Makita HR4000C Instruction Manual page 10

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1. Commutator
2. Insulating tip
3. Carbon brush
1. Screwdriver
2. Brush holder cover
1
2
1. Screwdriver
2. Brush holder cap
1
1. Screws
10
Replacing carbon brushes
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When the resin insulating tip inside the carbon brush is exposed to contact the
commutator, it will automatically shut off the motor. When this occurs, both car-
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bon brushes should be replaced. Keep the carbon brushes clean and free to
slip in the holders. Both carbon brushes should be replaced at the same time.
Use only identical carbon brushes.
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Use a screwdriver to remove the brush holder cover.
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2
Use a screwdriver to remove the brush holder caps. Take out the worn carbon
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brushes, insert the new ones and secure the brush holder caps.
Reinstall the brush holder covers firmly.
Lubrication
This tool requires no hourly or daily lubrication because it has a grease-
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packed lubrication system. Lubricate the tool every time the carbon brushes
are replaced.
Run the tool for several minutes to warm it up. Switch off and unplug the tool.
Loosen the six screws and remove the handle. Note that the top screws are
different from other screws.