MCi Crusader II 1989 Maintenance Manual page 224

Date
1-1-89
Page
7-4
MC-9 MAINTENANCE MANUAL
Figure 7-7. Checking Diodes for Shorts Using Ohmmeter.
DISASSEMBLY
The alternator may be disassembled by following the steps
below: refer to figure 7-9:
1. Remove nuts and washers from DC terminal on diode end
frame.
2. Separate the diode cover plate (3) from the diode end
frame by removing mounting screws (1 ).
3. Remove the washer, nut and lock washer attaching the
diode supports to the end frame, the three screws (5) connect-
ing the diode leads to the diode supports. and the three nuts (4)
which attach the stator studs to the diode supports.
4. Separate the diode support assemblies from the diode
end frame, and the three nuts (6) which connect the studs to the
diode end frame.
5. Mark the position of the drive end frame and diode frame
with respect to the stator assembly so that the parts can be
reassembled in the same position.
6. Detach the diode end frame and field assembly from the
stator assembly by removing the attaching screws (13).
7. Separate the field assembly from the diode end frame by
removing the four attaching screws (11 ).
8. Separate the rotor assembly and drive end frame from the
stator assembly by removing the attaching screws (25).
♦
-
Figure 7-8. Checking Stator Windings
for Opens and Grounds.
9. Remove the shaft nut and washer. and the pinion gear.
Press the rotor shaft out of the drive end frame.
1
o.
Remove the retainer plate (20) and pull the bearings fr?m
the drive end frame.
NOTE: When tightening the outside nut on
the DC output terminal, torque the nut to
30-35 ft. lbs. (41-47 Nm). The lower nut
should be held secure while tightening the
top nut.
REASSEMBLY
Reassembly is the reverse of disassembly. When installing
the single row bearing into the drive and frame. press against
the outer race only to avoid loading the bearings. Attach the
bearing retainer plate. and press against the bearing inner race
to force the assembly over the shaft To avoid pressure on the
bronze ring in the rotor. support the inside of the rotor against
the shaft. and place the shaft in an upright position to facilitate
the assembly procedure. Press against the inner race to force
the double row bearing over the shaft. When attaching the field
to the diode end frame. make sure the mating surfaces are
perfectly clean and tighten the mounting screw securely.
NOTE: When reinstalling diodes, tighten to
9-11 ft. lbs. (12-15 Nm) torque.