TM 9-6115-604-34
NAVFAC P-8-633-34
(38)
Make simple electrical repairs to the field coils, such as resoldering leads, wrapping frayed windings with
insulating s tape, and painting with insulating varnish MS355632. Solder in accordance with MIL-S6872,
using solder QQ-S571, Type SN 60, and rosin flux.
(39)
Replace the field coils for electrical shorts, opens, or grounds, and for oil soaking, or insulation obviously
damaged beyond repair. Replace the field coils as follows:
(a) Place a pole shoe spreader between opposite pole rotor shoes (58) and tighten it in place.
(b) Using a pole shoe screwdriver and an arbor press, remove the pole shoe screws (57), then remove
the pole shoe spreader and the pole shoes.
(c) Repeat steps (a) and (b), above, for the other two pole shoes.
(d) Remove the plain hexagonal nut (37), terminal lug (53), hexagonal nut (38), flat washer (40), and
field terminal washer (54).
(e) Push in the field coil terminal stud, and slip the field coils (61) out of the field frame (64).
(f)
Remove the field cod insulators (56), insulator plate (60), field terminal washer (54), and terminal
bushings (55). Discard the insulators, bushings, or washers if defective.
(g) Insert the new field coil (61) into the field frame (64) using new field coil insulators (56), insulator
plates (60), terminal bushings (55), and field terminal washer (54).
NOTE
If the pole rotor shoes (58) have a long lip on one side, the lip must face in the direction of
armature rotation when viewed from the drive end). This locates the lip as the trailing edge of
the pole rotor shoe.
(h) Insert the pole rotor shoes (58) into position in the field coils, and retain with the pole shoe screws
(57). Do not tighten the screws at this time.
(i)
Check to be sure that the insulators (56 and 60) are properly placed, and the pole rotor shoes are not
pinching the field coils (61). Tighten the pole shoe screws (57) using an ordinary screwdriver.
(j)
Place a pole shoe spreader between opposite pole rotor shoes (58), and tighten it in place.
(k) Using a pole shoe screwdriver and an arbor press, tighten the pole shoe screws (57) in accordance
with Table 1-2, and remove the pole shoe spreader.
(I)
Repeat steps 0) and (10, above, for the other two pole shoes.
(m) Be sure the terminal bushings (55) and field terminal washer (54) are property positioned on the stud,
and install another field terminal washer (54), flat washer (40), and hexagonal nut (38) on the
terminal stud.
(n) To make sure that the field coils (61) have been installed properly and were not damaged during
installation, check for grounds and opens in accordance with steps (15) and (16), above.
(o) Install the terminal lug (53) and hexagonal nut (37) on the terminal stud. Do not tighten the nut at
this time.
(40)
Replace a defective electrical holder assembly (51) and insulators as follows:
(a)
Remove the hexagonal nut (38), lockwasher (39), flat washer (40), terminal stud bushing (41), and
insulator washer (42).
(b) Remove the bush plate screws (49), and remove the electrical holder assembly (51), brush plate
insulator (46), and insulator washer (42). Discard the insulators if defective.
(c) Install the brush plate insulator (46) and insulator washer (42) on the electrical holder assembly (51),
and insert the stud through the hole in the starter housing (43).
(d) Install the insulator washer (42), terminal stud bushing (41), flat washer (40), lockwasher (39), and
hexagonal nut (38). Do not fully tighten the nut at this time.
(e) Install the brush plates screws (49), and tighten them in accordance with Table 1-2.
(f)
Tighten the hexagonal nut (38, Figure 4-3) to 20 to 25 pound-feet (27 to 34 newton-meters).
4-14
