Damaged Commutator: This is a very common armature malfunction. This is also one of the most deceptive symptoms. Believe it or not just because the commutator my look bad doesn’t necessarily mean it is malfunctioning. If this is the only part that looks bad on your armature, I would strongly suggest you try a new set of brushes before you change out your armature.

    Burned Coil Band Burned Out Coil Winding: Notice how only one band of the coil is burned up. If you see this, you should replace your armature.
    Burned up armature Worn Out or Burned up Coil: Notice how the armature is much darker than usual. This is a pretty strong cue that it is burned up.



    Replacing Armature Instructions

    Makita 515226-6 armature Get the right armatureOrder online:

    Makita 515231-3


    Remove back of 9564 grinder Unscrew the screws located in the back of your grinder right next to the power cord.
    Take off rear cover Remove the back cover from the motor housing.
    Remove Brushes Take Out Brushes: The brushes are located at the back end of the blue motor housing. (There will be two, one on either side) Simply pull off the brush leads and slide the brushes up and out of the brush holder.Check out the brushes:

    Order online: 9564 Brushes

    gear housing Take out the four screws holding togeather the gear housing to the gear housing cover.
    gear housing motor housing Separate the housing from the cover from each other.
    gear housing cover Pry Off Motor Housing Cover: There will be a small slot on one side of the motor housing, with a screwdriver separate the gear housing cover from the motor housing.
    take apart gear housing base from motor housing Take Apart: Pull the gear housing cover from the motor housing.
    Makita Armature Compare Armature: At this point you will be able to fully compare your old armature with your new one.  The old armature will probably be pitted and worn down. You will also notice that the plastic insulation washer almost gone. Refer to the “bad armature” symptoms above for more information.
    magnet sleeve Remove Magnet Sleeve: With your stop spring removed simply pull off the magnet sleeve and the washer directly under it.
    take off stop spring Stop Spring: Turn your armature over and remove the stop spring that is holding your magnet sleeve in place. A dentists pick works great for this. Be sure to place stop spring in a special location so that you don’t lose it.
    secure armature Secure your armature: It will be much easier if you can secure your armature with something like a bench vice.   In this image you will see we have brass protection plates in the jaws of the vice to protect the armature. You could also use wood strips between the vice jaws and your armature.
    hex nut and washer Unscrew hex nut and remove the washer
    armature from lock spring removal Remove Gear from Armature: You will need to pry them loose with a screwdriver. When the gear and stop spring have been pried loose, you will be able to easily separate them from your armature assembly.
    take off armature lock spring Unclip the lock spring that is holding in the bearing.
    prepare hex nut Separating Armature From Gear Plate: In order to remove the armature from the gear housing plate you will need to lightly tap at the end of the armature with a plastic deadblow hammer. Protect your threads by replacing the hex nut.
    take out armature Tap Out Armature: Adjust your vice jaws so that you can loosely place your armature within the vice with the back of the gear housing plate resting on top of the jaws. Once this is done you will be able to lightly tap at the armature with a plastic deadblow hammer.
    turn over gear cover Now flip your gear housing cover over and place back on top of the vice jaws.
    insert new armature  Now insert your new 9564 Grinder Armature
    armature bearing Seat Bearing: Making sure your bearing is in place, tighten up your vice jaws to allow just enough room for the armature threads to loosely fit within the jaws and with the bearing sitting on top of the jaws.
     Place armature Place your armature on top of the vice, lightly tap it into place.
    replace armature retaining ring Replace Retaining Ring: Now that the armature bearing has been seated, replace the retaining ring.
    replace Armature stop spring Slip on the stop spring and the spiral bevel gear
    place armature gear over vice Place over cracked open vice jaws
    Tap home armature Tap Home: With the armature resting on the vice jaws, lightly tap home the stop spring and bevel gear.
    Replace Washer Hex nut for Armature Just replace the washer and hex nut.
    Labyrinth rubber ring Rubber Ring: If the Labyrinth rubber ring wasn’t attached to the exposed bearing when you removed your old armature, it will be inside your grinder motor housing. You will be able to remove it with something like a dentists pick. It will be located within the motor housing in the spot illustrated in the diagram.
    replace Laberynth rubber ring Carefully place the rubber ring over the exposed armature bearing.
    insert baffle plate Insert Baffle Plate: Align the baffle plate guide posts with the proper guide slots within your grinder motor housing and insert the baffle plate.
    replace armature housing Replace your Armature: Insert your new armature within your motor housing. If its resisting your light taps, take out your armature and make sure the rubber ring is in proper position. Try again, if it’s still not slipping into place you may have a distorted motor housing from overheating.If Needed:
    Makita 9564 Motor Housing
    Now simply assemble the rest of your grinder in the reverse order that you disassembled it. Thats it. You should be running in perfect order.