Ford 2013 F-650 Owner's Manual page 228

Checking the Fluid Level
See the Scheduled Maintenance chapter for rear axle lubricant level
check intervals.
1. Park the vehicle on level ground.
2. Set the parking brake and shift into position N or P (automatic
transmission), or first gear (manual transmission). Turn the engine
off.
3. Clean any dirt from around the rear axle filler plug.
4. Remove the filler plug and inspect the lubricant level. It should be at
the bottom of the filler plug opening.
5. Add lubricant, if necessary, through the filler plug opening.
6. Clean and install the filler plug securely.
Changing the Fluid
See the Scheduled Maintenance chapter for rear axle lubricant change
intervals.
1. Drain the rear axle while the lubricant is warm.
2. Park the vehicle on level ground.
3. Set the parking brake and shift into position N or P (automatic
transmission), or first gear (manual transmission). Turn the engine
off.
4. Clean any dirt from around the rear axle filler and drain plugs.
5. Remove the filler and drain plugs. Drain the lubricant into a suitable
container. Dispose of all used automotive fluids in a responsible
manner following your local authorized standards.
6. Clean and install the drain plug securely.
7. Add lubricant through the filler plug opening.
8. Clean and install the filler plug securely.
2013 F-650/750 (f67)
Owners Guide gf, 2nd Printing, March 2013
USA (fus)
Maintenance 227