Remove Front Bearing from Housing:
Remove three bearing retainer screws. Position housing on support blocks placed on an arbor
press. Using a tool that contacts inner race of bearing, press out front bearing.
See illustrations below.
(3)
BEARING RETAINIER
SCREW
REMOVING RETAINER SCREWS
Inspect Front Housing:
BEARING INNER RACE
PRESSING
OUT
BEARING
Check housing for cracks. Check condition of threads in adjusting
ear.
Check bore in mounting
foot. Discard housing if bore shows signs of elongation (oval or out-of-roundness).
ROTOR
INSPECTION AND ELECTRICAL TESTING
Check the rotor assembly for the following electrical properties. See illustration on page
89.
A. Current Draw
or
Resistance of the Winding
CAUTION: Turn
off
DC
power
source
before
removing
test
leads
to
avoid avc
damage
to
slip
ring
surfaces.
1.
CURRENT DRAW IN AMPERES,
AT
70°
TO
80°F.
12 VOLT MODELS,
RATED
AT:
51
AMPERES
CORRECT
CURRENT DRAW
@ 15.0 V
3.2 to
3.6
AMPERES
2.
RESISTANCE
OF
WINDING IN OHMS,
AT
70°
TO
80°
F.
12 VOLT MODELS,
RATED
AT:
51
AMPERES
CORRECT WINDING
RESISTANCE
4.1
to 4.7 OHM
.
73
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