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cordless drills have a switch that allows for more torque at lower rpms si in effect it is a 2 speed drill coupled with a variable speed switch that alters the rpms
If the drill is running I would be looking at a speed control problem at this point I would be looking at the torque control switch
Generally, When your have the 18V milwaukee drill, you had better to use the same voltage battery charger to charge the battery. it will be more safe. John. http://www.anybatteries.com.au/battery-model.php/Power-Tools-Battery_milwaukee.html
Yes this does have brushes, they are mounted on plastic plate that has to be soldered onto the switch. That noise might be the vanes that have broken off the main rotor. If you open it up you will be able to see. Yes they can be repaired but check with the milwaukee agent for cost. Some times it is more cost effective to buy a body only. Brush card is cheap about nine pound inc vat.
The only reason a battery powered device slows down is that it's not getting the appropriate voltage from the battery. Your m18 has a lithium-ion battery that when topped off, and for what should be a good long work-period, deliver 18vdc to the motor. Unfortunately, some of the earlier m18 batteries have had some issues and are not fully charging. Some of this is due to improper charging, over heating, storage problems and physical damage.
Milwaukee utilizes a "smart battery" Digital Management System to monitor the "draw" on the battery to keep the user from frying the motor or overtaxing the battery. How hard to you use the tools...perhaps you should trade the stock compact versions for the XC (extra capacity) versions.
You don't say how long you've had these tools, but if you'll go back to the retailer you bought them from, you may be able to get replacement batteries there. Otherwise, check out the Milwaukee website. I think they came out with M18 XC "RED LITHIUM". I think this might be a replacement.
Nonetheless, Milwaukee offers a 2 year warranty on their batteries, so contact your retailer or Milwaukee directly.
Depending on age of tool older models did not have replaceable brushes. Change motor. Newer models are replaceable , go to a service center and get a brush kit for this model. Or online. Open tool with # 8 torx. Do not separate motor and gear case ,chuck remove as one unit. Brushes are solder in .De solder used brushes . Replace one side at a time. These kits come with new coil tension springs .
there are no replacement brushes for this motor, it comes as a component part and runs around 48.00 for the complete motor. Give me the model number and I will get a motor number for you. I repair these everyday and replacing it is easy just keep in mind the wiring on the switch, it is polarity sensitive.
I would need the exact model number and serial number to help but the brush number is 22-18-0710 and there could be a couple different switches. Either give the ser number (the alpha code) or you can go direct to Milwaukeeelectrictool.com and type in the model number 6140 on the page for the breakdown. it might be easier to let me do it. I worked there for 17 years and if you can't get the alpha code look at the switch and I would need a good description of it
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