TM 9-2320-289-346-5.FRONT AND REAR AXLE DIFFERENTIAL REPLACEMENT (M1009) (Con’t).7 .Remove bearing preload gage (13), spacer if installed, shim (5), and feeler gage (11).8 .Measure thickness of bearing preload gage (13) in 3 places and average these readings.Record the result.9 .Measure combined thickness of spacer if present, shim (5), and feeler gage (11).10.Using example given in Table 6-1, determine proper thickness of each shim pack,Table 6-1. Determining Side Bearing Shim RequirementsOPPOSITE SIDEinchesmillimetersinchesmillimeters0.250 In.6.350 mmThickness of bearingCombinedtotal of0.265 In.6.731 mmpreload tool requiredspacer, service shim,to force ring gear Intoand feeler gage.contact with drive pln-Ion.TO MAINTAIN PROPER BACKLASH (0 .005 In. --0.010 In.-0.254 mm0.008 in. ) (0.127 mm - 0.2032 mm), ring gear ismoved away from pinion by subtracting 0.010 in.+ 0.010 in.0.240 in.+ 0.254 mm6.096 mm(O .254 mm) shims from ring gear side and adding0.275 in.6.985 mm0.010 in. (0.254 mm) shims to the opposite side.1+0.004 in.TO OBTAIN PROPER PRELOAD on side bearings,+ 0.102 mmadd 0.004 in. (0. 102 mm) to each side.+ 0.004 in.+0.102 mm0.244 in.6.198 mmShim dimension re-Shim dimension re-0.279 in.7.087 mmquired for ring gearquired for oppositeside,side.RINGGEARSIDE11.If present, install 2 spacers as tagged, between bearing cups (6) and housing.NOTEl Production preloading of the differential side bearings (10) isaccomplished by use of cast iron preload shims. These cannot bereused when rebuilding the housing as they may break when tappedinto place. Service shims may be reused if not damaged.• Chamfered side of shim (5) should face outward. Shim should havesufficient chamfer or lead around outside diameter to allow for easyinstallation. Additional chamfer on shim should be filed or ground asrequired.6-19
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