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Turner_NZ

Makita TD170DZW dropping bits

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i have a Makita TD170DZW  and it keeps dropping bits, bought it in 2017 and after 6 months it started happening to a point its almost unusable, i have opened up the chuck and it seems the ball bearings are too small or the anvil recesses for the ball bearings are machined slightly wrong not allowing the ball bearings to drop enough but i dont want to machine anything or i could make it worse.

 

anyone else had this issue ? i did see a used one on site i picked up and it was holding the bits ok but you could still pull the bit out without engaging the chuck ? gone back to my 11 year old original makita impact as its that frustrating.

 

any help would be amazing thanks 

     

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turns out inside the chuck there is a tiny magnet at the back to hold the bit in as you change bits etc and what happened was i remember one day i took a tex screw out in a tight area and the drill got jammed between a joist and the screw as it came out and the pressure smashed the magnet to bits inside the chuck, i wasn't aware for a long time and turns out if the magnet isnt there the bit can go past the point its supposed to and fall back out of the chuck, so i cut the end off an oil bit and shot penned it in there works a treat now. just make sure you cut it the right length mine was 5mm easy fix. 

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