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This guide will show you how to replace the carbon brushes in a Makita HM1307CB jack hammer. The steps to remove each of the two brushes are the same.
Before you begin, make sure the jack hammer is completely powered down and unplugged.
As you perform this repair, take note of all the screws that have been sealed with threadlocker and be sure to clean them and reapply the same color threadlocker during reassembly.
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Remove the following screws:
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Two Phillips screws
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Four hex screws
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First, clean the residual threadlocker from each of the screws with some cleaner/degreaser and a stiff brush.
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Second, apply a couple drops of high-strength threadlocker to the screw sockets.
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Finally, apply one or two drops of the same high-strength threadlocker to the tip of each screw and reinstall them.
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Grab the handle and remove it from the jack hammer.
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Remove the two hex screws holding the controller cover in place.
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Remove the controller cover and the attached power supply cord from the jack hammer.
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Remove the six 5 mm hex screws holding the rear cover in place.
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Lift up the rear cover and remove it from the jack hammer.
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Slide the brushes' metal clips off of the golden contact rails.
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Use your finger or a pry tool to pull back the spring holding each brush in place and press it against the brush channel to prevent it from snapping back into place on the brush.
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Slide the brushes out of their channels to remove them from the brush holder.
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To reassemble your device, follow these instructions in reverse order, taking note of any reassembly tips.
To reassemble your device, follow these instructions in reverse order, taking note of any reassembly tips.
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