ash Posted January 28, 2016 Report Share Posted January 28, 2016 Hi, First post. I salvaged two drills that contractors discarded in the waste pile of a job hired for (must have been loads of profit or knackered drills . 1st drill corded Makita HR2470. Did not work so I opened it up and it appeared serviceable and I saw the brushes were floating. I reseated the brushes and the drill now spins up. Not sure what to test now but it maybe useful as maybe a mixer. 2nd drill is a Matika DHR242. Rotary hammer drill. This one looks more difficult to fix. Firstly it's battery powered but I may have a bench supply but not sure how much current it will want to test it. I opened up the drill and with the brushless motor there wasn't much to service - some electronic gubbins. I think the gearbox maybe kapput. Even following the guidance on rotating chuck and changing the 3 switch (rotation, hammer, etc) it will not go on rotation and jams. Are these brushless based tools serviceable or straight to the skip? 1 Quote Link to comment Share on other sites More sharing options...
JimboS1ice Posted January 28, 2016 Report Share Posted January 28, 2016 Welcome aboard, brushless has a lot of electronics which make it more difficult to repair, hard to say without some pictures.JimboSent from my iPhone using Tapatalk Quote Link to comment Share on other sites More sharing options...
John Glassey Posted January 28, 2016 Report Share Posted January 28, 2016 Hi, First post. I salvaged two drills that contractors discarded in the waste pile of a job hired for (must have been loads of profit or knackered drills .1st drill corded Makita HR2470. Did not work so I opened it up and it appeared serviceable and I saw the brushes were floating. I reseated the brushes and the drill now spins up. Not sure what to test now but it maybe useful as maybe a mixer.2nd drill is a Matika DHR242. Rotary hammer drill. This one looks more difficult to fix. Firstly it's battery powered but I may have a bench supply but not sure how much current it will want to test it. I opened up the drill and with the brushless motor there wasn't much to service - some electronic gubbins.I think the gearbox maybe kapput. Even following the guidance on rotating chuck and changing the 3 switch (rotation, hammer, etc) it will not go on rotation and jams.Are these brushless based tools serviceable or straight to the skip?Hi new guy! Your right in your approach to these drills. More then likely both of them are in need of brushes. I have owned Makita my whole life and I can truthfully say the only thing I ever had go south on them was the brushes. They are simple to get and simple to replace, and are fairly cheap. Now with that being said, the hammer drill may have other issues if it was not maintained. Most contractors don't. They treat them as throw aways. With the hammer drill you can try cleaning it out and relubercating it along with new brushes. In both cases you will have very little money involved and just a little of your time. First thing you need to do is find the manuals for them. A good source of knowledge for you to start with. Check out the forum, there is a link to a site that has just about every manual out there. Good luck. Quote Link to comment Share on other sites More sharing options...
comp56 Posted January 28, 2016 Report Share Posted January 28, 2016 plus it might be in your best interest to find out how old there are the brushless model just might still be under warranty...not sure how Makita handles warranty and receipts but they very well might go by date of tool not sales date.btw welcome to the forum.... Quote Link to comment Share on other sites More sharing options...
KnarlyCarl Posted January 29, 2016 Report Share Posted January 29, 2016 Hey there, I'd be interested to know what you found out about the brushless rotary hammer for sure. Definitely see if you can get a parts list/diagram. They used to come with all my dad's power tools when I was growing up, but I dont think many still do.Also interesting slang, is that Australian? Sent from my SCH-I535 using Tapatalk Quote Link to comment Share on other sites More sharing options...
Andrius Posted January 30, 2016 Report Share Posted January 30, 2016 I attached spare parts view for both models HR2470 if brushes was flowing it can be not only that problem because contact with carbon brushes housing and is located in motor housing. Check wires in switch because some times for this model is problem with wire and switch contact. Also you can check gear housing if you not afraid You need to check parts 23; 25; 90; if they are worn out hammer will not hold power when drilling. And in motor housing you need to check field contact. To do that you need to remove field by unscrewing screws Number 67 and taking out field. BHR242 accepts 18V DC current. You can check if switch is working because with this model is not much problems. This model have big problem with parts 32; 56; if you need to change them (normally they broke apart) please look for changed part number because it`s new parts for this tim of gear from Makita. Old gears not working properly for long time. If you need spare parts code write me PM and I will send them to you in PDF 1 Quote Link to comment Share on other sites More sharing options...
KnarlyCarl Posted January 30, 2016 Report Share Posted January 30, 2016 Nice thanks for the diagramsSent from my SCH-I535 using Tapatalk Quote Link to comment Share on other sites More sharing options...
ash Posted February 3, 2016 Author Report Share Posted February 3, 2016 Cheers. I have managed to source what appear to be the service manuals (titled Technical Information). I used the 2470 at the weekend with a sds chuck convertor and a mixing paddle to mix up a batch of plaster. I had to keep switching the drill from reverse to forward to get it started again. Eventually drill gave up but one time it went full on so I'll open it up again at some point. Still though I'll look to the contacts and cables because maybe it's the movement causing the intermittent fault. Quote Link to comment Share on other sites More sharing options...
Andrius Posted February 3, 2016 Report Share Posted February 3, 2016 I can bet that you need to change brush holder unit. Replacement part number is 638500-6 price in eBay is about 11 USD. It`s easy to change and cheap to buy Quote Link to comment Share on other sites More sharing options...
ash Posted April 18, 2016 Author Report Share Posted April 18, 2016 I re-seated the 2470 brushes, and re-seated the power cord, and that seems to have resolved the intermittent working. We'll see if it holds. I'll check out the holder. I don't have a SDS bit yet so I'm using a chuck converter in rotary mode. Getting alot of chuck wobble but assume that's the cheapie converter. The guidance says not to use the converter in hammer which I imagine it would shatter the chuck throwing shrapnel everywhere! Just need to fix the cordless dhr242 1 Quote Link to comment Share on other sites More sharing options...
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