DRESSTA TD-25M EXTRA, Service Manual, Page: 318 / 595

SECTION 8
ELECTRICAL
Page 42
TD-25M EXTRA DRESSTA
CRANKING MOTOR 42 MT
The pinion is moved into mesh with the ring gear by the action of the solenoid. The pinion remains
engaged until the solenoid circuit is interrupted. In case of a butt engagement the motor will not be
energized to prevent damage to the pinion and gear teeth.
Under normal operating conditions, no maintenance will be required between engine overhaul
periods. At time of engine overhaul, motors should be disassembled, inspected, cleaned, and
tested as described in succeeding paragraphs.
As shown in the cross-sectional view of Fig. 8.13, the nose housing is attached to the lever
housing by means of bolts located around the outside of the housing. To relocate the housing, it is
only necessary to remove the bolts, rotate the housing to the desired position, and reinstall the
bolts. In this type of assembly, the lever housing and the commutator end cap are attached to the
field frame independently by bolts entering threaded holes in the field frame.
23. OPERATING (Fig.’s 8.12 and 8.13)
Fig. 8.13. Cross - Sectional View of Cranking Motor
1. Removable End Cap for Inspection
2. Bronze Bearing
3. Oil Wick
4. Connector Strap
5. Gasket
6. Low - Friction Bushing
7. Seamless, One - Piece Solenoid Case
8. O-Ring
9. Oil Wick
10. Sealing Boot
11. Totally Enclosed Shift Mechanism 12. Two - Piece Housing
13. O-Ring
14. Oil Wick
15. Bronze Bearing
16. Heavy - Duty 7-Roll Drive
17. Bronze Bearing
18. Shaft Seal
19. O-Ring
20. One - Piece Brush
21. O-Ring
NOTE: The starting circuit was explained in WIRING DIAGRAM Paragraph. 3, Machine Electrical
System in this Section.