TM  10-3930-653-14&P GEAR AND BEARING INSPECTION (1)   To know  how  much  a  gear  is  worn,  measure  the  displacement  over  a  given  number  of  teeth  of  the  gear.  If  the measured value is beyond the useful limit, the gear should be replaced with a new one. Damaged gears, If slightly, may be repaired by an oil stone or pencil grinder. Fig. 4-316.  Checking Displacement over a Given Number of Teeth of a Gear. Fig. 4-317.  Gears To Be Inspected Unit: mm (in) Checking Item Standard Value Service Limit 32.429-32.526 32. 279 Displacement over four (4) teeth of drive gear (1.2767-1.2806) (1.2708) Displacement over four (4) teeth of counter drive gear 26.909-26.993 26.759 (1.0594-1.0627) (1 0535) Displacement over four(4) teeth of output gear 32.488-32.578 32 338 (1.2791-1.2826) (1.2731) 32.429-32.526 32.279 Displacement over four(4) teeth of reverse idle gear (1.2767-1.2805) (1.2708) Displacement over four (4) teeth of idle gear shaft 26.909-26.993 26.759 (1.0594-1.0627) (1.0535) (2) Measure    inner    diameters    of    drive    gear    and counter  drive  gear,  and  if  each  measurement  is beyond service limit, replace gears. Unit: mm(in) Checking Item   Standard Value Service Limit 37.009-37.025 37.050 Inner diameter of drive gear    (1.457-1.458) (1.459) Inner diameter of counter 43.009-43.025 43.050 drive gear (1.6933-1.6939) (1.6949) Fig. 4-318.  Measuring Inner Diameter of Gears 4-170