Note. - When pressing the bearing out of the housing, force should be applied to
the outer race to avoid the possibility of damaging the bearing.
b. Remove the two roundhead screws and guard washers which secure the brush
holder and lift the brush holder out of the way. Remove the brushes by pulling
them out of the holder.
c. Remove the socket-head screw and washer that retain the fan; pull the
fan off of the rotor shaft. Remove the key from the shaft.
d. Remove the six socket-head screws which secure the antidrive end housing
and pull the housing and rotor assembly out of the stator and intermediate housing
assembly.
Note. - In some cases the bearing may remain in the housing; in other cases it may
remain on the shaft.
e. After visually inspecting the intermediate seal, replacement is
accomplished by pressing the seal out of the housing. Discard seal after removal.
Note. - A new seal should always be used when reassembling alternator.
14.
DIODE REPLACEMENT. If electrical tests indicate one or more defective
diodes, the following procedures should be followed. Unsolder the lead from
defective diode and push the lead aside. With a sharp knife, carefully remove the
RTV rubber sealant from around the diode and unscrew the diode using an 11/16-inch
deep well socket wrench. After the diode has been removed, check the mounting
surface of the heat sink for burs or foreign matter which would prevent the new
diode from seating properly. It is very important that the diode seat firmly
against the heat sink to insure proper heat transfer as well as electrical contact.
Note. - Diodes used in the negative (grounded) heat sink differ from those used in
the positive (ungrounded) heat sink. If they are interchanged, serious
damage will result. Consult figure 11 to insure proper diode
identification and position. Insert the proper diode, tighten to 20 to 25
inch-pound torque and reconnect the lead. When resoldering, do not use
excessive heat which could damage the diode. Reseal the diode by applying
RTV sealant around the diode.
Figure 11.
Diodes.
OS 010, 2-P9
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