Makita Jack Hammer HM1307CB Brush Replacement

简介

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.

你所需要的

步骤 1 Remove six screws from the handle

Makita Jack Hammer HM1307CB Brush Replacement, Remove six screws from the handle: 步骤 1 中的图像 1，1

Remove the following screws:
Two Phillips screws
Four hex screws
These four hex screws are all held in place with threadlocker, and may take quite a bit of torque or even some heat to loosen.
During reassembly, clean the residual threadlocker from these screws, then reapply high-strength (red) threadlocker to each one before reinstalling.
If you aren't sure how to apply threadlocker, refer to the next step in this guide.

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步骤 2

Makita Jack Hammer HM1307CB Brush Replacement: 步骤 2 中的图像 3，3

To reapply threadlocker:
First, clean the residual threadlocker from each of the screws with some cleaner/degreaser and a stiff brush.
Second, apply a couple drops of high-strength threadlocker to the screw sockets.
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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步骤 3 Remove the handle

Makita Jack Hammer HM1307CB Brush Replacement, Remove the handle: 步骤 3 中的图像 1，2

Makita Jack Hammer HM1307CB Brush Replacement, Remove the handle: 步骤 3 中的图像 2，2

Grab the handle and remove it from the jack hammer.

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步骤 4 Remove two hex screws

Makita Jack Hammer HM1307CB Brush Replacement, Remove two hex screws: 步骤 4 中的图像 1，1

Remove the two hex screws holding the controller cover in place.
During reassembly, clean the residual threadlocker from these screws, then reapply high-strength (red) threadlocker to each one before reinstalling.

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步骤 5 Remove the controller cover

Makita Jack Hammer HM1307CB Brush Replacement, Remove the controller cover: 步骤 5 中的图像 1，2

Makita Jack Hammer HM1307CB Brush Replacement, Remove the controller cover: 步骤 5 中的图像 2，2

Remove the controller cover and the attached power supply cord from the jack hammer.

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步骤 6 Remove six hex screws

Makita Jack Hammer HM1307CB Brush Replacement, Remove six hex screws: 步骤 6 中的图像 1，1

Remove the six 5 mm hex screws holding the rear cover in place.
These six hex screws are all held in place with threadlocker, and may take quite a bit of torque or even some heat to loosen.
During reassembly, clean the residual threadlocker from these screws, then reapply high-strength (red) threadlocker to each one before reinstalling.

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步骤 7 Remove the rear cover

Makita Jack Hammer HM1307CB Brush Replacement, Remove the rear cover: 步骤 7 中的图像 1，2

Makita Jack Hammer HM1307CB Brush Replacement, Remove the rear cover: 步骤 7 中的图像 2，2

Lift up the rear cover and remove it from the jack hammer.

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步骤 8 Disconnect the brushes

Makita Jack Hammer HM1307CB Brush Replacement, Disconnect the brushes: 步骤 8 中的图像 1，3

Makita Jack Hammer HM1307CB Brush Replacement, Disconnect the brushes: 步骤 8 中的图像 2，3

Makita Jack Hammer HM1307CB Brush Replacement, Disconnect the brushes: 步骤 8 中的图像 3，3

Slide the brushes' metal clips off of the golden contact rails.

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步骤 9 Move the tension spring

Makita Jack Hammer HM1307CB Brush Replacement, Move the tension spring: 步骤 9 中的图像 1，3

Makita Jack Hammer HM1307CB Brush Replacement, Move the tension spring: 步骤 9 中的图像 2，3

Makita Jack Hammer HM1307CB Brush Replacement, Move the tension spring: 步骤 9 中的图像 3，3

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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