Service Manual

Z Master 500 Series
B. Damaged Shaft - when the shaft is
worn at the point where the upper
bearing is located in the assembly, it
is a result of the assembly running
loose. The cause for this is improper
torque on the pulley hub retention
nut. This allows individual compo-
nents of the assembly to move and
wear.
12. Remove the seals, note the direction the
seals face. This will be important during
re-assembly. The upper seal faces
inward, and the lower seal faces outward.
If the lower seal is installed incorrectly, the
lower bearing spacer will crush the seal
and allow dirt into the assembly causing
bearing failure to occur. This orientation of
the lower seal also allows grease to
bypass the seal, purging old grease from
the spindle when fresh grease is supplied.
13. Remove the bearing cones and inner
spacers.
Note: There is a long spacer and then a
machined "C" spacer.
Note: When removing the bearings, tag or
isolate the top bearing from the lower
bearing. This will allow the bearings to
be installed in their original operating
position. Failure to do this may cause
premature bearing failure when
reassembled.
Inspect the bearings as follows:
A. Look for the presence of grease, par-
ticularly in the upper bearing. Dry or
cooked grease indicates a lack of
maintenance.
B. Look for dirt in the grease. This indi-
cates a bad seal or worn lower bear-
ing spacer. If the unit was recently
rebuilt, look for proper installation of
the lower seal.
C. Clean the bearings and look for any
pitting or flaking on the rollers.
D. Roll the clean bearings in your hand
and feel for rough spots. If the bear-
ing catches or the rollers get stuck in
10 Spindle Repair Module
Nut
Square Key
Bearing
Shield
Seal
Bearing
Shield
Spindle
Shaft
Seal
Bearing Cone
Machine “C” Spacer
Bearing Cup
Inner Spacer
Heavy Washer
Pulley Hub
Seal Spacer
Spindle
Housing
Seal Spacer
Outer Spacer
Bearing Cup
Snap Ring
Bearing Cone