BOGIES AND SUSPENSION - South Central Railway

CHAPTER 6 – BOGIES AND SUSPENSION
WAGON MAINTENANCE MANUAL
Page 42 of 121
During service wear takes place on the concave and convex spherical
surface of the bottom and top pivots respectively thus reducing the side bearer
clearances. In service minimum clearance should be ensured otherwise the
transmission of the weight of the body will be through these surfaces which is
not desirable. Also there will be obstruction in turning of trolley relative to the
body. The workshops should turn out wagon at least with a minimum
clearance as prescribed. This will permit sufficient wear up to next POH
corresponding to permissible variation in side bearer clearance. The total wear
on the pivots is not likely to exceed 3 mm in between the two POH of the
wagon. The difference between actual clearance and initial clearance gives the
total wear on the concave and convex surface of the bottom and top pivots.
The wear on concave and convex surface of the pivots is generally
uneven. At the time of POH, these surfaces should be rough ground and their
spherical shapes should be restored as for is possible. For checking the
spherical profile standard gauge should be used. The rivets of top and bottom
pivots should be checked for soundness and renew if required, pivots should
also be checked for breakage and cracks.
e) MAINTENANCE OF BOGIE SIDE BEARER
In service, side bearer clearance increases due to wear of bottom and
top pivots and increases on account of wear on rubbing surfaces of top and
bottom side bearers. To adjust side bearer clearance step size liners of 1 mm
and 3 mm thickness should be used in workshop and sick lines after loosening
the bolts, the liners should be inserted below the bottom side bearers and then
the bolts should be tightened up. Workshops should run out wagon stock with
side bearer clearance of 4 to 5 mm on one side.
There is no necessity to insert liner on topside bearers. If the
adjustment is not possible with insertion of liners, top and or bottom side
bearer should be replaced as the case may be.
While machining both top and bottom side bearer height should be
adjusted to give correct relative height of bogie centre and side bearers within
tolerance provided.
At the time of POH and in the sick lines, 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.
To prevent turning out of nut and consequent loosening of bolts, the
fitting has been modified. A split pin is to be fitted after the nut by making
corresponding holes in the bolt.