15. REAR WHEEL/AXLE/SUSPENSION DRIVING MECHANISM MXU 300/250 Remove he oil cap. (1) Rotate ring gear several turns in each direction. Check the gear tooth contact pattern through the oil filler hole. This will provide a contact pattern on the Incorrect: coated teeth of the gear. Contact at tooth top Compare the coated teeth to the examples shown in (1), (2) and (3). (2) Contact is normal if the machinist's layout dye to the approximate center of each tooth (example (2)). If tooth contact is found to be incorrect Correct (example (1) and (3)), the shim between the pinion gear bearing and pinion gear must be changed and the tooth contact re-checked until correct. (3) Tooth contact Shim adjustment Contact at tooth top Decrease shim (1) thickness Contact at tooth root Increase shim (3) thickness Incorrect: Contact at tooth root Make sure to check the backlash and shim thickness after the tooth contact has been adjusted, since it may have changed. Adjust the tooth contact and backlash until they are both within specification. If the correct tooth contact cannot be maintained when adjusting the backlash, replace the pinion gear and ring gear as a set. Pinion gear shims: A: 2.03 mm (0.0812 in) B: 2 mm (0.08 in) C: 1.97 mm (0.0788 in) For pinion shim replacement, see next page. 15-31