10.FINAL REDUCTION/ TRANSMISSION SYSTEM MXU 250R/300R Secondary Drive Bevel Gear Cover SECONDARY GEAR SHIMS (MXU 300R) Remove three bolts and secondary drive bevel gear cover. Bolts Drive Bevel Gear Driven Bevel Gear Set a dial gauge on the driven bevel gear as shown. Measure the backlash by turning the driven bevel gear shaft in each direction, reading the total backlash on the dial gauge. If the backlash is not within specification, the shim must be changed and the backlash should be rechecked until correct. Refer to the chart (a) at the page 10-41 for appropriate shim thickness. Bevel gear backlash Standard: 0.03 - 0.15 mm (0.001 0.006 in) If the backlash is too small (under 0.03 mm, 0.001 in), replace the driven bevel gear side spacer with a thinner shim. If the backlash is too great (over 0.15 mm, 0.006 in), replace the driven bevel gear side spacer with a thicker shim. Driven Bevel Gear Shaft 10-39