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ELECTRICAL
frame, connect one of the ohmmeter leads to the
CAUTION: Do not use 110-volt test lamps to check
end frame, and the other ohmmeter lead to the
diode lead and note the reading. (Fig. 14) Then
reverse the ohmmeter lead connections, and note
F. ASSEMBLY
the reading. If both readings are very low, or if
both readings are very high, the diode is
1. If diodes have been removed, press new ones
defective. A good diode will give one low reading
into place, using a tool which fits over the outer edge of
and one high reading. Check the other two diodes
the diode. Support the frame end and heat sink at the
in the end frame in the same manner.
same time.
CAUTION: Do not tap the diode into place, as the
shock may damage it and the other diodes.
2.  If removed during disassembly, replace by
pressing the bearing into the drive end frame, using a
collar that just fits over the bearing outer race. Attach
the retainer plate.
3. Secure the rotor in a soft-jawed vise with the
drive end up. Tighten the vise only enough to permit
tightening the shaft nut to the correct torque.
CAUTION: Excessive pressure will distort the rotor.
4. Slide the drive end assembly over the rotor shaft.
5.  Install the collar, fan and pulley.  Secure the
assembly with the nut tightened to 50-60 pounds-feet.
Remove the assembly from the vise.
6. To install a new slip ring end bearing, place a flat
plate over the bearing and press in from the outside
towards the inside of the frame until the bearing is flush
with the outside of the end frame. Support the inside of
the frame with a hollow cylinder to prevent breakage of
Figure 14.
the end frame. Use extreme care to avoid misalignment
or otherwise placing undue stress on the bearing.
c. An alternate method of checking the diodes is
to use a test lamp of not more than 12 volts in
7. Saturate the felt seal with SAE 20 oil, and then
place of the ohmmeter.
With the stator
install the felt seal and steel retainer.
disconnected, connect the test lamp leads across
each diode as described in item b. first in one
direction and then in the other. If the lamp lights
in both checks, or fails to light in both checks, the
diode is defective. When checking a good diode,
the lamp will light in only one of the two checks.
B-63

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