TM 9--2815--247--34 0084 00--6 STARTER DRIVE MECHANISM REPAIR -- CONTINUED 0084 00 Inspection -- Continued 4.   Measure outside diameter of bearing hubs (26) on spur gearshaft (7). Replace spur gearshaft if not within the following limits. 5.   Measure inside diameter (27) of ball bearings (20). Replace ball bearings if not within the following limits. 6.   Measure outside diameter (28) of ball bearings (20). Replace ball bearings if not within the following limits. REF NO. POINT OF MEASUREMENT SIZES AND FITS OF NEW PARTS inches (mm) WEAR LIMITS 26 Outside diameter of bearing hubs on spur gearshaft 1.3781 (35.0037) 1.3785 (35.0139) 1.3779 (34.9986) 27 Inside diameter of ball bearings 1.3775 (34.9885) 1.3780 (35.0012) none 28 Outside diameter of ball bearings 2.8341 (71.9861) 2.8346 (71.9988) none Figure 29 7 20 27 28 26 26