ELECTRICAL EQUIPMENT—Q.10
Fig. Q.8.
Fitting Commutator End Bracket to Yoke.
3.
Ensure that the pressure and felt rings and the
retaining plate do not fall out.
4.
Check that the replacement bearing is clean and
push it fully home with a hand press.
5.
Replace the bearing retaining plate and after
replacing the circlip in position, compress the
whole assembly enough to allow the circlip to re-
locate itself.
(h)
To Re-Assemble
1.
Fit the shaft collar retaining cup and drive end
bracket to the armature shaft. The inner journal
of the bearing must he supported by a tube,
approximately 4 in (10(1 mm) long, 1/8 in (3 mm)
thick and internal diameter 5/8 in (16 mm). Do
not use the drive end bracket as a support for
the bearing whilst fitting an armature.
2.
Fit the yoke to the drive end bracket.
3.
Push thc brushes up into the brush boxes and
secure them in that position by positioning each
brush spring at the side of its brush.
4.
Fit the commutator end bracket on the armature
shaft until the brush boxes are partly over the
commutator. Place a thin screwdriver on top of
each brush in turn and press the brush down on
the commutator. The brush springs should then
position themselves on top of the brushes.
5.
Fit the commutator end bracket to the yoke so
that the projection on the bracket locates in the
yoke.
6.
Refit the two through bolts. After assembly
lubricate the commutator end bearing.
STARTER MOTOR
Model - CA45
GENERAL DESCRIPTION
Designed for flange mounting, the C.A.45 starter motor
has a uniform cylindrical shape with no surface
protrusions. This is because the solenoid and main
switch assemblies are housed within the drive end-
shield, around (i.e., co-axially with) the armature shaft.
The essential feature of the co-axial starter is that, the
pinion alone moves axially to engage the engine
flywheel. There is no longitudinal movement of the
whole armature assembly, as in the axial types.
Smooth engagement of the pinion with the engine
flywheel is constantly ensured by using two-stage
operation of the solenoid and switch mechanisms. Thus
the risk of damage to both pinion and flywheel, through
faulty meshing. is practically eliminated.
In construction, the starter consists of three main
sections. into which it can he easily dismantled.
1.
The solenoid switch-gear and pinion assembly
housed in the drive end-shield.
2.
The armature. shaft and commutator assembly.
3.
The yoke, pole-piece and field-coil assembly.
Ready access is possible therefore, to those parts
most likely to require adjustment, such as the switchgear
and commutator assemblies.
OPERATING MECHANISM
The starter is designed for working off a 12 volt supply,
with 17 amps solenoid current.
The starter operating mechanism consists of the
following main parts, viz.:
The solenoid (10) and resistor (9) (Fig. Q.9).
