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 />
f) SPRING PLANK, FIT BOLTS & RIVETS<br />
WAGON MAINTENANCE MANUAL<br />
Page 7 of 121<br />
Spring plank is a member made of solid steel (flanging quality). It<br />
joins two side frames of CASNUB bogie by eight 24 dia rivets and four M24<br />
“fit” bolts to keep bogie frame square.<br />
Spring plank should be examined for defects like loosening of<br />
rivets/cracks/bending, welding failure of spring spigot etc. Whenever, spring<br />
plank is renewed, the leading dimension of the bogie as per Drg no. SK-<br />
69599(W), WD-85054-S/6(22WM), WD-90042-S/1(NLB), WD-92058-<br />
S/7(HS) must be measured. Special care is to be taken regarding the use of fit<br />
bolts as well as quality of riveting. Fitment of spring plank with side frames<br />
should be done on suitable fixture.<br />
g) LOAD BEARING SPRINGS <strong>AND</strong> SNUBBER SPRINGS<br />
The bogies are fitted with two groups of long travel helical spring<br />
nests. The spring details are shown in WD-83069-S/1 (Common for all<br />
versions except CASNUB- 22HS Bogie). The spring details of CASNUB<br />
22HS are shown in WD-92058-S/5.<br />
DAMPING<br />
The suspension is provided with load proportional friction damping<br />
arrangement with the help of manganese steel cast wedge supported on the<br />
snubber springs. The springs are manufactured out of silico Manganese steel,<br />
chrome vanadium, chrome molybdenum.<br />
The matching of load and snubber springs is important. It is<br />
recommended that the springs should be so grouped that the free height<br />
variation in the group is not more than 3 mm. Mixing of new and old springs<br />
should be avoided. The nominal free height and condemning height are given<br />
in Table 6.1.<br />
h) FRICTION SHOE WEDGES<br />
Friction shoe wedges are fitted on snubber springs. Its vertical surface<br />
is with side frame and slope surface is in contact with bolster pocket liners.<br />
A table containing wear limits on vertical surface and slope surface<br />
nominal and recommended is placed at Table 6.1.<br />
i) CENTRE PIVOT ARRANGEMENT<br />
Centre pivot arrangement for CASNUB 22W bogie is as per RDSO<br />
Drg No. W/BE-601 for top centre pivot and W/BE-602 for bottom centre
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