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TM 10-3930-644-14 & P
To install a new bearing, press in with a tube or
hollow cylinder to prevent breakage of the end
collar that just fits over the outer race, with the
frame. Use extreme care to avoid misalignment
bearing and slinger assembled into the end
or otherwise plating undue stress on the
frame  as  shown  in  Figure  2-12.
It  is
bearing.
recommended that a new retainer plate be
installed if the felt seal in the retainer plate is
If the seal is separate from the bearing, it is
hardened or excessively worn.  Fill the cavity
recommended that a new seal be installed
between the retainer plate and bearing with
whenever the bearing is replaced.  Press the
1948791 lubricant.
seal : n with the lip of the seal toward the rotor
when assembled, that is, away from the bearing.
Lightly coat the seal lip with oil to facilitate
assembly of the shaft into-the bearing.
9. Reassembly
Assembling the pulley assembly, remembering
to secure the rotor in a vise only tight enough to
permit tightening the shaft nut to 40-60 lb. ft. If
excessive pressure is applied against the rotor,
the assembly may become distorted. To install
the slip ring end frame assembly to the rotor and
drive end frame assembly, remove the tape over
the bearing and shaft, and make sure the shaft
is perfectly clean after removing the tape. Insert
a pin through the holes to hold up the brushes.
Carefully install the shaft into the slip ring end
frame assembly to avoid damage to the seal.
Figure 2-12. Drive End Bearing Assembly
After tightening the thru-bolts remove the brush
(Some models use flat washer
retaining pin to allow the brushes to fall down
instead of slinger)
into the slip rings.
The bearing in the slip ring end frame should be
10. Alternator Bench Check
replaced if its grease supply is exhausted. No
attempt should be made to re-lubricate and
To check the alternator in a test stand, proceed
reuse the bearing. To remove the bearing from
as follows:
the slip ring end frame, press out with a tube or
collar that just fits inside the end frame housing.
a. Make connections as shown in Figure 2-
Press from the outside of the housing towards
14,  except  leave  the  carbon  pile
the inside.
disconnected.
IMPORTANT:
Ground
polarity of battery and alternator must be
To install a new bearing, place a flat plate over
the same.  Use a fully charged battery,
the bearing and press in from the outside
and 10 ohm resistor rated at 6 watts or
towards the inside of the frame until the bearing
more  between  the  alternator  No.  1
is flush with the outside of the end frame.
terminal and the battery.
Support the inside of the frame with a
b. Slowly increase the alternator speed and
observe the voltage.
R-146-1
3-89

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