SECTION 09: PROPELLER SHAFT
DOB 1300-1556 | X3-45 Commuter PA-1648 Maintenance Manual (Draft Version – April 2020)
FIGURE 3: BEARING LUBRICATION ZIRK
FIGURE 4: BEARING LUBRICATION
3. If any of the seals fail to purge, try to
move the propeller shaft from side-to-
side while applying grease gun pressure.
a) If all four bearing positions still do not
purge, releasing seal tension may be
necessary.
b) Remove the bearing retainer bolts and
bearing retainers and discard. Do NOT
reuse.
c) Once the bearing cups are free, allow
the propeller shaft to rest on the support
strap.
d) Apply a c-clamp around the inboard
bearings.
FIGURE 5: C-CLAMP
e) Apply grease gun pressure. Completely
purge both bearings.
f) If bearings still do not purge, complete
the removal of the u-joint and inspect for
blockage.
g) If the u-joint still do not purge at all four
positions after following the steps in this
procedure, replace the u-joint.
4.2 INSPECTION RECOMMENDATIONS
1. U-joint inspections should be performed
every time a vehicle comes in for
scheduled maintenance.
2. Visually inspect for damaged bearing
retainers, loose bearing retainer bolts,
loose companion flange, bolts and nuts,
loose or missing spring tabs or spring
tab bolts, damaged tangs on end fittings,
damaged or missing rotating bearing
cups. If any of these situations are
evident, replacement of the component
is necessary.
3. Check all input and output end fittings
for looseness. Take hold of the end
fitting with both hands. Try to move it
vertically and horizontally to feel any
looseness.