An addendum to my comment on John Deere Corn Head Grease: The steering box on our '24 DB has only a grease fitting to fill the box. I removed the fitting and used a needle attachment at the end of my regular grease gun to shoot the grease deep into the box. At the same time, I jacked the front end just so the wheels would clear the pavement and then ran the steering back and forth, from end to end, in order to work the grease into the gearing as much as possible. Refill to the filler hole and repeat.