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MAINTENANCE AND INSPECTION
Page 39 of the owners manual

The carbon brushes in the motor are expendable parts.
If the carbon brushes become excessively worn, motor trouble might occur.

Therefore, inspect the carbon brushes periodically and replace them when they have become worn to the wear limit line as shown in Fig. 45.
Also, keep the carbon brushes clean so that they will slide smoothly within the brush holders.

Remove the two securing screws and the motor rear cover from the motor. Carefully remove the brush cap on the side of the motor. Third, pull out the carbon brush and replace. The ears on the metal end of the assembly go in the same hole the carbon part fits into. Last, tighten the cap snugly, but do not overtighten. Repeat above procedure for the carbon brush located on the other side of the motor.

When replacing the carbon brushes, use only Hitachi carbon brushes having “463” of Code No. (see Fig. 45). If you use other carbon brushes, the electric brake will not operate.