It should have cheesehead screws retaining the inner cover...:laughing:
More seriously, have it apart and check everything for wear, there will probably be some..Replace worn parts as required, reshim if necessary and reassemble...If things are within limits it should work...
However, bear in mind these gearboxes are NOT designed to select gears when static...Movement and the inertia of the various moving parts when running are needed for correct dog engagement etc...Ian
