TM 55-2210-224-34
3-23. CRANKING CONTACTOR (cont)
ADJUSTMENT (cont)
33. Measure tip break as follows:
NOTE
Check that the contactor armature is against the stop when making the
measurement; otherwise, the reading will be false.
a.
Measure the tip break (air gap) at the point of minimum spacing when tips are open.
b.
Tip break shall be 14/32 to 19/32 inch (11.11 to 15.08 mm) for worn contactor and 15/32 to 18/32 inch (11.09
to 14.28 mm) for new contactor.
c.
If the tip break is not correct, check for the following conditions:
(1)
Worn or bent contact tips
(2)
Bent armature stop
(3)
Worn or bent contact lever
d. Adjust gap by bending the armature st
op.
34. Measure tip alinement and adjust as follows:
NOTE
The maximum allowable side-to-side misalinement of the contact tip is
3/32 inch (2.38 mm).
a.
Check tip for misalinement. If necessary, loosen the screws holding the magnet frame and stationary contact-
tip support to the block and move the assembly until tips aline properly.
b. If tip misalinement cannot be corrected, check for the following conditions:
(1)
Grooving or uneven wear of the armature stop
(2)
Rounded knife edge or unevenwear of the armature pivot point
(3)
Grooving or uneven wear of the armature guide
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