Front Axle Wheel Hubs; Front Axle Hub Bearing Inspection - PREVOST H3-41 Maintenance Manual

SECTION 13: WHEELS, HUBS AND TIRES

10. FRONT AXLE WHEEL HUBS

The FAG unitized hub bearings used on the NDS range of axles, are non-serviceable items. Bearings are
pre-adjusted, lubricated and have seals fitted as part of the manufacturing process. The bearings are
greased for life and there is no need or facility for re-lubrication.
FIGURE 17: FRONT AXLE HUB AND ROTOR ASSEMBLY
10.1 FRONT AXLE HUB BEARING
INSPECTION
MAINTENANCE
Front axle unitized bearing
Unitized bearing inspection should be made at
the intervals specified by the Lubrication And
Servicing Schedule
LUBRICATION & SERVICING..
1. Apply parking brake, raise wheels off the
ground and support axle on stands.
2. When the wheels are raised, they should
revolve quite freely without roughness.
16
PA1621 Maintenance Manual All Series | January 2017
in Section 24:
3. Place magnetic base of a dial indicator on
brake caliper and position dial indicator stem
against a convenient marked spot on face of
hub flange.
4. With dial indicator in position pull hard but
steadily on hub flange and oscillate at same
time until a steady reading is achieved.
5. Without releasing the pressure, turn bearing
so that dial indicator stem contacts marked
spot and note reading on indicator.
6. Push bearing flange hard and oscillate as
before until a steady reading is achieved.
7. Without releasing the pressure, turn bearing
so that indicator stem again contacts the
marked spot and note new reading on
indicator.