Makita HR3851 instruction manual Replacing carbon brushes, Lubrication

001146

2

1

3

1.Commutator

2.Insulating tip

3.Carbon brush

003225

1

2

1.Hex wrench

2.Rear cover

003231

1

2

1.Screwdriver

2.Brush holder cap

Replacing carbon brushes

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 carbon 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.

Use a hex wrench to remove the rear cover.

Use a screwdriver to remove the brush holder caps. Take out the worn carbon brushes, insert the new ones and secure the brush holder caps.

003236

1

2

1.Lock nut wrench

2.Crank cap

12

Lubrication

This tool requires no hourly or daily lubrication because it has a grease-packed lubrication system. It should be relubri- cated after every 6 months of operation. Send the complete tool to Makita Authorized or Factory Service Center for this lubrication service. However, if circumstances require that you should lubricate it by yourself, proceed as follows.

Run the tool for several minutes to warm it up. Switch off and unplug the tool.

Remove the crank cap using a Makita lock nut wrench 35 (optional accessory). Rest the tool on the table with the bit end pointing upwards. This will allow the old grease to collect inside the crank housing.