11.FINAL REDUCTION/ TRANSMISSION SYSTEM MXU 550EXi/MXU500i SECONDARY GEAR SHIMS ADJUSTMENT Set a dial gauge on the driven bevel gear as shown. Measure the backlash by turning the rear propeller 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 for appropriate shim thickness. Bevel gear backlash Standard: 0.03 - 0.15 mm Drive/Driven bevel gear shims: A: 0.6 mm Adjust the backlash by referring to the B: 0.65 mm C: 0.7 mm chart at the right and using the thickness of the removed shims ad a guide. D: 0.75 mm E: 0.8 mm Backlash Shim adjustment F: 0.85 mm Under 0.03 mm Decrease shim G: 0.9 mm thickness 0.03 0.15 mm H: 0.95 mm) Correct I: 1 mm Over 0.15 mm Increase shim J: 1.05 mm thickness K: 1.1 mm L: 1.15 mm Secondary Driven Bevel Gear Shim Secondary Drive Bevel Gear Shim 11-8