BOGIES AND SUSPENSION - South Central Railway
BOGIES AND SUSPENSION - South Central Railway
BOGIES AND SUSPENSION - South Central Railway
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CHAPTER 6 – <strong>BOGIES</strong> <strong>AND</strong> <strong>SUSPENSION</strong><br />
WAGON MAINTENANCE MANUAL<br />
Page 56 of 121<br />
iii. Uneven bearing of pins on spring eye: this is due to use of worn out<br />
pin and may lead to fatigue crack or sudden fracture.<br />
iv. The gap between any two plates exceeding beyond 0.5mm.<br />
v. Lateral and diametrical clearance exceeding permissible limits. Spring<br />
should normally be replaced when the eye hole dia exceeds 1 mm<br />
above the upper normal size viz. 29.75 for BG and 23.75mm for MG.<br />
vi. Wagons over and unevenly loaded or with shifted loads causing over<br />
stressing of spring and difference of cambers. This may cause failure<br />
of spring and or derailment.<br />
NOTE:<br />
(i) The goods stock is allowed to be over loaded beyond maximum carrying<br />
capacity inclusive of loading tolerance to the extent shown below subject<br />
to conditions laid down in IRCA Rules Pt.III 2000 edition.<br />
Four wheeler wagon Bogie wagon<br />
BG 2 4<br />
MG 1 2<br />
(ii) It has to be carefully noted that the overloading of tank wagons is not<br />
permitted. Also BOX, BOI, BRS, BRH, BCX, BOBX type BG bogie<br />
wagons and nonstandard BG BFRS are not allowed to be over loaded.<br />
i. GRADING OF SPRINGS<br />
Camber of spring plays a important part in the stability of wagons.<br />
Under ideal conditions, the camber of all the four springs used on the wagon<br />
should be equal and they should have the same load deflection characteristics.<br />
However it is not possible to manufacture springs of equal cambers. A<br />
variation of spring camber up to 5 mm and 6 mm for MG and BG respectively<br />
from the nominal size is permissible for new spring. In order to ensure that all<br />
the four springs of the wagons have almost equal camber, the springs are<br />
devided in four groups according to the camber. While fitting springs on<br />
wagons in the workshops and open line, it should be ensured that as far as<br />
possible, all should be of same group or one group higher or lower. The<br />
workshops shall ensure that after manufacture / repair testing and measuring<br />
of camber, the spring should be marked by paint on the buckle as A, B, C and<br />
D, as the case may be.
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