BOGIES AND SUSPENSION - South Central Railway
BOGIES AND SUSPENSION - South Central Railway
BOGIES AND SUSPENSION - South Central Railway
Create successful ePaper yourself
Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.
CHAPTER 6 – <strong>BOGIES</strong> <strong>AND</strong> <strong>SUSPENSION</strong><br />
WAGON MAINTENANCE MANUAL<br />
Page 8 of 121<br />
pivot for separate cast bottom pivot. For CASNUB bogies other than<br />
CASNUB 22W, centre pivot bottom and centre pivot top are as per RDSO Drg<br />
No. WD-85079-S/2.<br />
Centre pivot pin for CASNUB 22W bogie is a headless pin while for<br />
other versions, a special type of pin is provided with castle nut/shackle lock<br />
for locking.<br />
To determine the seat wear, the gauge should be placed in position. If<br />
the pivot surface starts touching the surface on the gauge at any point, repair<br />
to be made by welding. The gauge should be moved on the complete worn<br />
surface to be measured. The surface after reclamation shall be the original<br />
dimension as per the respective drawings for proper matching of surfaces with<br />
top centre pivot.<br />
The repairs should be carried out if a 9 mm thick shim in CASNUB<br />
22W bogie (7 mm thick for other bogies) can be inserted for the full depth<br />
between the worn surface and the gauge at any point on the vertical wall of the<br />
bowl with gauge in position.<br />
During POH/ROH the wear on the vertical side of the bowl, seat of the<br />
bowl should be built up by welding. Preheat the surface to be reclaimed up to<br />
a maximum temperature of 250 0 Celsius. After welding, it should be allowed<br />
to cool slowly by covering the welded portion with asbestos/sand.<br />
j) SIDE BEARER<br />
CASUNB 22W Bogies are fitted with roller type side bearers, which<br />
are free to move in cast steel housing, riveted on the bogie bolster. CASNUB<br />
22W(Retrofitted), CASNUB 22W(M), 22NL, 22NLB Bogies are fitted with<br />
constant contact type of side bearer rubber pads located in cast steel housing<br />
which is riveted to the bogie bolster. CASNUB 22HS Bogies are fitted with<br />
helical spring loaded constant contact type side bearer, riveted/bolted on the<br />
bogie bolster.<br />
k) ELASTOMERIC PAD<br />
Elastomeric pads are provided in all versions of CASNUB bogie<br />
except CASNUB 22W. The main purpose of providing elastomeric pad is to<br />
reduce wheel flange wear.<br />
Elastomeric pads to 95005-S/4, Wd-92058-S/8 (for HS) & WD-95005-<br />
S-1 and side bearer rubber pads to WD-85076-S/1 shall be condemned and<br />
replaced by new ones on the following grounds :-<br />
i. If the top of the bottom plates or intermediate plate in case of side<br />
bearer pads show any crack in service.
Change language