BOGIES AND SUSPENSION - South Central Railway

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CHAPTER 6 – BOGIES AND SUSPENSION B. FOUR WHEELER SUSPENSION WAGON MAINTENANCE MANUAL Page 50 of 121 In four wheeler wagons the load is transmitted in the conventional arrangement via the sole bar, scroll iron, shackles or shackle plates to the springs and axle box, axle box key plates and bearing journal. SCROLL IRON L.H. SHACKLE PLATE PIN COTTERED AXLE GUARD L.H. AXLE GUARD HORN CHEEK L.H. AXLE BOX FACE PLATE AXLE BOX FIG. 6.4 : SUSPENSION ARRANGEMENT OF 4-WHEELER WAGON The individual elements of four wheeler suspension are listed below: Sr. No. Name of the part No. per assembly a) Scroll Iron One RH & One LH b) Shackle pins 4 c) Shackle plates 4 d) Bearing Spring 1 e) Shackle pin Washers 4 f) Split Cotters/bulb cotters 4 a) SCROLL IRON AXLE GUARD PACKING COTTER SPLIT The Scroll iron is forged out of class II steel to IS-1875. It is secured to the bottom flange of the sole bar by means of 3 rivets. The following defect may arise in scroll irons in service:- (i) Rivets loose, deficient or broken (ii) Scroll iron cracked or broken (iii) Scroll iron shifted out of alignment (iv) Eye hole worn over size or oval SCROLL IRON R.H. BEARING SPRING AXLE GUARD TIE (BRIDLE BAR) AXLE GUARD R.H. AXLE GUARD HORN CHEEEK R.H.
CHAPTER 6 – BOGIES AND SUSPENSION WAGON MAINTENANCE MANUAL Page 51 of 121 Defects mentioned against item (i) to (iv) are rejectable defects. On noticing any of these defects the wagon should be marked sick and sent to sick line for repairs. The wagon should not leave workshops, wagon depots and NPOH depots with these defects. To determine quality, it has to be kept in view that the maximum permissible diametrical clearance between the scroll iron and shackle pin during service is 4 mm and 1.05 mm when new. If clearance more then 4 mm is noticed, the shackle pin should be replaced. Scroll iron should also be replaced.when the eye hole diameter exceeds 1 mm above the upper nominal size(viz 29.65 mm for BG 23.65 mm for MG). The scroll iron may be repaired by electric welding & normalising in the workshop. The workshop code and date of welding must be stamped on the upper surface of the scroll iron close to the weld. b) SHACKLE PIN 100% Shackle pin is made of steel class III. In view of the large scale breakage of shackle pins on M.G. stock, RDSO vide their letter No. MW/SNG/W dated 1.1.1976/10-3-76 have recommended the use of class IV M-4 steel instead of class III M-4 steel for MG only. Shackle pin is manufactured out of bars by forging process followed by normalising. Since Jan.’73, stamping on the top of the pin head of IRS part No., manufacture’s initial, manufacturing month and year in 3 mm type has been introduced. Since December 1975, stamping as class IV on shackle pins manufactured out of class IV steel for M.G only has also been introduced Scroll iron and spring eyes are connected through shackle plates provided on either end of the eyes. One shackle pin connects the shackle plates with scroll iron and another shackle pin connects it with spring eye. Shackle pin is a highly stressed part and its breakage and failure are very common. It should receive top most attention in workshops and in open lines. The following defects may arise or get noticed in service:- worn out in dia beyond permissible limits broken/cracked bent deficient or of wrong size having excessive lateral clearance in its assembly manufactured out of sub standard material When new, diametrical clearance between the scroll iron and shackle pin, shackle plate and shackle pin should not exceed 1.05mm and between the spring eye and shackle pin should not exceed 1.15 mm. The maximum diametrical clearance permissible for the above is 4 mm. The lateral clearance when new should not exceed 1.5 mm and the maximum possible is 6 mm.
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BOGIES AND SUSPENSION - South Central Railway

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