8
Conventional Wheel Hubs – Recommended Service
ConMet
4. Conventional Wheel Hubs – Recommended Service
6. Apply a light oil to cleaned
and dried parts that are not
damaged and are to be
immediately assembled. Use
only the type of oil used by the
manufacturer. Do NOT apply oil
to the brake linings or the brake
drums.
7. If the parts are to be stored,
apply a good corrosion
preventative to all surfaces.
Do NOT apply the material to
the brake linings or the brake
drums. Store the parts inside
special paper or other material
that prevents corrosion.
INSPECTING BEARING
CUPS AND CONES
If you choose to reuse existing bearings at this
service, they must be inspected in accordance
with the bearing manufacturers recommended
guidelines.
CAUTION
!
If this inspection indicates that existing bearing
component(s) must be replaced, bearing cups and
cones must be replaced as a set.
CAUTION
!
After components have been
properly cleaned, visually inspect
the cups and cones for any wear
or damage. Reference TMC RP644
for proper component inspection
procedures.
REMOVING CUPS IN
ALUMINUM HUBS
1. If the bearing cup must be
removed from an aluminum
hub, remove it by welding a
large bead around the bearing
surface of the steel cup,
letting the assembly cool, and
removing the bearing cup (see
figure 27).
If a welder is not available, heat the hub in an
oven to a temperature not to exceed 300°F and
pound out the bearing cups with a hammer
and mild steel bar, being careful not to damage
the hub.
NOTE
25
106856a
Welding Bead
FIGURE 27
2. Inspect the bearing cup bore
for evidence of cup rotation or
spun cups.
-
If cup rotation exists, replace
the hub.
REMOVING CUPS IN
IRON HUBS
1. On an iron hub, remove the
bearing cup using a large
hammer and a mild steel bar
or a hydraulic press. Take
precaution to avoid damaging
the bearing cup bore and
shoulder.
2. Inspect the bearing cup bore
for evidence of cup rotation or
spun cups.
-
If cup rotation exists, replace
the hub.
INSTALLING A NEW CUP
IN ALUMINUM HUBS
To install a new cup in an aluminum
hub, it is recommended that
the hub be heated in boiling
water (212°F) or in an oven at a
temperature not to exceed 300°F.
Cooling the cup in a freezer to
32°F or below will further ease the
installation.
Do not overheat the hub as it may degrade the
heat-treated strength of the hub. Do not heat the
hub with a torch or open flame.
WARNING
!
Remove the aluminum hub from the
oven or water and carefully drop in
the new bearing cup being certain
it is fully seated. If the cup is loose,
allow a few seconds for it to heat up
and secure itself before moving the
hub. Use a 0.001″ to 0.002″ feeler
gauge to ensure the cup is fully
seated against the shoulder of the
bearing bore.
INSTALLING A NEW CUP
IN IRON HUBS
Iron hubs do not need to be heated
for bearing cup installation. Press
the bearing cup into the hub, being
certain that it is fully seated (see
figure 28). Use a 0.001″ to 0.002″
feeler gauge to ensure the cup is
fully seated against the shoulder of
the bearing bore.
26
105742a
Bearing Cup Pressed into Hub
FIGURE 28
