Ford F-650 2015 Owner's Manual page 251

250
WHEELS
General Information
Note: Remember to replace the wheel air valves when replacing the road
tires at the end of their useful lives.
Inspect, lubricate and adjust wheel bearings at regular intervals. This is
especially important if operating in deep sand, mud or water. See the
Capacities and Specifications chapter.
Mount wheel balance weights on the dome-side of the wheel only. Failure
to do so may result in loss of wheel weight or damage to brakes or
wheels.
Oil-lubricated Front Wheel Bearings
During normal vehicle duty cycle, the lubricant and air inside the
hub/wheel cavity expands and, if not vented, causes pressure build-up
that could cause accelerated seal wear. You can use two venting methods
to prevent pressure build-up:
• A slit or small hole in the rubber check vent
• The window.
Over a period, if not routinely cleaned, a slight film of oil can collect dirt
around the rubber fill plug and face, which could appear to be a leak.
Routine cleaning helps make sure that you can easily observe the
lubricant level through the window as intended. In situations where the
window is clean on the outside but discolored on the inside, you can
check the lubricant level by inserting a finger through the rubber check
vent hole.
The specified lubricant level for a window-type hubcap is from the
minimum line to five–sixteenth inch (8 millimeters) above the minimum
line. If the lubricant level should suddenly drop dramatically below the
minimum level, see the Workshop Manual for diagnostic procedure.
Installation, Tightening and Alignment
Make sure the threads on the studs and nuts are clean to permit correct
torque when installing wheels. The mounting surfaces of rims, wheels,
spacer rings and clamps must be free of dirt, rust, lubricants or damage.
Use a wire brush to clean the mounting contact surfaces. Do not use
lubricant on threads.
2015 F-650/750 (f67)
Owners Guide gf, 2nd Printing, April 2014
USA (fus)
Wheels and Tires