Bogie & Under Gears Overview
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Questions and Answers

What is the function of the bogie pin in the bogie frame?

  • To transmit tractive or brake force (correct)
  • To support the weight of the coach body
  • To reduce friction between axles
  • To stabilize the vehicle during turns

What type of brakes are mentioned as part of the bogie system?

  • Disc brakes
  • Tread brakes (correct)
  • Drum brakes
  • Hydraulic brakes

What is used for primary suspension in the bogie system?

  • Air bags
  • Hydraulic cylinders
  • Helical springs (correct)
  • Solid rubber mounts

Which components are responsible for damping the air springs at the ends of the bolster?

<p>Shock absorbers (C)</p> Signup and view all the answers

What construction method is used for the bogies of motor coaches and trailer coaches?

<p>All welded, light weight construction (D)</p> Signup and view all the answers

How far apart are the side bearers located in the trailer coaches?

<p>1700 mm (C)</p> Signup and view all the answers

What provides support for the coach body in the bogie system?

<p>Side bearers (B)</p> Signup and view all the answers

What is the primary function of hydraulic shock absorbers in the bogie bolster arrangement?

<p>To work in parallel with bolster springs and absorb shock (B)</p> Signup and view all the answers

What should be done if the clearance between the nylon rubbing plate and the steel rubbing plate exceeds 3mm during service?

<p>Address it to prevent excessive longitudinal oscillations (D)</p> Signup and view all the answers

What maintenance is required for equalising stays during a periodic overhaul?

<p>The pins should be removed, cleaned, and oiled (A)</p> Signup and view all the answers

What is the consequence of using a damaged hydraulic shock absorber?

<p>It may lead to increased wear on the bolster springs (C)</p> Signup and view all the answers

What is the significance of providing washers and split pins on the assembly of equalising stays?

<p>To ensure that the pins do not fall out during service (C)</p> Signup and view all the answers

What function does the center pivot of the bogie serve?

<p>Acts as a center of rotation (B)</p> Signup and view all the answers

How are the floating bolsters secured in the TC bogie?

<p>By means of two anchor links (D)</p> Signup and view all the answers

What type of design is used for the wheels of the EMU coaches?

<p>Composite design with rolled steel wheel centers (A)</p> Signup and view all the answers

Which sketch provides the new/re-turned tyre profile requirements?

<p>ROSO Sketch No. 91146 atl. 2 (B)</p> Signup and view all the answers

What is the condemning limit for the wheel diameter of the MC bogie?

<p>877mm (D)</p> Signup and view all the answers

What additional feature secures the tyres on MC/HCC bogies compared to TC bogies?

<p>Additional locking keys (A)</p> Signup and view all the answers

Which of the following statements about wheel gauge is true?

<p>Wheel gauge should be within +2/-1 mm tolerance. (C)</p> Signup and view all the answers

Which measure is NOT accounted for in the tyre condemning limits?

<p>New tyre installation (B)</p> Signup and view all the answers

Which of the following best describes the function of rubbing plates in MC & HCC bogies?

<p>Transfer braking forces (A)</p> Signup and view all the answers

What should be checked when examining bolts for re-use?

<p>Worn threads and straightness (A)</p> Signup and view all the answers

What material is used to manufacture axle box springs?

<p>Centrefless ground chrome vanadium steel (D)</p> Signup and view all the answers

What is necessary to check for in axle box springs to ensure they are suitable for use?

<p>Cracks and free height (D)</p> Signup and view all the answers

What happens if the lower spring seat is scored or damaged?

<p>It should be reclaimed if worn more than 0.4 mm (B)</p> Signup and view all the answers

What component is used for close guidance of the wheel set in the axle box assembly?

<p>Acetal/bronze bush (C)</p> Signup and view all the answers

What is the primary function of the rubber ring in the axle guide assemblies?

<p>To seal the assembly and make it oil tight (D)</p> Signup and view all the answers

What happens to the lower spring seat if the oil quantity in the dashpot is inadequate?

<p>It is likely to wear (A)</p> Signup and view all the answers

How are the axle box guides described in terms of construction?

<p>Accurately machined hollow forgings welded to the bogie frame (B)</p> Signup and view all the answers

What is the role of the bolster in the suspension system?

<p>It rests on air springs to support load (A)</p> Signup and view all the answers

What is one method of maintaining the damping fluid level in the dashpot?

<p>Having holes on the bogie side frame for topping up (D)</p> Signup and view all the answers

What is the permissible variation in tread diameter for wheels of the same axle?

<p>0.5mm (B)</p> Signup and view all the answers

What is the permissible diameter variation between two bogies under the same coach?

<p>13.0mm (A)</p> Signup and view all the answers

What material specification is applicable for tyres?

<p>IRS Specification R-15/95 (B)</p> Signup and view all the answers

What type of bearings are fitted in MC & HCC bogies?

<p>Double row, self-aligning roller bearings No. 22328 C/C3 (A)</p> Signup and view all the answers

What maintenance procedure should be performed on axle boxes?

<p>Thoroughly clean and check for cracks, particularly at cover holes. (A)</p> Signup and view all the answers

Which specification is applicable to axles for TC bogies?

<p>IRS Specification R-16/95 (B)</p> Signup and view all the answers

What is the main purpose of specifying permissible variations in wheel tread diameter?

<p>To allow for differential wear between tyre turnings/wheel changes. (B)</p> Signup and view all the answers

What additional feature do axle boxes have for maintenance?

<p>Light alloy front and back covers secured by four bolts. (A)</p> Signup and view all the answers

Which specification applies to axles for MC & HCC bogies?

<p>IRS Specification R-43/92 (D)</p> Signup and view all the answers

What type of roller bearings are found in TC bogies?

<p>Self-aligning spherical roller bearings No. 22326 C/C3 (B)</p> Signup and view all the answers

What is the method of construction used for the bogies of motor coaches, high carrying capacity coaches, and trailer coaches?

<p>Welded construction (C)</p> Signup and view all the answers

Which component is responsible for providing primary suspension in the bogie system?

<p>Helical springs (C)</p> Signup and view all the answers

How are the side bearers described in terms of their protection from the environment?

<p>Immersed in oil baths (C)</p> Signup and view all the answers

What spacing is maintained between the side bearers in motor coaches and high carrying capacity coaches?

<p>1200 mm (A)</p> Signup and view all the answers

What type of shock absorbers are used for damping the air springs in the bogie system?

<p>Hydraulic shock absorbers (C)</p> Signup and view all the answers

What is the distance maintained between the side bearers in trailer coaches?

<p>1700 mm (A)</p> Signup and view all the answers

What type of bearings are mounted inside the axle boxes of the bogies?

<p>Self-aligning roller bearings (D)</p> Signup and view all the answers

What is the primary function of the side bearers in the bogie system?

<p>To absorb vertical loads and provide lateral stability (D)</p> Signup and view all the answers

At what wear measurement should the hard ground plate of the side bearers be renewed?

<p>1.5 mm (A)</p> Signup and view all the answers

Which of the following oils can be used for the side bearers?

<p>Any appropriate oil (D)</p> Signup and view all the answers

What problem is likely to occur if sharp edges develop at the periphery of the bronze wearing pieces in side bearers?

<p>Impairment of lubrication (D)</p> Signup and view all the answers

How is the centre pivot of the trailer coach designed in terms of load transmission?

<p>It transmits only tractive and braking forces (C)</p> Signup and view all the answers

What is the main purpose of the nylon rubbing plate in the bogie system?

<p>To provide cushioning between bolster and bogie frame (B)</p> Signup and view all the answers

What should be done when the vertical and horizontal shock absorbers begin to leak?

<p>Replace the shock absorbers (D)</p> Signup and view all the answers

What is the consequence of not maintaining the initial clearance of 1mm on each side of the nylon rubbing plate during maintenance?

<p>Increased risk of excessive longitudinal oscillations (B)</p> Signup and view all the answers

What is necessary to ensure the free movement of equalising stay pins during maintenance?

<p>Grease the assembly after pin removal (B)</p> Signup and view all the answers

When should the maintenance of hydraulic shock absorbers be performed according to the provided guidelines?

<p>As per the manufacturer's maintenance manual (A)</p> Signup and view all the answers

What is the function of equalising stays in the bogie system?

<p>To prevent lateral thrust on bolster springs (D)</p> Signup and view all the answers

What aspect of hydraulic shock absorbers is likely to deteriorate over time?

<p>The resistance of the shock absorber (A)</p> Signup and view all the answers

What should not exceed 3mm during service as per maintenance guidelines?

<p>The clearance on each side of the nylon rubbing plate (C)</p> Signup and view all the answers

What component should be included with the equalising stays to prevent pin loss during service?

<p>Washers and split pins (B)</p> Signup and view all the answers

Which statement is true regarding the maintenance of the nylon rubbing plate?

<p>Steel packings of suitable thickness must be fitted during POH (C)</p> Signup and view all the answers

What is the maximum allowable wheel diameter for the MC bogie?

<p>885mm (C)</p> Signup and view all the answers

Which component is responsible for transmitting draw and braking forces in the TC bogie’s floating bolster?

<p>Anchor links (C)</p> Signup and view all the answers

What design feature is utilized to secure tyres in MC and HCC bogies that is not present in TC bogies?

<p>Locking keys (D)</p> Signup and view all the answers

Beyond the bogie pivot’s function as a center of rotation, what specific role does it play in the system?

<p>It transmits acceleration and retardation forces. (B)</p> Signup and view all the answers

What is the permissible tolerance for wheel gauge adjustment?

<p>+2/-1 mm (C)</p> Signup and view all the answers

What specific tyre profile requirements should be followed for new or re-turned tyres?

<p>As per standard sketch 91146 at all times. (C)</p> Signup and view all the answers

Which wear condition is NOT included in the condemning limits for wheels?

<p>Surface roughness wear (B)</p> Signup and view all the answers

What is the minimum condemning limit for flange wear on MC bogies?

<p>877mm (D)</p> Signup and view all the answers

Which axle design is specified for TC bogies?

<p>Composite axle (B)</p> Signup and view all the answers

What is the permissible variation in tread diameter for wheels between two bogies under the same coach?

<p>13.0 mm (D)</p> Signup and view all the answers

What material specification corresponds to the axles used in TC bogies?

<p>IRS Specification R-16/95 (D)</p> Signup and view all the answers

Which type of roller bearings are used in TC bogies?

<p>Double row, self-aligning spherical bearings No. 22326 C/C3 (A)</p> Signup and view all the answers

What is a key maintenance practice required for axle boxes?

<p>Thoroughly clean and check for cracks (D)</p> Signup and view all the answers

For which bogie type is IRS Specification R-43/92 applicable?

<p>HCC bogies (B)</p> Signup and view all the answers

What is the primary function of the roller bearings installed in MC & HCC bogies?

<p>To allow rotating parts to operate smoothly (A)</p> Signup and view all the answers

How much variation in diameter is permissible for the wheels of the same axle?

<p>0.5 mm (C)</p> Signup and view all the answers

Which part of the axle box housing is specifically mentioned for special attention during maintenance?

<p>Holes of the covers (A)</p> Signup and view all the answers

What kind of bearings are designed as 'self-aligning' in the described bogies?

<p>Double row roller bearings (C)</p> Signup and view all the answers

What is the maximum permissible variation in wheel tread diameter when changing tyres according to the guidelines?

<p>5.0 mm for the same bogie (B)</p> Signup and view all the answers

Flashcards

Bogie frame

The frame of a bogie, typically made of welded steel, with two longitudinal girders, a cross bar, and two frame ends.

Tractive or brake force

The force generated by the motor or the brakes, transmitted through the bogie pin to the bogie frame.

Lifting supports

The mechanism on the bogie that allows lifting of the coach body, typically with steel cables between the body and the bogie.

Primary suspension

The system of springs and shock absorbers that help to absorb the shocks and vibrations from the track, providing a smoother ride.

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Secondary suspension

The system of air springs and shock absorbers located between the bogie frame and the coach body, providing secondary suspension.

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Side bearers

The mechanism that connects the bogie to the coach body, allowing movement and rotation., They are made of metal slides in oil baths and protected from dust.

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Tread brake

Type of brake that acts directly on the wheels, providing a more direct braking effect.

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Wheel Tread Diameter Variation (Same Axle)

The maximum difference in tread diameter allowed between wheels on the same axle.

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Wheel Tread Diameter Variation (Same Bogie)

The maximum difference in tread diameter allowed between wheels on the same bogie.

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Wheel Tread Diameter Variation (Different Bogies, Same Coach)

The maximum difference in tread diameter allowed between wheels on different bogies of the same coach (connected to the same train car).

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Roller Bearings

A type of bearing that uses rollers to reduce friction.

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Axle Box Housing

The housing that holds the roller bearings and axle. This is a critical component for supporting the weight of the train and ensuring smooth operation.

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Bogie Pivot Function

The pivot point in the center of the bolster is used for rotation, allowing the bogie to turn smoothly during operation.

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Floating Bolster Connection

The floating bolster is connected to the bogie frame diagonally using anchor links and silent block bushes, which absorb vibrations and transmit draw and braking forces.

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Bogie Frame Connection

The bogie frame is securely attached to the coach body through the center pivot, transmitting draw and braking forces.

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MC & HCC Bolster Connection

The MC and HCC bogie bolster is located between bogie transoms, transmitting draw and braking forces through rubbing plates.

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EMU Wheel Design

EMU coaches use composite wheels with rolled steel centers and renewable tyres. The tyres of TC bogies are fastened with glut rings, while MC/HCC bogies have additional locking keys for extra security.

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Tyre Profile and Condemning Limits

The tyre profile should match ROSO Sketch No. 91146 atl. 2 and meet condemning limits for wear and gauge tolerance as per IRCA Part IV.

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Tyre Wear Limits

The condemning limits for flange wear, root wear, deep flange, sharp flange, hollow tread wear and flat surface on tyre shall be as per the condemning gauge shown in plate 45 of I.R.CA Part IV.

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Wheel Gauge Tolerance

The wheel gauge should be within the tolerance of +2/-1 mm, ensuring proper track alignment.

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Wheel Diameter Limits

Depending on the bogie type, there are specific new and condemning diameter limits for wheels.

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What are Hydraulic Shock Absorbers?

Hydraulic shock absorbers help smooth out bumps and vibrations on the track. They work in parallel with the bolster springs and are important for a comfortable ride. They require regular maintenance to ensure they function properly.

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What is the purpose of the rubbing plate?

The rubbing plate acts as a cushion between the bolster and bogie frame. It's made of nylon and has an initial 1mm clearance on each side. This clearance is maintained during POHs by adding steel packings. If the clearance exceeds 3mm, it can cause excessive vibrations and damage.

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What are equalising stays for?

Equalising stays are crucial for maintaining the lateral stability of the bolster. These stays, connecting to the spring plank and bolster, are pinned at both ends and should be inspected and lubricated during POHs. Ensuring their free movement helps prevent strain on the bolster and avoids damaging the stays.

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What happens with excessive clearance?

The clearance between the nylon rubbing plate and steel rubbing plate needs to be maintained within a specific range. If the clearance exceeds 3mm, it can lead to excessive vibrations and harm the train's stability.

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What needs to be checked during POHs?

During periodic overhauls (POHs), the clearance between the nylon and steel rubbing plates must be checked and adjusted to maintain the specified value. Maintaining this clearance ensures a smooth and comfortable ride.

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Axle Box Cover Bolts

Bolts used to hold the axle box cover securely to the axle box housing, preventing dust and moisture from entering. Ensure they're in good condition and properly tightened, using spring washers and split pins.

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Axle Box Springs

Helical springs made of chrome vanadium or silica manganese steel. They're shot-peened for long life. Check for cracks, ensure their free height is correct, and classify them into three categories for optimal use.

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Lower Spring Seat

A component on the axle box wing that houses the dashpot's guide bush. It supports the up and down movement of the guide bush.

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Dashpot

A device filled with oil, used to control vertical movement of the axle box. It consists of a guide bush, spring seat, oil reservoir, and rubber seal.

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Axle Box Guides

Forgings welded to the bogie frame that provide accurate guidance for the wheel set. Fitted with acetal/bronze bushes for lateral and longitudinal control.

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Bolster

A component of the suspension system that sits on top of the air springs. It supports the weight of the coach body.

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Bolster Springs

Springs used to support the bolster and absorb shock loads from the suspension system.

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Wheel Set and Axle Box Assembly

A crucial set of components responsible for connecting the wheel set to the coach body, providing a smooth and stable ride.

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Suspension System

A critical system for absorbing vertical shock and preventing excessive movement of the axle box. It ensures a smooth and stable ride.

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Air Springs

A set of air springs used to provide smooth suspension to the coach. Air pressure adjusts for different loading conditions.

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TC Bogie

A type of bogie designed for train coaches with a floating bolster that is connected to the bogie frame diagonally using anchor links and silent block bushes to absorb vibrations and transmit draw and braking forces.

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MC & HCC Bogie

A type of bogie designed for train coaches with a bolster located between bogie transoms that transmits draw and braking forces through rubbing plates.

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Draw & Braking Forces

The force transmitted between the coach body and the bogie frame, responsible for pulling the train forward or slowing it down.

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Center Pivot

A component that connects the coach body to the bogie frame, allowing rotation and transmitting draw and braking forces. It acts as a pivot point.

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Silent Block Bushes

A component that helps absorb vibrations and reduces noise during train operation.

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Rubbing Plate

A flexible rubber or metal component that transmits forces between the bogie frame and the coach body, providing cushioning and absorbing vibrations.

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Condemning Limits

The wear limits for different aspects of the wheel, including the flange, root, and tread, used to determine when a wheel needs to be replaced.

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Double Row Self-Aligning Spherical Roller Bearings

These bearings are housed in precisely machined steel boxes, with light alloy covers for added protection. This design contributes to a reliable and durable axle system.

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Axle Box Covers

The steel axle box is designed with integral front and back covers secured by bolts. They are vital for protecting the bearings and axle from dirt and debris.

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Axle Box Housing: Importance

They are critical for supporting the weight of the train and ensuring smooth operation. They also house the roller bearings and axle, contributing to a reliable and robust system.

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Axle Box Covers: Durability

The axle box covers are designed to be durable, resistant to wear, and able to withstand various environmental factors, ensuring reliable performance and long-term operation.

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Axle Material: Specification

The axles are made of high-quality steel, carefully constructed to withstand the heavy loads and stresses of train operation, contributing to long-term service life and reliability.

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What is the center pivot's role in the bogie?

The central pivot is a component that connects the coach body to the bogie, allowing for rotation during turns.

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How does the center pivot handle wear?

The center pivot on MC/HCC bogies accommodates wear by using bushes between the pivot pin and bolster.

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What's unique about the trailer coach's center pivot?

The center pivot on trailer coaches is designed to transmit only tractive and braking forces, not vertical load.

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What are side bearers?

Side bearers are metal plates with a bronze wearing piece immersed in oil. They support the coach body's vertical load and allow for some movement.

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When should side bearers be replaced?

Side bearers have wear limits for both the plate and wearing piece. When wear exceeds these limits, the components should be replaced.

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Hydraulic Shock Absorbers

Hydraulic shock absorbers are fitted to work in parallel with the bolster springs, providing additional damping. They are usually maintenance-free, but require replacement if leaks or physical damage occur. Their resistance might deteriorate in service.

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Rubbing Plate in MC and HCC Bogie

The nylon rubbing plate acts as a cushion between the bolster and bogie frame, with an initial clearance of 1mm. This clearance needs to be maintained during periodic overhauls (POHs) by adjusting steel packings. Excessive clearance may cause excessive vibrations and damage to the train.

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Equalising Stays

Equalising stays connect the spring plank and bolster with pins at both ends. They prevent lateral thrust on the bolster springs. It's essential to clean and oil these pins during POHs to make sure they rotate freely. Restricted movement can strain the bolster.

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Excessive Clearance in Rubbing Plates

Excessive clearance between the rubbing plates can lead to excessive longitudinal oscillations. This may strain stay tubes and cause their breakage due to uneven wear and tear.

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Maintaining Clearance in Rubbing Plates

During periodic overhauls (POHs), the clearance between the nylon and steel rubbing plates should be checked and adjusted to maintain the specified value. This ensures a smooth and comfortable ride by preventing excessive vibrations.

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Pins in the Equalising Stays

These pins are crucial for the free movement of the equalising stays. They should be cleaned and oiled during POHs to ensure smooth operation. Additionally, it's important to use washers and split pins to prevent the pins from falling out during service.

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Free Movement of Pins in Equalising Stays

The free movement of the equalising stays is vital for preventing lateral thrust on the bolster springs. The pins should be greased regularly during POHs to ensure their free movement.

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Washers and Split Pins in Equalising Stays

Washing and split pins are essential components of the equalising stay system. They prevent the main pins from falling out, ensuring the structural integrity of the stays.

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Ensuring Free Movement of Pins

The free movement of the pins can be ensured by greasing the assembly during POHs. It's important to maintain the free movement of these pins to prevent strain on the bolster.

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Importance of Washers and Split Pins

The pins should be provided with washers and split pins to ensure that they do not fall out in service. This helps maintain the structural integrity of the equalising stays and prevents malfunctions.

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Study Notes

Bogie & Under Gears

  • Bogie Frame: A welded construction with two longitudinal girders, a crossbar, and two frame ends.
  • Tractive/Brake Force Transmission: Transmitted via a bogie pin from the bogie to the body.
  • Frame Ends: Used to house brake cylinders and brake rigging.
  • Tread Brakes: Directly affect vehicle wheels.
  • Lifting Supports: Four steel cables located between the body and bogie.
  • Primary Suspension: Uses helical springs working in parallel with dashpots.
  • Secondary Air Suspension: Provides buffer height, brake rigging, wheel axle, and hydraulic shock absorbers. Refer to CMI-K001 (2000), Amendment Slip No. 1 (2007), and CMI-9802 (2008) for details.
  • Lifting Support: Hydraulic shock absorbers are used for support function.

Bogie Frame Assembly

  • Bogies (MC, HCC, TC): Motor coaches, high-carrying capacity coaches, and trailer coaches have all-welded, lightweight construction.
  • Axles: Feature self-aligning roller bearings, mounted inside cast steel axle boxes, with rigid guidance from telescopic dashpot and axle box guide assemblies.
  • Bolster (MC, HCC): Located between bogie transoms, transmits draw and braking forces through rubbing plates.
  • Bolster (TC): Floating bolster secured in longitudinal direction to bogie frame with two anchor links and silent block bushes.
  • Suspension: Uses helical springs and dashpots for primary suspension; air springs supported on a spring plank via swing links for support.
  • Weight Transfer: No weight is transferred through the bogie pivot; it acts as a center of rotation, transmitting acceleration and deceleration forces.

Wheel and Axle

  • Wheel Design: EMU coaches have composite wheels with rolled steel centers and renewable tires.
  • Fastening: Different designs: TC bogies use glut rings, while MC/HCC bogies use glut rings and four locking keys for secure fastening.

Tyre Profile

  • Profile Standard: Follows ROSO Sketch No. 91146.
  • Condemnation Limits: Defined for flange wear, root wear, deep flange, sharp flange, and hollow/flat tread wear (refer I.R.CA Part IV, plate 45).
  • Wheel Gauge: Must be within the tolerance of +2/-1 mm.
  • Wheel Dimensions: Provides specific dimensions for MC, TC, and HCC bogies (New, Condemning, and Last Shop Issue).

Permissible Variation

  • Wheel Tread Diameter: Variations are allowed during wheel replacement, based on axle and bogie.

Material Specifications

  • Tyres: Conform to IRS Specification R-15/95.
  • Axles: Follow IRS Specification R-16/95 (TC bogies) and R-43/92 (MC & HCC bogies).

Roller Bearings

  • Types: MC and HCC bogies use No. 22328 C/C3 self-aligning roller bearings; TC bogies use No. 22326 C/C3 self-aligning roller bearings.

Axle Box Housing

  • Material: Cast steel.
  • Covers: Light alloy front and back covers secured by bolts.
  • Maintenance: Regular cleaning and examination of cracks, worn threads, etc., for bolts and covers are required.

Axle Box Springs

  • Type: Helical.
  • Material: Chrome vanadium, silica manganese steel.
  • Treatment: Shot-peened to improve fatigue life.
  • Maintenance: Checking for cracks and measuring free height is crucial.
  • Grouping: Springs are grouped into three categories based on RDSO Technical Pamphlet No. C-8419 (Rev 1).

Lower Spring Seat

  • Wear: Minimal wear during service.
  • Repair: Repair/replacement if wear exceeds 0.4 mm or damage is present.

Dashpots and Axle Guide Assemblies

  • Axle box guides: Machined hollow forgings welded to the bogie frame to ensure rigid guidance of the wheel sets.
  • Sealed: Sealed with rubber rings ensuring oil tightness.
  • Topping-up: Provides provision for topping-up oil (MC & HCC); holes are provided in trailer coaches for topping up.

Bolster and Bolster Spring

  • Bolster Location: Rested on both ends of air springs.

Hydraulic Shock Absorbers

  • Function: Work in parallel with bolster springs for smooth operation.
  • Maintenance: Regular checks and replacement if leaked or physically damaged.

Rubbing Plate

  • Material: Nylon.
  • Function: Cushions between bolster and bogie frame.
  • Clearance: Maintenance of 1 mm clearance (each side) is required during POH (Periodic Overhaul).
  • Wear Limit: Wear shouldn't exceed 3 mm (each side) during service, else repair and fitting of steel packings are required.

Equalising Stays

  • Function: Prevents lateral thrust on bolster springs.
  • Maintenance: Pins need regular cleaning and oiling to ensure smooth rotation.

Centre Pivot

  • Mechanism: Used to transfer forces between the vehicle's body and bogie.
  • Wear: Bogie rotation results in wear on upper and lower bushes.
  • Types: Arrangements exist for MC & HCC bogie and Trailer bogies.
  • Cracks: Check for cracks at the weld points and rubber conditions on silent blocks.
  • Testing: Silent blocks must be duly tested.
  • Assembly: Ensure no forcing during assembly to avoid pre-loading condition.

Hanger and Hanger Blocks

  • Cleaning: Thorough cleaning is necessary after dismantling.
  • Inspection: Examine for cracks and wear.

Bogie Brake Gear

  • Clearance: Maximum permissible clearance between brake gear pins and bushes is 1 mm; any more indicates repair or replacement is necessary.
  • Brake Block Thickness: Brake blocks must be replaced when thinning down to 16 mm.
  • Maintenance: Regular maintenance to adjust slack in rigging, with adjusting palm pull rod featuring holes displaced to account for wear.

Buffing & Draw Gear

  • Couplers: Semi-permanent/semi-automatic Schaku couplers used.
  • Maintenance: Adherence to manufacturer-supplied maintenance manuals.

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Maintenance Manual for AC-DC EMU (Siemens) PDF

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Explore the intricacies of bogie and under gear systems in this quiz. Learn about various components, such as bogie frames, tractive forces, and suspension types. This knowledge is essential for understanding vehicle stability and performance.

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