Ford 2013 F-650 Owner's Manual page 225

224
Automatic transmission fluid expands when warmed. To obtain an
accurate fluid check, drive the vehicle until it is at normal operating
temperature (approximately 20 miles [30 kilometers]). Verify that the
transmission fluid temperature gauge, located on the instrument cluster,
is within the normal range.
1. Drive the vehicle 20 miles (30 kilometers) or until it reaches normal
operating temperature.
2. Park the vehicle on a level surface and engage the parking brake.
3. With the engine running, parking brake engaged and your foot on the
brake pedal, move the gearshift lever through all of the gear ranges.
Allow sufficient time for each gear to engage.
4. Latch the gearshift lever in position P and leave the engine running.
5. Remove the dipstick, wiping it clean with a clean, dry, lint-free rag.
6. Install the dipstick making sure it is fully seated in the filler tube.
7. Remove the dipstick and inspect the fluid level. The fluid should be
in the designated area for normal operating temperature or ambient
temperature.
Low Fluid Level
Correct Fluid Level
temperature can be reached after approximately 20 miles (30 kilometers)
of driving.
2013 F-650/750 (f67)
Owners Guide gf, 2nd Printing, March 2013
USA (fus)
Maintenance
Do not drive the vehicle if there is
no indication of fluid on the dipstick
and the ambient temperature is
above 50°F (10°C).
The fluid should be checked at
normal operating temperature
196°F-216°F (91°C-102°C) on a
level surface. The normal operating