TM 9-2320-289-346-15.1. REAR AXLE DIFFERENTIAL MAINTENANCE (M1028A2) (Con’t).NOTEIf ring gear (12) and drive pinion were replaced, perform steps 10-13 tocheck for proper gear tooth contact pattern.10.Wipe any lubricant from axle housing and clean each tooth of ring gear (12).11.Using medium stiff brush, sparingly apply prussian blue dye to all ring gear (12) teeth. Area ofdrive pinion tooth contact should be visible when drive pinion is turned by hand.NOTEExcessive turning of ring gear (12) is not recommended. Ring gear shouldbe turned only enough to provide tooth contact pattern.12 .Apply load until it takes a torque of 40-50 Ib.-ft, (54-68 N.m) to turn drive pinion. Turncompanion flange so that ring gear (12) turns 1 full revolution, then reverse so that ring gearturns 1 full revolution in opposite direction.13.Contact pattern should be centrally located up and down on face of ring gear (12) teeth.Compare tooth contact pattern on ring gear with examples shown and make adjustments asindicated. (See paragraph 6-17.1, subparagraph c, steps 1-3)Change 16-103.11
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