TOHATSU MD 30B2 Service Manual page 272

Cowl, Bracket and PTT Unit
20) Inspection of PTT Motor
1. Measure brush length.
Replace if it is less than specified value.
Brush Wear Limit a :
5.0 mm (0.1969 in.)
2. Check electrical conductivity of brush and circuit breaker.
Replace if not conductive.
· Do not disconnect PTT motor lead from
stator.
· Do not touch bi-metal b. Doing so affects
operation of circuit breaker.
3. Measure diameter of commutator.
Replace if the following specification is not met.
Lower Limit of Commutator Diameter c :
20.4 mm (0.8032 in.)
4. Check electrical conductivity of armature.
Replace if any of the following conditions is not met.
Armature Conductivity
Commutator
Commutator d -
Armature Core e
Commutator d -
Armature Shaft f
5. Check the base for crack and damage, and replace if
necessary.
6. Check bearing and oil seal for damage, and replace if
necessary.
When bearing or oil seal is removed,
replace it with new one.
7-42
CAUTION
Conductive
Not Conductive
Not Conductive
CAUTION
b
c
a
d
f
e
TLD D30/40/50B2 2013