The Norden Bomb Sight manual

D. Torque Motor (Cont'd) Fig. 16

bearing and tap into place. b. Place armature shaft in lower bear- ing and tap commutator end bearing bracket into place. c. Replace and tighten screws, holding bracket to base. (1) Check motor for freedom of move- ment. (2) If armature does not turn free- ly, loosen screws and check al- ignment of bracket. d. Replace intermediate gear and taper pin. 2. Replace field coils and shoes. 3. Reinstall clapper magnets. 4. Replace clapper magnet armatures and hinge pins. 5. To reassemble upper plate. a. Insert bearing in clutch gear and replace bearing clamp. b. Place clutch disc on shaft. c. Place disc on smooth end of shaft. d. Check to see that bronze and steel clutch gears are properly meshed. e. Tighten clutch shaft nut. CAUTION: Do not tighten clutch shaft nut too tightly for the collar of the clutch gear shaft will be shear- ed. f. Replace ring gear drive gear shaft in bearing, being certain that bear- ing is properly seated. 6. Replace upper plate. a. The lower bearing of the ring gear drive gear is self aligning. Be sure that the bearing is properly aligned before tightening the screws and dowel bolts holding upper plate to frame. Rotate gears to check for freedom of movement. Gears should move freely; if not check work. 7. Replace fiber terminal block. 8. Replace carbon brushes. (Brush plugs should extend 1/4" from brush holder.) 9. Connect all wires to the proper termin- als. Clearances to be checked after reassem- bly. a. Clearance between clutch disc and cork insert .003 to .005 of an inch.