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Roller bearing axle wear limits.
Figure A-18. Roller bearing age.
Table A-3. Roller bearing axle wear limits.
REJECT WHEN LESS THAN
Journal Size
Wheel Seat
Wheel Seat
Standard
Black Collar
Raised
Axle Center
A
B
G
4 x 8"
5
"
6 1/16"
4 11/16"
5 x 9"
6 1/4"
6
"
5
"
5 x 10"
6
"
7 3/16"
5
"
6 x 11"
7 3/8"
7 7/8"
6 5/16"
6 x 12"
7 7/8"
8 3/8"
6
"
7 x 12"
........
9 "
7 7/8"
6.
Defective rail car truck.
a. A rail car truck shall be repaired before placing or continuing in service if a side frame
has any of the following defects:
(1) A side frame or bolster that is broken or has a crack of inch or more in the
transverse direction on a tension member, is bent, is patched, or is the wrong size.
(2) A side frame is worn or corroded more than 25% in any section of the side frame,
except brake hanger bracket, journal box or column guide on which any section should not be
reduced below 40% of the original section. See Table A-4 for wear limits.
A - 19


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