TM 55-1520-240-23-4
5-123.1
INSPECT AND REPAIR BALL SPHERICAL BEARING
(Continued)
5-123.1
1.
Clean oil and grease from surface of bearing (1).
Use naphtha (E245) and clean cloths (E120).
Wear gloves (E186).
2.
Inspect surface of bearing (1) for nicks,
scratches, and minor pitting or corrosion of
coating. Observe the following definitions:
a.
Nick — A surface indentation with a sharp
crease at the bottom. Surface finish is not
broken. Caused by pressure or impact from a
hard object with a sharp edge.
b.
Scratch — A light, narrow mark on the
surface. Surface finish is broken, but not
removed. Caused by a hard, sharp particle
moving across the surface.
c.
Pit — A small irregular cavity where material
is removed from the surface. Usually
caused by corrosion. Pits are usually dark
in appearance.
d.
Corrosion — A broken or pitted surface,
discolored around the edge. Corrosion is
caused by chemical action.
3.
Note extent and location of damage:
NOTE
Limits in this step refer to depth of
damage after rework.
a.
Depth of damage on bearing surface (1) shall
not be more than 0.020 inch.
b.
Damage shall not extend to edge of bearing
surface.
c.
Sum of length plus width of any one damaged
area shall not be more than 1-1/4 inches.
d.
Distance between two damaged areas shall
not be less than half the length of the larger
area.
5-679
