My John Deere 4 wheel drive tractor has two drive shafts. The one drive shaft is just about totally hidden and has greasable Zerks, one per U-Joint. The other shaft is completely accessible and it has sealed U-Joints! Go figure!
It just goes to prove, you really need top know your equipment and not just rely on "Bubba", the guy the "certified mechanic" sends out there to do the oil changes and grease jobs!!!
Good Luck, Be Safe and Above All, Don't Forget To Have Fun
2006 Fleetwood Discovery 35H, 2014 Honda CR-V, M&G Engineering Braking System