Conventional Hubs
ConMet conventional hubs feature
precision-machined aluminum or
iron castings and are available in
steer, drive and trailer configurations.
Hubs are supplied with bearing
cups and studs installed. Bearing
cones and seal are supplied by the
customer. Bearings must be adjusted
manually. See TMC RP618 specifics
of adjustment procedures.
18
106923a
ABS RING
INNER
BEARING
CONE
INNER
BEARING
CUP
OUTER
BEARING
CUP
OUTER
BEARING
CONE
LUBRICANT
FILL PLUG
OIL SEAL
Conventional Hub and Components
FIGURE 20
6
Conventional Wheel Hubs – Recommended Service
ConMet
4. Conventional Wheel Hubs – Recommended Service
When inspections indicate
that service is necessary on a
conventional hub, follow the
recommended service, inspection,
reassembly and reinstallation
instructions found in the following
section.
HUB REMOVAL AND
DISASSEMBLY
Vehicles on jacks can fall, causing serious personal
injury or property damage.Never work under a
vehicle supported by a jack without supporting
the vehicle with stands and blocking the wheels.
Wear safe eye protection.
WARNING
!
1. Park the vehicle on a level
surface. Block the wheels to
prevent the vehicle from moving.
2. Raise the axle until the tires are
off the floor.
3. Place safety stands under the
trailer frame or under each axle
spring seat (see figure 21).
19
1003159a
FIGURE 21
4. Remove the tire and wheel
assembly using procedures
specified by the wheel
manufacturer (see figure 22).
20
103160a
FIGURE 22
Sudden release of compressed air can cause serious
personal injury and damage to components.
Before you service a spring chamber, carefully
follow the manufacturer’s instructions to compress
and lock the spring to completely release the
brake. Verify that no air pressure remains in the
service chamber before you proceed.
WARNING
!
5. If the axle is equipped with
spring brake chambers,
carefully compress and lock
the springs so that they cannot
actuate (see figure 23).
21
103161a
FIGURE 23
6. For drum brakes, remove
the brake drum. Support the
drum during the removal
process to prevent damage
to the components. For disc
brakes, remove caliper per
manufacturers’ recommended
procedure.
If the hub to be disassembled is a drive hub,
remove the drive axle shaft, and capture the oil
(see figure 24).
NOTE
22
106803a
Removing the Drive Axle Shaft
FIGURE 24
7. Place a container under the
hubcap, or drive axle shaft
for a drive hub, to receive the
draining oil, then remove the
hubcap or drive axle shaft.
Do not reuse the oil. Correctly
dispose of the lubricant.
8. Examine the spindle nut to
determine the type of locking
system. Disengage the locking
device.
Do not loosen the axle spindle nuts by either
striking them directly with a hammer, or striking
a drift or chisel placed against them. Damage to
the parts will occur causing possible loss of axle
wheel-end components and serious personal
injury.
WARNING
!
9. Remove the spindle nut system.