Inspection: Brush Spring Pressure; Inspection: Brush; Brush Length; Inspection: Yoke - Mitsubishi 6M60-TL Service Manual

#930 STARTER
54-22

Inspection: Brush spring pressure

• Using new brushes, measure the load required to separate each
brush spring from its brush.
• If either measurement is lower than the specified limit, replace
the brush springs.
Inspection: Brush (–)

(1) Brush length

• If either brush (–) is shorter than the limit, it must be replaced.
CAUTION
• The brush (–) and its brush holder should be replaced as a
set.
(2) Contact surface of armature's commutator and brush
• If the commutator contact surface of either brush is rough or un-
evenly worn, rectify it with emery paper (#300 to 500).
Inspection: Brush holder
• Thoroughly clean the (+) brush holder and the (–) holder plate,
then, check that continuity does not exist between them.
• If continuity exists, there is a short circuit and the brush holder
must be replaced.

Inspection: Yoke

(1) Test for coil open circuit
• Check that continuity exists between the cable and the (+)
brush.
• If there is no continuity, there is an open circuit and the yoke or
(+) brush must be replaced.
(2) Test for coil grounding
• Check that continuity does not exist between the yoke and the
(+) brush.
• If continuity exists, the coil is grounded. Inspect the insulation,
and replace the yoke and the (+) brush if the insulation cannot
be rectified.
CAUTION
• The coil may be grounded to the yoke due to the accumula-
tion of worn-off metal particles from the brushes and/or ar-
mature.