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 51 of 121<br />
Defects mentioned against item (i) to (iv) are rejectable defects. On<br />
noticing any of these defects the wagon should be marked sick and sent to sick<br />
line for repairs. The wagon should not leave workshops, wagon depots and<br />
NPOH depots with these defects. To determine quality, it has to be kept in<br />
view that the maximum permissible diametrical clearance between the scroll<br />
iron and shackle pin during service is 4 mm and 1.05 mm when new. If<br />
clearance more then 4 mm is noticed, the shackle pin should be replaced.<br />
Scroll iron should also be replaced.when the eye hole diameter exceeds 1 mm<br />
above the upper nominal size(viz 29.65 mm for BG 23.65 mm for MG).<br />
The scroll iron may be repaired by electric welding & normalising in<br />
the workshop. The workshop code and date of welding must be stamped on<br />
the upper surface of the scroll iron close to the weld.<br />
b) SHACKLE PIN<br />
100% Shackle pin is made of steel class III. In view of the large scale<br />
breakage of shackle pins on M.G. stock, RDSO vide their letter No.<br />
MW/SNG/W dated 1.1.1976/10-3-76 have recommended the use of class IV<br />
M-4 steel instead of class III M-4 steel for MG only. Shackle pin is<br />
manufactured out of bars by forging process followed by normalising. Since<br />
Jan.’73, stamping on the top of the pin head of IRS part No., manufacture’s<br />
initial, manufacturing month and year in 3 mm type has been introduced.<br />
Since December 1975, stamping as class IV on shackle pins manufactured out<br />
of class IV steel for M.G only has also been introduced Scroll iron and spring<br />
eyes are connected through shackle plates provided on either end of the eyes.<br />
One shackle pin connects the shackle plates with scroll iron and another<br />
shackle pin connects it with spring eye.<br />
Shackle pin is a highly stressed part and its breakage and failure are<br />
very common. It should receive top most attention in workshops and in open<br />
lines. The following defects may arise or get noticed in service:-<br />
worn out in dia beyond permissible limits<br />
broken/cracked<br />
bent<br />
deficient or of wrong size<br />
having excessive lateral clearance in its assembly<br />
manufactured out of sub standard material<br />
When new, diametrical clearance between the scroll iron and shackle<br />
pin, shackle plate and shackle pin should not exceed 1.05mm and between the<br />
spring eye and shackle pin should not exceed 1.15 mm. The maximum<br />
diametrical clearance permissible for the above is 4 mm. The lateral clearance<br />
when new should not exceed 1.5 mm and the maximum possible is 6 mm.
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