Hendrickson HXL5 - Page 8

8
T72007 A
HXL5
®
HUB MAINTENANCE PROCEDURES
IMPORTANT: End play can be checked with brake
drum installed or removed (preferred)� If
installed, ensure all brake drum wheel
fasteners are installed and tightened
to manufacturers specications before
checking end play�
2� Ensure hub hubcap mounting surface and end of
spindle are clean and totally free of any burrs or
debris�
3� Rotate hub at least 5 revolutions to ensure
bearings are fully seated�
NOTE: The hub MUST be rotated before performing
end play measurement� Rotation works the
rollers into their fully seated positions against
the bearing cone shoulder� Failure to rotate
hub could result in a false end play reading�
Figure 4: Checking end play
4� Attach dial indicator (Table 2) with magnetic base
to at surface at end of spindle (Figure 4)�
5� Adjust dial indicator so its pointer line of action is
parallel to spindle axis and touches hub’s hubcap
mounting surface� Ensure the plunger contacts
the hub on a surface that is smooth and fully
machined� Any regions with scratches, gouges or
non-cleanup should be avoided�
6� Check indicator for free movement in both
directions� Lightly push and pull on indicator arm
to verify plunger is free to move at least �005” in
each direction� If indicator bottoms out, readjust
until it is free to move �005” in both directions�
7� Zero indicator�
Rotate and
push hub
Figure 5: Checking inward end-play
8� Grasp hub ange, as shown in Figure 5, and push
the hub inward while rotating hub slightly in both
directions (15 - 30° between two holes) until the
dial indicator reading remains constant� Record
reading�
Figure 6: Checking outward end-play
9� While still grasping hub (Figure 6) pull hub outward
while rotating hub slightly in both directions (15 -
30° between two holes) until dial indicator reading
remains constant� Record reading�
10� End play is the total movement of the indicator�
Calculate difference between recorded values of
Step8 and Step9 to determine end play, record
value�
IMPORTANT: End play must be between 0�001”
(0�0254 mm) and 0�005” (0�0127 mm)�
If subsequent readings are necessary,
the hub must be rotated at least 5
revolutions to reseat the bearings (refer
to Step3)�
Rotate and
pull hub