Can you believe there are close to 25 to 30 grinder parts that make an angle die grinder? Let me try to list as much now. O ring, retaining ring, spiral bevel gear, ball bearing, spindle, wheel cover, pan head screw, tapping screw, inner flange, lock nut, woodruff key, grip holder, cord guard, strain relief, standing lock nut, rubber pad, compression spring, baffle plate, fan, insulating washer. The good thing is that most of these grinder parts are replaceable..There is a varied choice available for these grinders from different manufactures which make it more competent and interesting in the market. Most of the critical internal parts of the machine will suit another unit from the same maker..When your unit fails, do not throw them away completely. You can probably open the case and preserve a few spare parts which are in good condition so that they can be re used when you find some minor repairs with another apparatus..
When you want to debug an angle die grinder that has failed amidst working, it may contain lot of dust inside because of some particles you have worked with or because of wear and tear. You can try your luck in repairing them..For safety issues, remove the power cord. Keep your face not too close to the device. Make sure you cover your eyes with goggles and your nose so that you don't inhale the dust..
Cordless Angle Grinder
There could be some minor problem with the grinder parts mostly the brushes. There will be screws that are holding your angle die grinder case. Kindly unscrew and remove the housing. Identify the brush holders. They are usually square shaped, made of brass. Remove them from the unit using your tool kit like a flat screw driver. The brushes will be made of carbon usually a pair of them located on either side. Check both of them at once..When the brushes are dirty, you can clean them with something like a pencil eraser. When there is more dust, you can use some air to be blown off to remove the dust. But if they are worn off or off shape, you should replace them..
To finish the work you started with, until you get a new one, you can make some alterations and adjust for the time being. Take a piece of sand paper and rub these brushes against them until their surface become smooth. After they get smoother, you can replace them back from where you removed. Now, check your grinder parts by powering your unit.
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Bare-Tool Hitachi G18DLP4 18-Volt Lithium-Ion 4-1/2-Inch Angle Grinder (Tool Only, No Battery) Feature
- Tool body compatible with all Hitachi Lithium Ion, NiCd and NiMH 18V batteries
- High torque motor with no-load speed of 9,100 RPM to power through tough cutting and grinding applications
- Slim body design with soft touch grip for improved control and comfort
- Slide switch with quick off feature to immediately shut tool down for added safety
- Removable side handle improves comfort and control
Bare-Tool Hitachi G18DLP4 18-Volt Lithium-Ion 4-1/2-Inch Angle Grinder (Tool Only, No Battery) Overview
Not ompatible with 1.5Ah Lithium Ion Slide Style Batteries (BSL1815X)SAVE NOW on the special offers below!
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As one of the pioneers driving the cordless tool revolution, Makita changed the game with its breakthrough 18V LXT Lithium-Ion Cordless Series. Three years after its debut, Makita's LXT Series has grown from seven to over 35 tools, providing a wide range of cordless solutions for professional tradesmen. Makita also added 18V Compact Lithium-Ion for cordless power in a more compact size. 
About Makita
Every Makita Lithium-Ion tool is backed by Makita's 3-Year Warranty that covers repair due to defects in materials or workmanship up to three years from the date of original purchase. Makita Lithium-Ion batteries and chargers have a limited 1-year warranty. Please see makitatools.com for complete details. 
