BOGIES AND SUSPENSION - South Central Railway

CHAPTER 6 – BOGIES AND SUSPENSION
f. MAINTENANCE OF SPRING PLATE
WAGON MAINTENANCE MANUAL
Page 43 of 121
It has to be noted carefully that four rivets are countersunk on the outer
side so that it properly rests upon the spring plank and floating bolster. It is
important that four holes meant for riveting the washer and the nibbed portion
are kept at correct distances else there would be difficulty in assembling the
coil springs.
During POH, it has to be ensured that the plate is not excessively
corroded, the rivets are not loose and the nibbed portion is maintaining its
correct shape. In case of excessive corrosion, the spring plank may be
replaced. If the rivets are loose, these should be renewed. If the nibbed portion
is not maintaining correct shape, it should be restored to correct shape.
g. MAINTENANCE OF COIL SPRING
It is recommended that springs having less than 3 mm free height
variation should be assembled in the same group. Mixing of new and old
spring must be avoided. If any spring is found broken or cracked, it should be
replaced. The condemning dimensions of inner and outer springs are given
below;
Gauge Free Height Condemning Height
MG 252 246
BG 225 219
603 D. REPAIR AND MAINTENANCE IN SICK LINE
i. Side frame should be examined for cracks, distortion and excessive pitting etc.
ii. The side bearer bolts should also be checked against slackness breakage etc.
and should be renewed if found with these defects.
iii. To adjust side bearer clearance step size liners of 3 mm thickness should be
used in sick lines after loosening the bolts. The liners should be inserted below
the bottom side bearers and then the bolts should be tightened up.
iv. Care should be exercised to fill side bearers pockets with soaked cotton waste
and sufficient oil to ensure adequate lubrication during service. Also bolts
should be checked for slackness and breakage