Fig. Q.8. Fitting Commutator End Bracket to Yoke

Fig. Q.7. Drive End Bracket with Circlip Retained Bearing

Fig. Q.9. Cross Section view of CA 45 Type Starter Motor - TM-55-1930-209-14P-9-4_757

TM-55-1930-209-14P-9-4 Water Purification Barges (NSN 1930-01-234-2165) Electric Power System Manual
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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).

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