Don’t remove what you call mfu bolts, it’s a non serviceable unit. Remove drain bolt t1270365 and drain 90wt hypoid oil, then reinstall it with a small torque wrench to spec, be careful not to break it be very easy light, then remove only bolt t1270130 and fill with your oil 90wt gear oil until it runs out of that hole, reinstall fill bolt, and grease like mitzy said, language barrier I understand, don’t take that unit apart, not recommended to do that. Look in idk members signature and there you will find a service manual for use.