BOGIES AND SUSPENSION - South Central Railway

CHAPTER 6 – BOGIES AND SUSPENSION
605 F. IMPORTANT Do’s & Don’ts DURING REPAIR OF SPRINGS
Do
WAGON MAINTENANCE MANUAL
Page 61 of 121
i. Ensure a minimum gap of 2 mm between the rolled end and upper surface
of the two plates. .
ii. Ensure that the eye holes are laterally parallel within the specified
dimension, smooth and free from burrs and are not bell-mouth.
iii. Ensure that stamping and punching is done on spring buckle only and not
on plates.
iv. Ensure correct diametrical and lateral clearances in shackle assembly as
explained above.
v. Ensure proper seating of bearing spring buckle in axle box housing or
crown packing where fitted.
vi. All plates shall be so fitted that a 0.5 mm feeler should not enter the gap
between the plates.
Don’t
i. cold hammer plates and buckle: this results in indentations which are
potential stress raisers.
ii. rough handle, springs.
iii. allow a spring in service with biting mark at the rolled eye.
iv. permit a wagon to be in service with sole bars resting on bearing spring
buckles.
v. allow a spring in service with plate or buckle displaced from its central
position by 13 mm or more.
vi. allow wagon to run, which are unevenly loaded/over-loaded or have
shifted loads as explained above.
vii. allow a difference in excess of 13 mm in working camber between any two
springs on a loaded wagon.
viii. allow springs in service with cracked or broken plate/plates.
605 G. AXLE BOX CROWN PACKING PLATE (SPRING SEAT)
It is made of steel 42-S to IS:226. It is used for raising the buffer height of
wagons lost due to reduced wheel dia. It also makes good the height lost due to
reduced brass thickness loss in camber of springs and reduced journal dia. It is placed
on the top of the axle box crown. The spring buckle rests over it. The shape of
packing plate is made to suit the shape of axle box crown and the spring buckle.
Depending upon the height of the buffer to be raised, different step sizes of plates are
used. On BG stock, the step sizes of plates raise the height by 11, 26, 37 mm as per
IR part Drg. No. W/SN 1460, 1616 & combination of 1460 & 1616 respectively. On
MG stock, step-size spring seats raise the height by 9, 19, 6 & 35 mm as per Drg.
Nos. W/SM-1462, 1461, 1421 and combination of W/SN-1462 and 1421 respectively.