SELVA MARINE Blue Whale 250 EFI, Service Manual

Page: 284 / 377

BRKT
Bracket unit
7-29
6P23H11
2. Measure the commutator diameter.
Replace the armature if below specifica-
tion.
3. Measure the commutator undercut
a
.
Replace the armature if below specifica-
tion.
4. Check the armature for continuity.
Replace if out of specifications.
5. Check the circuit breaker of brush holder
for continuity. Replace the PTT motor
base assembly if there is no continuity.
6. Measure the brush length. Replace if
below specification.
7. Check the motor base. Replace if
cracked or damaged.
8. Check the bearing and oil seal. Replace
if damaged or worn.
Assembling the PTT motor
1. Install the new oil seal
1
and bearing
2
into the motor base
3
as shown.
Motor commutator standard
diameter:
23.0 mm (0.91 in)
Wear limit: 22.0 mm (0.87 in)
Motor commutator standard
undercut
a
:
1.40 mm (0.055 in)
Wear limit: 0.90 mm (0.035 in)
Armature continuity
Commutator segments
b
Continuity
Segment – Armature core
c
No continuity
Segment – Armature shaft
d
No continuity
Motor brush standard length:
11.5 mm (0.45 in)
Wear limit
e
: 4.5 mm (0.18 in)