Have a question on Seals for the drop axel, if the seals are going does this mean barings also need to be replaced usually?
It is my experience that when the hub seal starts to leak it is usually due to the hub bearing starting to fail.
To check the hub bearing jack up the mule so the wheels are off the ground
Grab the wheel at 12 and 6 o'clock and rock in and out.
Do not grab the wheel at 9 and 3 o'clock, movement will include loose or worn steering linkage.
There should be no movement if very slight then no replacement of the bearing is needed
Replace with a neoprene seal National 473455 or Emery mules may have repro original using neoprene instead of leather.
If there is better than slight or lots of movement then replace with a 5208 bearing.
Double check that the movement is not due to steering knuckle pin not properly shimmed.