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 TM 55-1905-217-34
Key to figure 4-1.
1. Self-locking nut
29. Field wire
2. Flat washer
30. No. 10-24 x 3/4 in. carriage bolt
3. Driven pulley
31. No. 8 x 1/2 in. tapping screw
4. Fan
32. Shunt lead insulator
5. Flat washer
33. Brush assembly
6. Felt washer
34. No. 4-40 x 1/4 in. lock screw
7. Pulley spacer
35. Stud cap
8. No. 10-32 x 1 in. retainer screw
36. Insulating washer
9. Front housing
37. Thru bolt
10. Grease seal
38. No. 12 lock washer
11. Ball bearing
39. 1/4-28 hex nut
12. Retainer gasket
40. 1/4 in. lockwasher
13. Front bearing retainer
41. Flat washer
14. Woodruff key
42. Insulating washer
15. Rotor assembly
43. Rear housing
16. Ball bearing
44. Bearing retainer
17. Slip rings
45. No. 10-24 x 1 1/8 in. carriage bolt
18. No. 10 lock washer
46. Isolation diode assembly
19. No. 10-32 x 5/8 in. hex socket screw
47. 1/4-28 acorn nut
20. Stator assembly
48. Insulator
21. No. 10-24 hex nut
49. Terminal lug
22. No. 8 x 3/4 in. tapping screw
50. 1/4-28 x 1 1/4 in. carriage bolt
23. Flat washer
51. Diode ring insulator
24. Insulating washer
52. 1/4-28 x 2 1/8 in. carriage bolt
25. Rear cover
53. Negative rectifier diode heat sink
26. Cover gasket
54. Negative rectifier diode heat sink
27. Terminal insulator
55. Positive rectifier diode heat sink
28. Flat washer
56.Positive
rectifier
heat
sink
(2) Remove self locking nut (1) and washer (2) from the shaft.
(3) Pull alternator from the pulley (3). A slight rocking of the alternator body will help loosen a tight pulley. Remove fan (4).
(4) Remove two tapping screws (22) and remove the rear cover (25) and cover gasket (26).
(5) Remove two lock screws (34) connecting clips to terminals.
(6) Remove two tapping screws (31) securing the brush assembly (33) and insulator (32) to the housing.
(7) Remove four thru bolts (37) and lock washers (38) which hold front and rear sections together. Use a screwdriver and a
wedge to pry the halves apart at the housing "ears".
CAUTION
Do not insert sharp tools (screwdriver, etc.) between stator and housing. They may cause
permanent damage to the stator windings or laminations.
(8) After the alternator has been opened, push against the outer slip ring with thumb to completely separate the two sections.
NOTE
When the alternator is separated, the rotor assembly will come out with the front housing; the stator
will come out with the rear housing.
d. Disassembly of Rear Housing Assembly (Hulls 8500-8519 and 8520-8539).
NOTE
Make a note of all washers and insulators that are removed so they can be properly replaced during
reassembly.
(1) Remove three stud caps (35, fig. 4-1) and hex nuts (21) from three-phase winding carriage bolts (45) and disconnect stator
wires.
(2) Separate stator assembly (20) from the rear housing (43).
(3) Remove three hex nuts (21) securing carriage bolts (45) to rear housing. Remove the carriage bolts, washers (18, 23, 36,
38), and terminal insulators (27).
(4) Remove the screw securing the ground lead to the negative rectifier diode heat sink (53).
(5) Remove hex nuts (39) and washers (40, 41 and 42).
(6) Remove entire diode assembly (with isolation diode attached)-from housing.
(7) Remove two acorn nuts (47) and washers (40, 41 and 42). Separate the isolation diode assembly (46) from the diode
assembly. Remove carriage bolt (50), terminal lug (49) and insulator (48) from isolation diode assembly (46).
(8) Individual diode removal.
CAUTION
When applying soldering iron to a diode lead connection, grasp the diode connection terminal
with long nose pliers (between soldering iron and diode) to prevent overheating and thereby
damaging a diode.
(a) Unsolder the connecting wires from the diodes.
(b) Set the diode plate on a 3/4 inch to 1 inch diameter tubular tool or jig with the terminal facing down.
4-3
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