Wheel Hubs/Bearings - Midland SIDE DUMP GRAVEL TRAILER Operator's Manual

5.2.5

WHEEL HUBS/BEARINGS

All axles use an oil bath design for lubricating wheel
bearings. It is a virtual zero maintenance system
providing that the oil remains in the hub.
Visually check the hub every day for leaks when
checking tire pressure during pre-trip, daily, refuelling,
or rest stop inspections. If oil leaks are detected
on any hub, repair the leak and refill the hub before
proceeding.
A. Oil Leaks:
Visually inspect the hub for leaks
every time the tire pressures are
checked. Leaks will normally be
visible as dust collects on the
escaping oil. Stop and correct the
leak immediately to prevent running
the hub low on oil. Running low or
without oil will quickly overheat the
hub and cause the bearings to seize.
Change the oil in the hub when
installing new seals to correct a leak.
B. Oil Levels:
1. Check the oil level in each wheel
hub every 5,000 miles (8,000 km)
or weekly and whenever an oil
leak is found. Clean the end plate
of the hub to remove the dust, dirt
or mud build-up.
The oil should be visible to the top
of the outer concentric circle
of the end cap. Add oil as
required through the fill plug in the
hub. Always use clean oil and
prevent contaminants from
entering the hub when adding or
changing oil.
2. Change the oil every 100,000
miles (160,000 km), annually or
whenever the axle nuts are
retorqued or the brakes are
relined. The hub cavities must be
opened when retorquing axle nuts
or reiling the brakes and changing
oil should be done as part of the procedure.
Fig. 47 OIL LEVEL
Hub
51