ROTOR BEARING REPLACEMENT
The rotor bearing is pressed onto the rotor shaft. This
bearing must
be
replaced very carefully
to
avoid damag-
ing the collector ring assembly and the rotor shaft. Use
the following procedures to replace the rotor bearing.
1.
2h.
28.
Measure and record the distance between the bear-
ing and the collector ring assembly, (referenced
later for reassembling). See Figure
8-1
3.
The bearing casing
is
made
of
k!@@&%l
hardened steel. When struck,
it
will shatter into smallpieces and can cause severe
personal injury. Use protective eye wear and cloih-
ing when replacing the rotor bearing.
ACAUT~ON
Heating the rotor bearing
for
D
removal or installation can
cause damage to the bearing and the collector ring
housing.
Do
not heat the rotor bearing.
If
available, use a small puller with grips that will fit
between the bearing and the collector ring assem-
bly. Cover the end of the rotor shaft with a steel plate
to prevent deformation of the shaft during removal.
If
a suitable puller is not available, wrap the collector
ring with a cloth for protection and cut off the outer
race of the bearing using a small hand grinder with a
cutting wheel. Be careful to avoid cutting the collec-
tor ring assembly. Remove the bearings and make
two cuts approximately halfway through the inner
race
180"
apart. See Figure
8-1
4.
Place rotor with
one cut face down on a hard surface and center a
cold chisel on the other cut and strike to split apart.
Be careful not to damage the rotor shaft. The bear-
ing casing is made of hardened steel that can shat-
ter into small pieces. Use protective eye wear and
clothing to protect yourself from injury when striking
the bearing casing.
Inspect the rotor shall for dirl
or
corrosion.
If
necessary, clean
with
emery
cloth before before installing new bearing.
MEASURE
SPACE BETWEEN
BEARING
AND
COLLECTOR RING
-
-
ASSEMBLY
11
3.
Place the rotor shaft, engine end down, onto a
1-
1/16
inch
(27
mm)
O.D.
steel shaft or use
a
plug
mated
to
the engine end of the rotor shaft to protect
the shaft taper from damage when pressing bearing
into place.
4.
Refer to measurement taken in step
1.
Press bearing
onto rotor shaft (press on inner race only) until
it
rests at the same distance from the collector ring
assembly as the original bearing.
Do
not place bear-
ing closer than
0.14
inches
(3.5
mm)
to the collector
ring or arcing can result. Check bearing seal for
damage after installation.
6-1215
FIGURE
8-14.
ROTOR
BEARING REMOVAL
ROTOR
BEARING
COLLECTOR RING ASSEMBLY
6-1216
FIGURE
8-13.
ROTOR
BEARING SPACING
8-1
5
To Next Page
Loading...
Need help?
General
