1. Screw (2)
2. Nut (2)
3. Lockwasher (2)
5. Screw (4)
6. Lockwasher (4)
8. Screw (4)
9. Lockwasher (4)
10. Screw (8)
11. Lockwasher (8)
13. End bell assembly
14. Screw (4)
15. Lockwasher (4)
16. End bell
17. Stator assembly
18. Nut (2)
19. Screw (2)
20. Terminal board
21. Screw (8)
22. Lock plate (4)
23. Pressure plate (4)
24. Screw (8)
25. Lock plate
29A. Screw (MEP-112A)
31A. Retainer washer
32A. Ball bearing
32B. Washer, Bellville
52A. Rotor (MEP-112A)
52B. Screw (MEP-112A)
52E. Balance weight
52F. Nut (MEP-112A)
Figure 8-1. Generator Exploded View (Sheet 2 of 2)
c. Disassembly (see figure 8-1).
(1) Remove screws (l), nut (2), lockwasher (3),
attaching screen (4) to generator and remove screen.
(2) Remove screws (5), lockwashers (6), attaching
end bell cover (7) to end bell and remove cover.
(3) Remove screws (8) and lockwasher (9), and
remove end bell assembly.
(4) Remove O ring (12) from bearing housing.
Remove and tag wiring harness from terminal board
(20). Remove screws (19) and nuts (18) attaching ter-
minal board to exciter stator and remove terminal
(5) Remove four screws (14) and lockwasher (15)
attaching exciter stator (17) to end bell (16) and re-
move exciter stator.
(6) Remove eight screws (24) attaching coupling
disk (27) to rotor shaft and remove coupling, lock
plate (25) and retaining ring (26).
(7) Remove generator fan (28) which is now free.
Do not remove balance screw from fan (28).
(8) Remove rotor assembly from stator assembly
(9) For MEP-003A, remove screw (29), lock-
washer (30) and flatwasher (31) attaching bearing (32)
to rotor shaft and remove bearing, bearing retainer
(33) and shaft collar (34). For MEP-112A, remove
screw (29), lockwasher (30), retainer washer (31A)
and Belleville washer (32A), attaching bearing (32)
to rotor shaft and remove bearing retainer (33) and
shaft collar (34).
(10) If necessary, remove diodes from rotor as
given in paragraph 8-2a above.
Do not remove exciter rotor from rotor shaft.
Do not remove balance weight (52E) from
d. Inspect. Visually inspect windings and lead con-
nections. Check that diodes are securely mounted on
heat sinks. Clean dust, dirt, and grease from diodes.
Clean windings and drain holes. Check that end bear-
ing is not damaged or worn. Inspect cooling fan and
coupling for damage.
e. Testing Exciter Stator (Field) (High Potential
Observe safety regulations. The voltages used
in this test are dangerous to human life. Con-
tact with the leads or the windings under test
may cause severe, and possibly fatal, shock.
Arrange the high voltage leads so that they are
not in a position to be accidentally touched.
Keep clear of all energized parts. Always re-
duce the test voltage to zero and ground the
winding under test before making any mechan-
ical or electrical adjustments on the equip-
ment. When grounding out windings which have
been tested, always connect the connection
wire to ground first, and then to the winding.
Never perform this test without at least one
other person assisting. Generator frame shall
be securely grounded.
(1) General. The high potential test is performed
to determine whether or not the insulation of the
equipment under test is defective. It is customary to
determine whether electrical equipment will withstand
normal voltage stresses by means of a test in which
higher voltages than normal are applied -for a definite