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10 Withdraw worm wheel (635) together with needle roller bearings (535)
and thrust washers from the housing.
11 Examine and replace worn out parts.
Re-assembly
1 Fill gearbox with Castrol AP-3 grease or lithium based equivalent.
2 Re-assemble the unit in the reverse manner maintaining the settings
marked ‘X’.
3 Ensure that all the moving parts are well greased and protected from
dust and dirt.