Draw and Buffing Gear in Railways
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Questions and Answers

What should be done if the guard arm distortion exceeds 4.8 mm?

  • It should undergo minor adjustments.
  • It should be left as is.
  • It should be replaced immediately.
  • It should be closed into normal. (correct)

    • When checking the knuckle, what should happen at point D when A, B, and C are in contact?

  • D should not be checked.
  • D must touch as well.
  • D must have a visible gap. (correct)
  • D must be bent slightly.

    • If the gauge no. 3 indicates contact at points A and either B or C, what action should be taken?

  • Adjust the guard arm.
  • Renew the coupler body. (correct)
  • Lubricate the coupler.
  • Reset the gauge and recheck.

    • What condition of the knuckle necessitates its renewal?

    <p>If D touches when A, B, and C are in contact.</p> Signup and view all the answers

    During the inspection of knuckle nose wear, what is the indication that requires renewing the knuckle?

    <p>If E passes when F and G are in contact.</p> Signup and view all the answers

    Why is it important for point E not to pass during knuckle nose wear inspection?

    <p>It ensures the knuckle is functioning well.</p> Signup and view all the answers

    What type of gauge is used for checking the guard arm distortion?

    <p>Gauge no. 3</p> Signup and view all the answers

    Which company is listed as a manufacturer of BESCO in the high capacity draft gear section?

    <p>Burn Standard Co. Ltd.</p> Signup and view all the answers

    What is the location of Titagarh Wagon Ltd. according to the provided information?

    <p>113, Park Street, Calcutta-700 016</p> Signup and view all the answers

    Which item is associated with Annpurna Engg. Works based on the content?

    <p>Top Lock Lift Hole Cap</p> Signup and view all the answers

    Which of the following companies is linked to the Miner design type?

    <p>Texmaco Rail and Engineering Ltd.</p> Signup and view all the answers

    Identify the specification that includes the knuckle pin with washer.

    <p>SPEC-48-BD-08</p> Signup and view all the answers

    What is the yield strength of the knuckle in a standard coupler?

    <p>132 tonnes</p> Signup and view all the answers

    How much higher is the draft capacity of a high tensile coupler compared to a standard coupler?

    <p>36%</p> Signup and view all the answers

    Which high capacity draft gear has the highest weight capacity?

    <p>MK-50</p> Signup and view all the answers

    What is the performance efficiency of the RF-361 draft gear?

    <p>79.6%</p> Signup and view all the answers

    What type of draft gears are currently fitted on new freight stocks?

    <p>RF-361, MK-50, and MINER SL-76</p> Signup and view all the answers

    What is the pre-compression force applied to the RF-361 draft gear?

    <p>Rubber pads</p> Signup and view all the answers

    Which of the following is NOT identified as a high capacity draft gear currently in service?

    <p>HR-40-I</p> Signup and view all the answers

    What is the travel capacity of the MK-50 draft gear?

    <p>81.5 mm</p> Signup and view all the answers

    What type of material is used in the RF-361 draft gear assembly?

    <p>Rubber</p> Signup and view all the answers

    What is the maximum allowable wear on any friction surface?

    <p>0.8 mm or 1/32&quot;</p> Signup and view all the answers

    Which defect is NOT permissible on the wedges intended for reuse?

    <p>Indentations deeper than 0.5 mm</p> Signup and view all the answers

    What condition must the inside friction bore walls satisfy?

    <p>Must have a wall thickness of at least 20.6 mm</p> Signup and view all the answers

    Which of the following statements about the housing is true?

    <p>There must be no bottom ridging in the bore.</p> Signup and view all the answers

    What is required for the parts before re-assembly?

    <p>They must be free of oil, grease, and moisture.</p> Signup and view all the answers

    What process is recommended for cleaning wedges and shoes before assembly?

    <p>Shot-peening</p> Signup and view all the answers

    What is indicated about the profile gauges used for housing?

    <p>Gauges No. 27706 and 27200 must be used.</p> Signup and view all the answers

    During assembly, where should the assembly ring be placed?

    <p>Over the housing</p> Signup and view all the answers

    What should be avoided on the wedge and shoe parts?

    <p>Sharp edges</p> Signup and view all the answers

    What does a concavity of more than 0.8 mm in the bore indicate?

    <p>The bore must be replaced.</p> Signup and view all the answers

    What is the maximum allowable parting line flash for rubber pads?

    <p>0.78 mm</p> Signup and view all the answers

    Which of the following is NOT a requirement for rubber pads during static testing?

    <p>Must be skewed after the load is released</p> Signup and view all the answers

    What condition should elastomeric material meet before acceptance?

    <p>It should be free from foreign material</p> Signup and view all the answers

    Which dimension must the outside profile of the internal follower meet as a minimum?

    <p>11.25&quot; x 7&quot;</p> Signup and view all the answers

    During the visual inspection of forged items, which of the following is NOT a common check?

    <p>Identifying color uniformity</p> Signup and view all the answers

    What must the pads exhibit after a load is released during testing?

    <p>Return to minimum free height</p> Signup and view all the answers

    Which of the following is a requirement for the top and bottom surfaces of plates?

    <p>Must be free of elastomer films</p> Signup and view all the answers

    What is the maximum allowable deviation for the base's flatness across the diagonals?

    <p>1/16” (1.6mm)</p> Signup and view all the answers

    Which of the following inspections is required for rubber pads during visual checks?

    <p>Visual inspection of all pads</p> Signup and view all the answers

    What is the minimum depth for inspection sprues below the steel plate surface?

    <p>3.18 mm</p> Signup and view all the answers

    What is indicated when the plate clearance reduces to zero in the draft gear?

    <p>The draft gear will start wearing on the housing.</p> Signup and view all the answers

    What is the recommended press force required to dismantle the Mark-50 draft gear?

    <p>40 tonnes</p> Signup and view all the answers

    Which gauge is used as a No-Go Gauge to check the minimum housing wall thickness?

    <p>Gauge No.BE-92/62-6</p> Signup and view all the answers

    What happens if parts of the draft gear start wearing on the housing?

    <p>Considerable damage occurs, making reconditioning impossible.</p> Signup and view all the answers

    Which type of gauge is used to check the movable plate area?

    <p>Go, No-Go Gauge</p> Signup and view all the answers

    Which of the following components is NOT part of the RF-361 draft gear?

    <p>Clutch housing</p> Signup and view all the answers

    What gauge is used for checking the flatness of the housing in RF-361 draft gear?

    <p>Gauge 27257</p> Signup and view all the answers

    When is complete reconditioning of RF-361 draft gear necessary?

    <p>If there is a cracked weld at the rear wall</p> Signup and view all the answers

    Which gauge is used as a pre-shortened assembled gauge for final inspection?

    <p>Gauge 27207</p> Signup and view all the answers

    What indicates a loose clutch in the RF-361 draft gear?

    <p>Defective rubber springs package</p> Signup and view all the answers

    Which gauge is specifically designed for measuring the wedge in the RF-361 draft gear?

    <p>Gauge 27216</p> Signup and view all the answers

    What is a common indication of poor welding practice in the RF-361 draft gear?

    <p>Fatigue cracks on welds</p> Signup and view all the answers

    What is the weight capacity of the RF-361 high capacity draft gear?

    <p>138.0 kg</p> Signup and view all the answers

    Which draft gear type has the highest performance efficiency?

    <p>MK-50</p> Signup and view all the answers

    What is the yield strength of the knuckle in a high tensile coupler?

    <p>180t</p> Signup and view all the answers

    During which period were bogie wagons manufactured that were originally fitted with HR-40-I draft gears?

    <p>1984-85</p> Signup and view all the answers

    How much higher is the draft capacity of the high tensile coupler compared to the standard coupler in percentage?

    <p>36%</p> Signup and view all the answers

    Which type of draft gear has a travel capacity of 67.8 mm?

    <p>RF-361</p> Signup and view all the answers

    What is the reaction force of the MK-50 draft gear?

    <p>269.0 tonnes</p> Signup and view all the answers

    What action is mandated for standard draft gears in relation to high capacity draft gears?

    <p>They are to be replaced with high capacity draft gears.</p> Signup and view all the answers

    Which is NOT one of the high capacity draft gears currently in service?

    <p>HR-40-I</p> Signup and view all the answers

    What is the minimum wall thickness that the housing must meet at its bottom?

    <p>11.9 mm</p> Signup and view all the answers

    Which method of cutting is mentioned as potentially creating an explosive mixture if not properly ventilated?

    <p>Flame cutting</p> Signup and view all the answers

    What should be the measured thickness of rubber pads according to the gap gauge?

    <p>2 1/8 inches</p> Signup and view all the answers

    What is a permissible condition for steel plates according to the inspection guidelines?

    <p>Bent but not broken or cracked</p> Signup and view all the answers

    What is the maximum force that the hydraulic ram must be capable of resisting?

    <p>10 tons</p> Signup and view all the answers

    During complete reconditioning, what should be done with the wedges and shoes?

    <p>They must be removed</p> Signup and view all the answers

    What is the maximum thickness cut required when cutting the rear wall plate?

    <p>1 1/4 inches</p> Signup and view all the answers

    What should be done if the rubber pads show large material chunks?

    <p>They must be rejected</p> Signup and view all the answers

    What happens to the internal spring force when the wedge is cleared from the housing lug?

    <p>It is released</p> Signup and view all the answers

    What must be locked about ¼ inch longer than the housing length to facilitate rear plate separation?

    <p>The hydraulic ram</p> Signup and view all the answers

    What is the purpose of pre-shortening the RF-361 draft gear?

    <p>To facilitate installation into the yoke and draft pocket</p> Signup and view all the answers

    What is the maximum internal spring force for a normally released Mark 50 draft gear?

    <p>10,000 kg</p> Signup and view all the answers

    When inspecting draft gear at the ROH depot, what appears in a normally released condition?

    <p>The housing is against the rear lugs</p> Signup and view all the answers

    What must be done to the draft gear approximately during its removal from the wagon pocket?

    <p>Compress it by 6.35 mm (1/4')</p> Signup and view all the answers

    What is the required action for the external surfaces of the draft gear after pre-shortening?

    <p>They are to be painted with black or blue paint</p> Signup and view all the answers

    What might indicate a normal fully released draft gear even if a slight gap is present?

    <p>An enlarged draft gear pocket is present</p> Signup and view all the answers

    Which tool is used to check the pre-shortened length of the RF-361 draft gear?

    <p>Gauge 27207</p> Signup and view all the answers

    What is the initial condition of a draft gear when installed into a wagon pocket?

    <p>It has ample initial spring load for a tight fit</p> Signup and view all the answers

    Which option is correct regarding the operation of the pre-shortening block?

    <p>It applies a load to compress the gear</p> Signup and view all the answers

    In terms of maintenance protocols, what is a critical aspect when inspecting draft gear condition?

    <p>Determine if the draft gear is in a normal released or stuck condition</p> Signup and view all the answers

    Study Notes

    Draw and Buffing Gear

    • Two main arrangements used on Broad Gauge wagons:
      • Older arrangement: screw coupling with side buffers
      • Conventional arrangement: Centre Buffer Coupler (CBC) transmitting draft and buffing loads
    • Older arrangement uses screw coupling, draw hook, and draw hook springs for draft load, and side buffers for buffing force
    • Conventional screw coupling (WA/BD-125) working load: 22.5 tonnes
    • Centre Buffer Coupler (CBC) adopted for BOX, BOXN and other new design wagons, higher capacity than older design
    • Knuckle type CBCs have working strength of 120 tonnes
    • Alliance-II coupler working strength: 54 tonnes
    • CBC has a transition version, with screw coupling and side buffers, allowing coupling with screw-coupled wagons
    • Conventional draw and buffing gear is phased out, details not included in this manual
    • Current use focuses on high-capacity CBC and draft gear (2002 manual for maintenance)
    • Indian Railways uses AAR type centre buffer couplers (E-type head, F-type shank) on BG freight stock.
    • AAR coupler draft capacity depends on knuckle strength (weakest link)
    • Material AAR M-201 Grade C and E yield strengths: 132t and 180t, respectively
    • Advantages of AAR Centre Buffer Coupler:
      • Coupler and buffing gear located at center of wagon
      • Identical at both ends, wagon direction immaterial
      • Automatic coupling action
      • Possible coupling with screw coupling via transition arrangement

    Parts of Centre Buffer Coupler Assembly

    • Coupler body, Knuckle, Knuckle pivot pin, Lock, Knuckle thrower, Toggle, Universal lock lift lever connector, Lock lift lever hook, Lock lift rivet, etc.
    • Parts of non-transition coupler interchangeable with transition type coupler, except for striker casting/wear plate and coupler body/shank (longer in transition version).

    Inspection of CBC

    • Coupler and operating mechanism inspection:
      • Check coupler operation through complete cycle (knuckle throw, lock set, lock-to-lock, locking)
      • Check for shank bending
      • Check shank wear plates, and replace if worn through
      • Check shank wear (if no wear plates), and weld if wear approaches 6.5mm
      • Inspect operating mechanism for free movement of parts
    • Inspect coupler head and fittings for cracks/damage. Use dry lubricants (water, alcohol, non-petroleum based carrier)
    • Only lubricate exposed surfaces of coupler and yoke.

    Inspection of Draft Gears

    • Excessive slack in draft gears not permissible (25mm maximum)

    Removal of Coupler and Draft Gear

    • Method for removing coupler and draft gear from wagons varies based on whether its loose in pocket or tight
    • Use conventional methods to remove parts like the yoke pin support plate and yoke pin

    CBC Measuring Gauges and Their Applications

    • Gauges used for checking wear in guard arm, knuckle (face of CBC) for various issues.
    • Check guard arm expansion; renew knuckle components or lock if gauge passed
    • Check guard arm distortion; renew coupler body if gauge doesn't fit
    • Check stretched/worn knuckle; renew knuckle if gauge touches other parts
    • Check knuckle nose wear; renew knuckle if wear exceeds limit
    • Check knuckle lock-face wear; renew knuckle if gauge passes
    • Inspect anti-creep edge of bottom lifter; If gap, replace bottom lifter
    • Inspect anti-creep lug of rotary lever; renew rotary lever if gauge not properly fitting

    High Tensile Coupler and High Capacity Draft Gear

    • Replaced grade C type coupler with grade E (high tensile) to reduce maintenance for heavy haul freight trains
    • A comparison of materials and strengths for grade C and E couplers is provided
    • Standard and high tensile CBCs are identical in dimension but high tensile couplers have higher capacity
    • Improved high-capacity draft gears (MK-50, RF-361, Miner SL-76) for increased capacity
    • Different models for freight and locomotive use

    RF-361 Draft Gear

    • Fully enclosed, self-contained unit with pre-compressed rubber pads

    List of Gauges for RF-361 Draft Gear

    • Providing a list of gauges for checking

    Maintenance

    • Different inspection points and procedures for the various parts.
    • Complete reconditioning if required, including replacing rear wall plates if necessary or clutch components (shoes & wedges), or cracked weldings (of housing)

    Dismantling Procedure

    • Procedures for removing components from draft gears (including shoes, wedges, and other related components)
    • Inspection of different parts (shoes, wedges, housing) procedures for various conditions

    Welding of Rear Plate

    • Procedures for welding the rear wall plate to the draft gear housing

    Static Test

    • Inspection of rubber pads, visual verification of parts for damage.

    Removal of Stuck Draft Gear

    • Steps to remove stuck draft gears, suitable methods for loosening draft gears from wagon pockets/handles
    • Important step by step procedures

    Summary of Action Plan

    • Actions to reduce train partings, including inspection, improvement, and replacement of components (especially knuckles, locks, and operating handles) and improving maintenance standards for CBC and draft gear are outlined.

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    Related Documents

    CnW Maintenance Manual PDF

    Description

    This quiz covers the arrangements of draw and buffing gear used in Broad Gauge wagons, focusing on the transition from older screw coupling methods to the modern Centre Buffer Coupler (CBC). It highlights the specifications and working strengths of different coupling types and emphasizes the current practices in Indian Railways. Test your knowledge on these essential components of railway engineering!

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