Checking Brush Wear
1.
Check
to
see if the brush has worn to more than 2/3 below the standard dimensions.
2.
If wear exceeds the allowable limit, replace.
Reference value
Allowable limit
Longer than 12.7 mm
Model
M-30
M-40
M-50
Checking Brush Spring Tension
Length
19
mm
0.7480 in.
19
mm
0.7480 in.
I
I
Width
12
mm
0.4724 in.
25 mm
09843 in.
I I
1
: :::1 I I I J
'-..............
::
..........
.................
l
J,,'
Thickness
7mm
0.2756 in.
8mm
0.3150
in.
1.
Measure the tension with a new brush
in
place.
2.
Replace if the tension is under the reference value.
Model
M-30
M-40
M-50
Reference value
Spring
tension Commutator diameter
11.8
N.
32.7 mm
1.200 g
1,2874 in.
2.64lb
17.5
to 23.7
N.
1,785
to
2,415
g
30.0
mm
3.94
to
5.53
Ib
..
..
.....
' .
.....
~
17
Ie) Brush '
........
1.1811
in.
la) Spring hanger
Ib)
Attach
the
brush spring
in
this
method.
144
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