How can I get the case off a makita impact driver to repace the switch

SOURCE: makita 12v impact driver- no reverse

I would suggest that you go to Makitatools.com and type in your model number and look at the breakdown for complete disassembly procedures. The only problem it could be it the tab on the switch or the shift lever is broken I would have to think it is the switch. Let me know if I can help more.

SOURCE: Makita 14.4V Cordless Impact Driver only works at high speed

Most cordless drill / drivers like this have electronic switchs which unfortunately would have to be fixed by a repair agent. Depending on it's age - make sure that you tell the agent that it never really worked properly, warrentys only cover parts that were faulty from manufacture and not wear and tear, so it may get fixed for free depending on the repair centre

SOURCE: disassemble , houseing makita Model 6935FD Cordless

I would recommend going to Makitatools.com and typing in your model number for a schematic. Basically all you have to do is remove the 4 screws on the front holding the gearcase and then remove all the other screws holding the handle halves together. Let me know if I can help

SOURCE: Disassemble a Makita 6980FDWDE Impact driver

Sometimes fasteners are hidden under labels.

SOURCE: how to pull apart makita 6980 impact wrench

the battery is removed. remove all screws around the outside of the drill/driver. the side comes off. the motor is a johnson motor connected to the planetary drive and hammer/anvil assembly. the motor drive extends inside the anvil via one gear off the motor. the hammer and anvil come out as one piece. if you depress the center of theanvil with an arbor press, two ball bearings come out and the escapment comes out with the spring. now you can clean the inside of the hammer and gears of the hammer drive.