TM 55-2210-224-34
3-26. GROUND RELAY (Cont)
ASSEMBLY (cont)
26. Position interlock frame (54) and install t
wo lockwashers (53) and capscrews (52).
27. Hook calibrating spring (51) on armature (84) and tighten calibrating screw (50) and calibrating screw locknut
(49).
28. Position movable contact finger (48) and install spring (47) and retainer (46). Position normally closed contact
(45) and normally open contact (44), and install flat washers (43) and (42), lockwashers (41) and (40), and nuts
(39) and (38).
29. Position support blocks (37) and (36), and install flat washer (35), lockwasher (34
), and allen-head screw (33).
Install two flat washers (32), lockwashers (31), and allen-head screws (30).
30. Position contact (28) on base (29) and install two flat washers (27), lockwashers (26), and capscrews (25).
31. Position magnet frame (24), operating coil (23), and magnet core (22) on base (29) and install lockwasher (21),
screw (20), two flat washers (19), lockwashers (18), and screws (17). Install flat washer (16), lockwasher (15),
and nut (14).
32. Position rear cover (13) o
n base (29) and install three machine screws (12).
33. Position armature (11) and install pin (10) and cotter pin (9). Install spring (8) and two cotter pins (7).
INSTALLATION
34. Position ground relay (6) and install two flat washers (5) and machine screws (4).
35. Install two flat washers (3), lockwashers (2), and capscrews (1).
36. Connect electrical wires in accordance with wiring diagram and remove tags.
TEST
37. Connect a variable dc voltage supply and multimeter to o
perating coil (28). Check that operating coil maximum
pickup current is 0. 255 amp, minimum pickup current is 0. 250 amp, and drop away current is 0. 075 amp.
38. Connect a variable dc voltage supply to unlatching assembly (23). Use a multimeter and check that unlatching
coil maximum pickup voltage is 48 V dc and minimum drop away voltage is 2 to 18 V dc.
3-109
