IBM 3274 51C Maintenance Information page 292

"
e
e
Clamp
Clamp Screw Timing Pin
Gap
Stepper Motor
Pulley
G
inspect drive band for damage.
or-----~==============~-----J
~
__
~------
__
------~------
__ o
G
Drive band should track
para"el to pulley edge.
Figure F-33. Stepper Motor Pulley and Clamp Removal and Replacement
Appendix F. IBM 51TD Diskette Drive Maintenance F-49