BM-7
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14
3.6. Replacing the brushes
Check
the
condition
of
the
carbon
brushes
every
100
operation
hours.
To
do this, unplug
the machine from the power source, and unscrew the cover
1
(Fig. 8). Next, loosen
the screw
2
, pry off the spring holding the brush (
3
), and remove the brush (
4
). If the
length of the brush is less than 5
mm (0.2’’), replace both brushes with new ones.
To install brushes, proceed in reverse order. Make sure to place the terminal of the
brush wire
5
between the washer
6
and the terminal of the motor wire
7
. After the
replacement, run the motor without load for 20 minutes.
Fig. 8.
Replacing the brushes
1
2
3
4
7
6
5