BOGIES AND SUSPENSION - South Central Railway

CHAPTER 6 – BOGIES AND SUSPENSION
WAGON MAINTENANCE MANUAL
Page 23 of 121
The head of the bolt fits between the bottom lugs of the bogie centre
pivot retaining ring. The head rests on the metallic surface of the composite
washer. It then passes through the hole of the washer, retaining and the bogie
centre pivot bottom. The washer and the castle nut is fitted below the bottom
surface of the boss of the bogie centre pivot bottom. A clearance of 2 mm is
maintained between the bottom surface of the boss and the washer.
The flat surface of the bolt head fitting between the bottom lug of the
centre pivot retainer ring prevents it from retaining. As the nut is fitted at a
place, difficult to access, the bogie should be run out by opening the four bolts
of the bogie centre pivot and lifting the body by about 150 mm.
VII. DUST SHIELD FOR BOGIE CENTRE PIVOT
It is made of mild steel sheet. The plate is of 2 mm thickness. It is bent
like a circular ring having inclined surface. The height of the ring is 50 mm.
The outer dia. at top and bottom are 385 mm and 405 mm respectively. The
ring is large enough to cover the important surface of the centre pivot
assembly and surface is welded around to the bottom surface of the square its
top flange of the bogie centre pivot top, just inside the bolt heads. It protects
the centre pivot assembly from dust and dirt.
i) SIDE BEARERS
The two bogie side bearers are fitted at a distance of 1940 mm, i.e. 970
mm from the centre of the bogie. The bogie side bearer is welded along its
length of top plate on the bolster 12 mm thick. At this location, the bolster
plate has been strengthened from below. The top side-bearer is secured with
the under frame plate by two nos. of M-20 CSK bolts. Below the nut a spring
washer is provided and the nut is secured by 6.3 dia, 32 mm long split pin. At
this location, the under frame plate has also been suitably strengthened from
above.
j) BOGIE SIDE BEARER
It is a rectangular plate of size 300 x90x20 mm. At the bottom, it is
flat and on top it has a radius of 1 metre long its length. In the centre, the
bottom surface has a recess of 40 dia. x 9 mm. The thickness at the sides is 9
mm and at the centre is 20 mm. On the covered surface, 2 rectangular
recesses of size 40 x 100 mm have been provided at both ends. Towards the
centre end the recess has been curved to a semicircle of 40 mm dia. The
thickness of the plate at the recessed portion is 9 mm. The bottom surface of
the side bearer is rough machined and the curved surface rough ground.