PLDC04348
REVISION 00
November 09, 2020
TECHNICAL OFFICE
November 30, 2020
20
of
58
Checks
14
Measure the carbon brushes to establish the extent of wear, and compare the values with those illustrated below.
15
The length of the carbon brush must be no less than ≤ 4.7 mm (0.19 inches).
16
In the event that the measurement, even of one carbon brush only, is close to the value indicated as necessita-
ting replacement, proceed to detach the brushes from the power leads.
17
If the carbon brushes appear still to be in good condition, check each one for the state of wear and the integrity of
the sliding contact surface, which must present no indications of abnormal wear, or of scorching.
18
Blow the inside of the motor clean with a jet of compressed air, paying particular attention to the area around the
carbon brushes and the rotor where the carbon brushes slide.
19
Check wear in the places where the carbon brushes slide before replacement. A damaged rotor would cause
premature wear of the new carbon brushes.
The carbon brushes must always be replaced as a pair, at one and the same time.
G
Always check that the new carbon brushes are the same shape and size as those being
replaced (naturally apart from the length) and that they slide freely in their seats.
G
9.80
±
0.1
mm
≥ 0.19 in
0,385 ± 0,004 in
≥
4.
7
m
m
8.70 ± 0.1 mm
0.34 ± 0.004 in
7.70 ± 0.1 mm
0.30 ± 0.004 in
14
14
15
Summary of Contents for NOBLES S6
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