Conmet Conventional - Hub, Drum and Wheel Inspection; Abs Tone Ring Inspection (as Applicable); Removal and Installation of Abs Tone Ring; Removal and Installation of Stamped Steel Abs Tone Ring

PreSet Wheel Hubs – Recommended Service
21ConMet
5. PreSet Wheel Hubs – Recommended Service
Excessive force can cause the stud head to be
embedded into the hub, which can create a crack
in the hub, resulting in serious injury and property
damage. If a stud head is embedded in a hub,
replace the hub.
WARNING
!
HUB, DRUM AND WHEEL
INSPECTION
1. Inspect the drum pilots, wheel
pilots, and mounting face on the
hub for damage. A damaged
drum pilot is usually caused
by improper drum mounting. A
damaged wheel pilot could be
the result of inadequate wheel
nut torque, allowing the wheels
to slip in service. Also, inspect
other surfaces of the hub for
signs of cracks or damage.
2. Inspect the wheels and brake
drum for damage.
Do not repair or recondition wheel-end
components. Replace damaged, worn or out-of-
specication components. Do not mill or machine
any components. Using repaired, reconditioned,
damaged or worn components can cause wheel
end failure, which can result in serious injury and
property damage.
WARNING
!
ABS TONE RING
INSPECTION (AS
APPLICABLE)
The Anti-Lock Braking System
(ABS) signals acts like any signal
generator where the magnet
passes a coil and generates a
current. On hubs, the toothed ring
passes a sensor and generates
a signal that is sent to the ABS
computer. There are three types of
ABS rings used on ConMet hubs —
machined, stamped steel and bolt
on (see gure 48).
11
106805b
MACHINED
ABS RING
STAMPED STEEL
ABS RING
BOLT ON
ABS RING
FIGURE 48
If the tone ring is damaged (for
example, if it is dropped, bent,
chipped or dinged), it must be
replaced. For a list of replacement
ABS rings, refer to the Service Parts
List in the back of this section.
REMOVAL AND
INSTALLATION OF
MACHINED ABS TONE
RING
For a machined metal ring, remove
using a chisel, making sure not to
damage the hub (see gure 49).
Reinstall by heating the ring to
350°F in an oven and installing it on
the hub.
12
106806a
Machined ABS Ring
FIGURE 49
REMOVAL AND
INSTALLATION OF
STAMPED STEEL ABS
TONE RING
1. The steer axle tone ring can be
removed by gripping the ring
with a pair of locking pliers and
tapping the pliers upward with
a rubber mallet. Work around
the ring to keep the ring from
cocking (see gure 50). Drive
axle and trailer tone rings can
be removed by gripping the
ring with a pair of locking pliers
and prying against the head of
a wheel stud to lift the ring off
the hub. Work around the ring to
prevent cocking (see gure 51).
13
106807a
Stamped Steel ABS Ring
FIGURE 50
14
106808a
Stamped Steel ABS Ring
FIGURE 51