IBM Selectric I/O Reference Manual page 10

FIGURE 7. Operational Mechanism
1. Escapement-com-follower roller
2. Print-shaft bearing
3. Escapement clevis
4. Spring-clutch arbor. Oil carriage return spring clutch
only when reassembly is necessary
5. Index pawl
6. Tab-torque-bar pivot
7. Power-tab bellcrank-I ink ends and pivots
8. Feed-roll bearings
9. Escapement -shaft bearing
10. Operational shaft bearing
11. Operational cam pivot (ratchet) (Use #23 when parts
are removed or replaced.)
FIGURE 8. Bottom View Showing Contact Location
1-8
Carrier-Return
Interlock Contact
FIGURE 9A. Right View Showing Contact Location
IBM #23
A. Operational-cam surfaces, rollers, and drive ratchets
B. Actuating arm and check-pawl contact surface
C. Torque-limiter spring clutch*
*Every 6 months / 1 Shift Operation
Every 3 months / 2 Shi ft Operation
Every 6 weeks / 3 Shift Operation
PRINTER CONTACT LOCATIONS
Figures 8 to 12 show the locations of the printer contacts.
FIGURE 9B. Right View Showing Contact Location