How to service gear case on Honda435u brush cutter

Under normal cercumstances you don't require to service this, except greasing the gears and that is done as... There is a L key bolt on the right side of the pipe (you should own a L key set) above the blade you are useing,,open the bolt in the normal direction means anti clock wise than insert grease in to the opening till it doesn't start coming out by it self that means its full. Replace the bolt but don't tighten it too hard because it can create problem to open next time.when you now run the brush cutter it will run smooth. On ther hand if there is any other problem than this like gears are broken or something than replace the entire assembly