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8-38
ALTERNATOR AND REGULATOR
(c)
Cut
through the copper of both slip rings at op-
(d) Break the insulator and remove the old ring.
(e) Clean away dirt and particles of the old slip
ring from the rotor.
(f)
Scrape the ends
of the field coil lead wires clean
for good electrical contact.
(g) Scrape one end (about
3/16
inch) of a piece of
bare
wire
(approx.
18
gauge) three inches long,
(to
be
used as a guide wire).
(h) Tin the scraped area of the guide wire with
resin core solder. Lap the tinned end of the wire over
the field coil lead to the insulated ring and solder the
two together.
(i) Position the new slip ring carefully over the
guide wire and the rotor shaft so the wire
will
lay
in the slip ring groove (Fig. 32). The groove in the
slip ring must be in line with the insulated brush field
lead to provide room for the lead without damaging it.
(j) Place installing Tool C-3900 over the rotor shaft
with the guide wire protruding from the slot in the
tool.
(k) Position rotor, slip ring and tool assembly in an
arbor press (Fig. 33). Pull up on the guide wire
being careful to guide the insulated field lead into
the slip ring groove. While guiding the insulated field
lead through the groove, press the slip ring on the
shaft. When the slip ring is bottomed on the rotor
fan the end of the field lead (insulated brush ring)
should be visible at the solder lug (Fig. 30).
(1) Unsolder the guide wire from insulated brush
slip ring lead. Press the field lead into the solder lug
and solder the lead to the lug with resin core solder.
posite points (180" apart) with a chisel (Fig. 31).
F -
1
Q
I
Fig. 33-Insfalling
the Slip Ring
ROTOR
63x43
Fig. 34-Installing
Bearing Grease Refainer
CAUTION:
Be sure the solder bead does not pro-
trude beyond the surface of the plastic material.
Do not use acid core solder as a short circuit may
result and corrosion
will definitely occur.
(m) Coil the ground brush ring field lead around
the solder lug and solder with resin core solder.
(n) Test the slip rings for ground with
a
110 volt
test lamp by touching one test lead prod to the rotor
pole shoe and the remaining prod
to
the slip rings.
Test lamp should not light. If lamp lights, slip rings
are shorted to ground, possibly due to grounding
insulated field lead when installing the slip ring.
If the rotor is not grounded, lightly clean the slip
ring surfaces with -00- sandpaper.
( 0 )
Position the grease retainer insulator and
grease retainer on the rotor shaft and press the re-
tainer on the shaft with installer Tool C-3921 Fig. 34.
The retainer is properly positioned when the inner
bore of installer tool bottoms on the rotor shaft.
ASSEMBLING THE ALTERNATOR
(1)
Check the rectifier identification to make sure
the correct rectifier is being installed. Refer to the
Parts List for rectifier identification.
(2)
Start the rectifier squarely into the mounting
hole.
(3)
Support the heat sink or rectifier and shield on
the installer adapter of Tool C-3928. With the in-
stalling adapter positioned on the rectifier, carefully
apply pressure with the tool pressure screw until the
installer tool, rectifier, rectifier end shield or heat sink
are in alignment and after determining that the rec-
tifier is started squarely in the casting, slowly apply
pressure with the tool pressure screw until you feel
the collar of the rectifier bottom against the casting
(Fig. 35).
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