Grinder,
If you are still looking for information for your knuckle oil leak, contact Messicks.com. They will give you a parts breakdown sheet and you can order the seal assembly. If your L3010 is anything like my L3130, pretty straightforward in replacing the seal. Just need a couple of good large snap ring pliers as the snap rings are beefy.
Good Luck,
David
PS I put off replacing the seal as I needed the tractor for a job. Added oil the axle for 6 months or so. Just checked it every few days.