4x4 Maintenance

[KoonHunter51]

FarmPro 2430 4x4 (Jinma 304)
What is the lubrication & maintenance procedure for the 4x4 components.?

After 2 days of bush hogging a large blackberry thicket, there is a little whiny noise when in 4x4.
I just realized when l drained & replaced all the fluids, l did not address the 4x4.
The transmissin gear box/rearend & front axle oil was changed.
Thanks,
David

 

[KoonHunter51]

I found where a grease fitting was supposed to be in the driveshaft, it was broke off but a easy-out removed it.
Put a new 10mm fitting in & grease