water can get in via the gathering chain drive shaft more so if the sprokets have been removed if i have water insid e the gear box you would be best to replace the needle roller bearings and the stalk roller bearings a quick pull out of the bung will soon tell you the truth good luck
I have a 40 series complete row unit for sale. Just rebuilt by dealer. New gears, rolls, plates. Does not have chains. Will take $1000 for it. let me know if interested. E-mail watfarms@starband.net