maintanence schedule for signaling gears used over indian railways

CAMTECH/S/2005/MSCH/1.0

Maintenance Schedule of signalling gears March 2005

1

MAINTENANCE SCHEDULE OF SIGNALLING GEARS

Introduction Signalling plays a vital role to run the train safe and punctual. To achieve this, the working of signalling gears should be efficient and reliable. It is the duty of every signalling staff to carry out the effective maintenance and testing for smooth working of signalling gears. Mainly signalling gears may be classified mainly as

• Electrical signalling gears • Mechanical signalling gears

1. Electrical Signalling Gears

SN

MAINTENANCE WORK

Maintenance schedule for Signal

MaintainerJE/SE (Sig)

SSE (Sig)

Token Block Instrument - Single line Neal’s Instrument 1. Check locking and

sealing F

(Fortnightly) M

(Monthly) Q

(Quarterly) 2. Check the SM’s lock up

key working. F M Q

3. Check whether instrument is due for overhaul

---- HY (Half

yearly)

A (Annually)



2

SN

MAINTENANCE WORK



SSE (Sig)

4. Check the distinctiveness of the tone of bell when two or more instruments are provided.

---- HY (Half yearly)

A

(Annually)

5. Check the instrument is level

---- HY A

6. Check the polarity of instruments

---- Q HY

7. Check and ensure the full deflection of needle indicator

F M Q

8. Check the token for Burr, etc.

F M Q

9. Check the token indicator is free

F M Q

10. Check the force drop arrangement for TCF and TGT locks. Also check the edge of the locks for square.

F M Q

11. Check the polarised relay returns to its normal position

-- -- Q

12. Check the safety catch is in position and free to move about its fulcrum pin

F M Q

13. Check the spigot for its tightness

F M Q

14. Check that token -- -- A



3

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MAINTENANCE WORK



SSE (Sig)

receiver can receive only the token of the correct configuration.

15. Check that the tablet releaser actuating link screws are intact.

F M Q

16. Token census -- HY -- 17. Clean rack and pinion

teeth and lubricate with axle oil medium grade to IS:1628

F M Q

18. Inspect contact surfaces and spring tensions. If pitted, clean them with chamois leather

Q Q Q

19. a) Check Earth connections

b) Measurement of earth

M

--

M

Y

Q

Y

20. Check the telephone and telephone cord

M M Q

21. Check the block and telephone batteries for cleanliness and voltages recorded in the card

*F Weekly in

case of secondary

cells

M Q

22. All wiring of the instruments must be checked

-- Q Q

23. Measure the line current Q Q Q



4

SN

MAINTENANCE WORK



SSE (Sig)

Block Instrument Double Line 1. Check locking and

sealing and proper working of SM’s lockup key

F (Fortnightly)

M (Monthly)

Q (Quarterly)

2. Check whether the instrument is due for overhaul, and the register maintained as per para 18.35 of SEM

-- M Q

3. Check and ensure full deflection of indicators

F M Q

4. Check the polarised relay returning to its normal position when no current is flowing

F M Q

5. Check that electrical and mechanical locks are in proper condition

F M Q

6. Check all the contacts are clean and free from pitting

F M Q

7. Check all springs are in good condition and kept properly adjusted

M M Q

8. Check that all terminal screws lock nuts and locking screws are kept tight and split pins opened.

F M Q



5

SN

MAINTENANCE WORK



SSE (Sig)

9. Check block and telephone batteries are kept clean, terminals tight and free from dirt or corrosion. Record the value of batteries.

*F weekly in

case of secondary

cell

M Q

10. Check whether LSS can be taken OFF without line clear and automatically replaced to ON when train enters the block section.

F M Q

11. Check the release circuits for proper making and effective proving of all controls

-- M Q

12. Check the telephone and its cord

F M Q

13. Measure line current Q Q Q Token Less Block Instruments – Single Line (A) Handle Type Instruments 1. Check locking and

sealing and proper working of SM’s lockup key

F (Fortnightly)

M (Monthly)

Q (Quarterly)

2. Check whether the instrument is due for overhauling

---- M Q

3. Check and ensure full deflection of indicators

F M Q

4. Check all contacts are F M Q



6

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MAINTENANCE WORK



SSE (Sig)

clean and free from pitting

5. Check that all-mechanical parts such as springs, screws and nuts etc. are in good condition.

F M Q

6. Check block and telephone batteries are kept clean, terminals tight and free from dirt or corrosion. Record the values of the batteries

*F weekly in

case of secondary

cells

M Q

7. Check whether LSS can be taken off without line clear and is automatically replaced ON when train enters the block section.

F M Q

8. Measure line current Q Q Q 9. Check working of all

counters -- M Q

10. Check that shunting key is released in line closed or TGT position

F M Q

(B) Push Button Type Instrument 1. Check that block

instruments are free from mechanical damage, corrosion etc. All nuts / bolts are

F (Fortnightly)

M (Monthly)

Q (Quarterly)



7

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MAINTENANCE WORK



SSE (Sig)

secure and complete. 2. Check the locking and

sealing of all relays and counters

F M Q

3. Check that push buttons and indicators are free damage and are in the working condition

F M Q

4. Check that shunting key is released in line closed or TGT position

-- M Q

5. Measure line current Q Q Q 6. Check the telephone and

its cord F M Q

7. Check that relays, bell and buzzer are free from mechanical damage

F M Q

8. Measurement of insulation.

Q Q Q

COLOUR LIGHT SIGNAL 1. Cleaning of inner and

outer lenses, housing of signal units and protective wire mesh..

F (Fortnightly)

M (Monthly)

Q (Quarterly)

2. Check the lamps are replaced as per the extant instructions.

F

M

Q



8

SN

MAINTENANCE WORK



SSE (Sig)

3. Check the lamps are working at 90% of rated voltage

F

M

Q

4. Check the lamps used are tested prior to replacement

---- M

Q

5. Check the bulbs are seated properly

F

M

Q

6. Check the focussing of signals

M

M

Q

7. Check all adjusting nuts are properly tightened

F

M

Q

SIGNAL MACHINE 1. Check the machine is in

good condition, free from dirt, rust and dust, peeling off of electroplating.

F

M

Q

2. Check the lubrication of all the gearing and bearings

F

M

Q

3. Check all the contacts for cleanliness, freedom from pitting and proper adjustment

F

M

Q

4. Check the cleanliness and smoothness of the Commutators

F

M

Q



9

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MAINTENANCE WORK



SSE (Sig)

5. Check and drain out any oil accumulated at the bottom of the case. Oil the machine with good quality high grade lubricating oil to IS-1628

F

M

Q

6. Check smooth operation of gear train free of noise.

F

M

Q

7. Check the wear on the brush. If the wear is such that the tensioning spring touches the brush carrier, replace the brush.

F

M

Q

8. Conduct positive test-Take off signal, observe latching without clutch slipping, if clutch slips, adjust the clutch

F

M

Q

9. Negative test-Near 45° and near 90° before hold off device engages, cut off feed-signal should return to ‘ON’

----

M

Q

10. Check the gasket on the cover in position

F

M

Q



10

SN

MAINTENANCE WORK



SSE (Sig)

11. Check the effectiveness of snubbing: On closing the

machine circuit the motor operates smoothly, the hold off device is effective and the arm is taken OFF correctly.

On opening the machine circuit the signal arm returns to ON position smoothly without jerks and snubbing is effective and there is no tendency to stick and jamming in OFF position.

Normal and reverse stop provided outside the machine are kept properly adjusted so that the machine stops without any jerk in both ON and OFF positions.

F

M

Q



11

REVERSERS 1. Check oiling of all

moving parts. Ensure oil holes are not clogged by dirt or excessive oil. Lubricate with axle oil medium to IS:1628-ball bearing must be greased with graphited grease(grease A no. 0 to IS:408

F

M

Q

2. Remove the dash pot assembly from reverser and check if the oil level is lower than 35mm above of the sliding cylinder. Insulation oil for transformer to IS: 335 shall be used for topping up. As the gap between sliding cylinder and plunger is very little, any sludge in the oil will block the passage and may affect the functioning of dash pot. If the oil is found to be sludgy, it shall be removed. Check the dash pot spring is not broken or cracked.

----

---

Y



12

SN

MAINTENANCE WORK



SSE (Sig)

3. Check screws, bolts and nuts – open split pints

F

M

Q

4. Check the surfaces of armature and core are clean. Check the lubrication of sliding bar of electromagnet and see it slides freely in the bracket

F M Q

5. Polarity to the coil of reverser to be changed

M -- ---

6. Check the voltage and current of reverser coil

-- M Q

7. Check the insulation of coil

-- Q HY (Half

Yearly) 8. Check the position of

spectacle lever and operating lever to see whether arrow mark on them coincide with the arrow marks on the bridge. If the marks are shifted, check if the dash post spring has lost tension or the down rod has loosened. Action to be taken as situation warrants.

F M Q



13

SN

MAINTENANCE WORK



SSE (Sig)

POINT MACHINES 1. Check the machines are

kept free from rust, dirt and fixtures. Check the tightness.

F M Q

2. Check the lubrication of all gears and bearings

F M Q

3. Check the cleanliness and smoothness of Commutators.

F M Q

4. Check the contacts for freedom from pitting and proper adjustment

F M Q

5. Check for proper ballasting and packing of sleepers

F M Q

6. Tighten all nuts and check nuts and bolts. Tighten lock nuts holding the detector slides and lock slides with lugs are kept tight. After tightening the nuts and lock nut should be turned in opposite direction towards each other to lock the nut.

F M Q

7. Check the wires carefully to keep them neatly dressed and clear of all moving parts.

F M Q



14

SN

MAINTENANCE WORK



SSE (Sig)

Check that wires do not get trapped in the lid when closed.

8. Lubricate the slides, roller and pins with axle oil medium grade to IS:1628 avoid overflow of oil.

F M Q

9. Ensure all the bridge contacts make and break at the same time.

F M Q

10. Check the pins of switch extension piece for any rib formation or excessive wear.

F M Q

11. A) Obstruction test Obstruction test of points with 5 mm test piece to ensure point can not be locked, detection contact should not assume the position indicating point closure and friction clutch should slip. (separate register to be maintained for this test.) B) Obstruction test with crank handle for normal and reverse to check that friction locking detector contacts just make with

F M Q



15

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MAINTENANCE WORK



SSE (Sig)

1.6 mm obstruction and break with 3.5 mm obstruction.

12. Check the functioning of overload arrangement and out of correspondence.

F M Q

13. Check the tripping at overload of friction clutch

---- M Q

14. Insulation test on the point machine to be conducted

---- HY

Y ( yearly)

15. Check all grease nipple provided are in position. Recommended type grease should be used

M Q HY

16. Check the setting of the switches for having required amount of spring action.

F M Q

17. Measure the voltage and current at motor terminals for both normal and reverse operations. These should be within the specified limits according to the different types of point machines.

---- M Q



16

SN

MAINTENANCE WORK



SSE (Sig)

ELECTRICAL DETECTORS 1. Check that contacts

make and break at same time. Check that the cross protection contact makes only after concerned detection contact open. Normal detection opens then only normal shunt contact to close and vice-versa.

F M Q

2. Check that sleepers are packed well.

F M Q

3. Check tightening of all nuts and screws

F M Q

4. Check slides and rollers are lubricated with axle oil grade Medium to IS:1628

F M Q

5. Check the wires are neat and tidy

F M Q

6. Obstruction test F M Q RELAYS 1. Check deposit of dust on

relays and clean. F M Q

2. If any high resistance on any contact, SEM-II para 19.138 to be adhered to

WN (when

necessary)

---- ----



17

SN

MAINTENANCE WORK



SSE (Sig)

3. Visual inspection of plug-in relays and maintenance register

TY (once in three

years)

---- ----

4. Check overhauling of shelf type track and line relays

----

----

Q

5. Check the accuracy of Time Delay Circuits

---- M Q

STATION MASTER’S SLIDE CONTROL FRAME 1. Check free working of

all slides F M Q

2. Check proper making of all contact springs.

F M Q

3. Check the condition of the wiring.

F M Q

4. Test the mechanical locking

---- ---- Y

KEY TRANSMITTERS 1. Check lubrication and

free working of all moving parts.

F M Q

2. Check cleanliness and good adjustment of all contact springs.

F M Q

3. Check the keys of one transmitter does not fit in any other transmitter at that station.

---- M Q

4. Check and ensure that key cannot be extracted irregularly

F M Q



18

SN

MAINTENANCE WORK



SSE (Sig)

5. Check the seals are intact

F M Q

LEVER LOCKS 1. Check cleanliness and

lubrication of all working/moving parts.

F M Q

2. Check the forced drop feature of the lever locks

F M Q

3. check the notches are square and true

F M Q

4. Tighten all bolts, nuts, terminals and locking screws

F M Q

5. Check the cleanliness and proper adjustment of contacts

F M Q

6. Check contacts are not making other than the required position.

F M Q

7. Check that the lever cannot be made free other than in release condition

---- M Q

ARM AND LIGHT REPEATER 1. Check that the circuit

controllers are rigidly fixed to the signal post.

F M Q

2. Check the circuit controller adjustment

F M Q



19

SN

MAINTENANCE WORK



SSE (Sig)

3. The audible warning device where provided is in order. Check the wiring is protected.

F M Q

4. Check that thermostat contacts are correctly adjusted and in working order.

F M Q

5. Check correct functioning and ensure that no conflicting indication is available.

F M Q

Axle Counter Outdoor Equipment: 1. Check all nuts and bolts

of base clamps, receiver and transmitter housings and ensure they are fully tight.

W

---

---

2. Inspect the wiring loops and ensure they are in good condition and the connections are tight.

W --- ---

3. Check the ‘Staggering’ of the rail inductors. Check staggering has not been affected by excessive rail creep.

W --- ---

4. Observe the packing condition of supporting sleepers and ensure the

W --- ---



20

SN

MAINTENANCE WORK



SSE (Sig)

fittings do not vibrate heavily during passage of trains. If necessary, get the sleepers packed well..

5. Inspect all connections on the oscillator/amplifier unit and ensure they are tight.

W --- ---

6. Check the screw coupler on the oscillator/receiver amplifier unit and ensure they are tight.

W --- ---

7. Measure the amplifier output voltage of both channels and ensure they are within the prescribed limits.

W --- ---

8. Inspect the battery. Check electrolyte level, specific gravity and voltage.

W --- ---

9. Inspect the charging equipment. Measure charging current and ensure it is neither too low nor too high.

W --- ---



21

SN

MAINTENANCE WORK



SSE (Sig)

10. Interference with power supply, connections of oscillator/receiver amplifier and transmitter and receiver coils are likely to cause random counting in the Evaluator and should be done only after ensuring that no train is occupying or approaching the controlled section.

W --- ---

11. Inspect the track circuit, its connections, rail joints etc. and ensure everything is in good condition.

---- M Q

12. Check the transmitter housing and its aluminum clamps, holding bolts and nuts and ensure these are fully tight.

---- M Q

13. Check the receiver housing holding bolts and nuts and ensure these are fully tight.

---- M Q



22

SN

MAINTENANCE WORK



SSE (Sig)

14. Check the oscillator output voltage and frequency. It should be within the permissible limits.

---- M Q

15. Check the oscillator output wave shape is sinusoidal.

---- M Q

16. Check indication lamps in Station Master’s resetting box are lighting in correct sequence.

---- M Q

17. Ensure output level of receiver amplifier is 0.7 to 1 Volts rms.

---- M Q

Indoor Equipment (Evaluator): 1. Ensure the screw

coupler connectors are fully tight.

F M Q

2. Measure the incoming voltages of all channels and ensure they are within the prescribed limits; Record the readings.

F M Q

3. Check that all indication lamps are lighting in correct sequence.

F M Q



23

SN

MAINTENANCE WORK



SSE (Sig)

4. Observe the reading on the display unit after passage of a train and compare it with the actual number of axles of the train. Verify that the counting is correct.

F M Q

5. Measure the coil voltages on Evaluator and Supervisory relays and ensure that they are within permitted limits.

F M Q

6. Measure the voltages on Evaluator and Supervisory relay coil terminals when the relays are de-energised and ensure that the voltage is not more than 0.5 V

F M Q

7. Inspect the battery. Check electrolyte level, specific gravity and voltage. Efficient maintenance of the battery is a must for the correct performance of the equipment.

F M Q

8. Inspect the charging equipments. Measure charging current and ensure it is neither too

F M Q



24

SN

MAINTENANCE WORK



SSE (Sig)

low nor too high. 9. Measure the dc-dc

converter output voltages and record the voltage readings.

F M Q

10. Interference with power supply and evaluator connections is likely to cause random counting of the evaluator and should be done only after ensuring that no train is occupying or approaching the controlled section.

F M Q

11. Ensure the reading of the Reset counter tallies with that recorded in the register.

F M Q

12. Ensure the ‘Reset’ switch is in the ‘Normal’ position and is sealed properly after the maintenance and inspection.

F M Q

13. Check the 5 KHz input signal of each channel . Ensure there is no interference and modulation.

--- M Q

14. Safe working of the axle counter shall be checked

--- M Q



25

SN

MAINTENANCE WORK



SSE (Sig)

with the help of dummy wheel

15. Check working of trolley protection circuit.

--- M Q

16. With unequal counts (train in controlled section) ensure that both ‘SUP’ and ‘EV’ relays are de-energised and voltages on relay terminals are less than 0.5 V.

--- M Q

17. Switch ‘ON’ and ‘OFF’ the battery charger at quick intervals. Ensure that no false count is registered by the evaluator.

--- M Q



26

SN

MAINTENANCE WORK



SSE (Sig)

Inspection after repairs 1. When repairs involving

charge of components are carried out the concerned card should be tested thoroughly as per the detailed test schedule issued by RDSO. Such repairs should normally be carried out only at the central repair center where necessary calibrated instruments required for the purpose are available.

WN (When necessary)

S.N.

MAINTENANCE WORK TO BE DONE

Schedule for Electrical Signal Maintainer

Electrical Lifting Barrier 1. Check that machines are in good

condition free from dust, rust, dirt F

2. Check that moving parts are lubricated properly

F

3. Check the contacts are clean and in proper adjustment.

M

4. Check the Commutator is clean and smooth.

M

5. Check the friction clutch, declutches M



27

SN

MAINTENANCE WORK



SSE (Sig)

when the boom is fully raised or lowered.

6. Check the adjustment of shock absorber

M

7. Check the time of operation, voltage and operating current.

Q

8. Check the gear box is filled with lubricating oil to its level.

F

Gate Lock 1. Check that gate lock are lubricated

regularly. F

2. Check that ‘E’ type locks are in good working order.

M

3. Check that gate locks are properly fixed.

M

4. Integrity of interlocking shall be checked.

M

General 1. Check the signal wire transmission

is in good working order with special reference to wires crossing Gate.

F

2. Audio visual warning F 3. Approach warning F Telephone Communication 1. Telephone communication between

gate and SM’s office/cabin F



28

2. Mechanical Signalling Gears SN


Maintenance schedule for Signal Maintainer

JE/SE (Sig)

SSE (Sig)

CABIN 1. Cleaning the ground floor and

locking F

(Fortnightly) M

(Monthly) Q

(Quar-terly)

2. Checking cabin diagram, pull chart, station working instructions, maintainer’s programme up to date and warning board(D.W. cabin)

----

M

Q

3. Test locking against interlocking table and yard diagram and broken wire test (if D.W.)

---- Random check

Y

4. Check the sealing and locking of interlocking tray, resetting handle box, etc.

F M Q

5. Check the lever frame is due for overhauling.

-- M Q

6. Check the installation as per current plan

-- M Q

7. Check the inter changeability of the keys of padlocks where available

F M Q

8. Check from the operator any defect or discrepancy of the gears

F M Q

9. Conduct dynamometer test, if double wire frame

-- -- HY



29

SN



JE/SE (Sig)

SSE (Sig)

10 Check the signals are visible from place of operation

F M Q

LEVER FRAME 1. Check the bolts and nuts for

tightness and opening of split pins including the safety bolts of DW compensator

F M Q

2. Lubricate all accessible parts F M Q 3. Operate lever and check that

full stroke is transmitted M Q HY

4. Check the painting of levers Q HY 5. Check the tripping of DW

clutch lever M Q

6. All connections including down rods must be examined to detect cracks, slipped threads and spacing

F M Q

7. Check the pulley block in DW cabin is in order

F M Q

8. Check the double wire compensator that when the transmission is at rest, both the grips of locking pawl disengaged with the teeth of ratchet rod. The weights must be floating freely and in level with each other. During lever operation, check that they engage with the ratchet rod teeth.

M Q HY

9. Adjust weight levers in such a way that during the hottest

M Q HY



30

SN



JE/SE (Sig)

SSE (Sig)

period of the day the lever must not reach the breakage mark on the ratchet rod.

10 Check the lubrication of compensator wheel grooves and wire rope with graphite grease Gr.I to IS508 Check the lubrication of moving parts with axle oil. Check the lubrication where nipples are provided with grease IS507.

F M Q

11 Check the drum lock fitted on coupled clutch / clutch/ direct levers for effectiveness

F M Q

LEADOUTS AND CRANKS 1. Examine, clean, oil and

observe cranks and wheels for lost motion or worn out parts and check the foundations are rigid. All badly worn out pins be replaced.

F M Q

RODDING RUN 1. Check the rodding run in true

alignment, spacing of roller trestles, free from vegetation growth.

F M Q

2. Check the rollers are moving freely and replace the missing or broken parts and check whether the alignment requires earth work.

M Q HY



31

SN

MAINTENANCE WORK

Maintenance schedule for Signal Maintai

ner

JE/SE (Sig)

SSE (Sig)

3. Check joints are good and make solid connections

F M Q

4. Check the rodding run under the track is clear of rail obstruction

M Q HY

5. Check the couplings, adjusting screws and joints for looseness, slipped threads or slack nuts and lubricate threads.

F M Q

6. Check the rodding run for any weak places due to rust corrosion etc.

M Q HY

7. Check the position of compensators when a point or lock does not work properly

As and when

required.

-- --

8. Check whether roller trestles requires realignment due to shifting or sinking

Q HY Y

9. Check the adjusting sleeves of the adjusting crank and check for loss of stroke

Q HY Y

WIRE TRANSMISSION (SINGLE WIRE) 1. Check for alignment level,

corrosion and for kinks M Q HY

2. Check for wear on the pulleys, damaged or broken

M Q HY



32

SN

MAINTENANCE WORK


ner

JE/SE (Sig)

SSE (Sig)

pulleys to be replaced 3. Check the wire run

underneath the track for rubbing against ballast, bottom of rails or sides of sleepers and also for corrosion and kinks in the troughing underneath level crossing

M Q HY

4. Check the wire joints and split links and adjacent joints do not get entangled

M Q HY

5. Check for spacing of stakes (not more than 10m is allowed).

M Q HY

6. Check wheels are rigidly fixed on foundation and replace worn out wheels.

M Q HY

DOUBLE WIRE 1. Check all transmission work

freely and loss of stroke at the end of the transmission must be avoided.

F M Q

2. Check all the pulleys are parallel to the wire run. Check that there is no binding in any part of transmission

F M Q

3. Check the spacing of the stakes is not more than 15m

M Q HY



33

SN

MAINTENANCE WORK


ner

JE/SE (Sig)

SSE (Sig)

for points and detector & 20m for signals.

4. Check disconnecting pins are available at the end of transmission for conducting broken wire test

M Q HY

5. Check pull wire and return wire are properly identified by painting

M Q HY

6. Check the wheel guides are intact and avoid wire slipping from turnout wheels

M Q HY

POINTS 1. Cleaning and lubricating of

moving parts. Also check points chairs are cleaned regularly by permanent way staff.

W M Q

2. Check the gauge of the points, opening of the switches, and squaring and packing condition of sleepers under gauge tie plate and slide chair fixing bolts.

W M Q

3. Make visual check regarding the condition of switches sleepers gauge tie plate.

W M Q (Jointly with

P. Way Supervisor)

4. Check the switches are housed properly against

W M Q



34

SN

MAINTENANCE WORK


ner

JE/SE (Sig)

SSE (Sig)

stock rail and check spring on the switches equally in the normal and reverse positions.

5. Check the point for obstruction test

W M Q

6. Check the ends of plunger of the lock and notches are square

W M Q

7. Check the lock plunger of the lock is 12 mm clear from the stretcher blades when unlocked. In case of EFP locks, check locking dog protrudes 3 mm (at least) after locking both the stretcher

W M Q

8. Check for tightness of bolts and nuts and arrange for tightening/ replacing missing bolts and nuts of flexible stretchers

W M Q

9. Check lock bars are straight and examine the driving pieces for looseness

W M Q

10 Check the lock bars clips and stops for tightness and lubricate the bearing of clips

W M Q

11 Badly worn out clips to be replaced and check if creep

W M Q



35

SN

MAINTENANCE WORK


ner

JE/SE (Sig)

SSE (Sig)

is affecting the working of lock bar

12 Check that lock bars lie 38mm below the top of the rail

F M Q

13 Check the broken wire locks and test for easy movement and also check the point mechanism is butting against its stop in normal and reverse

W M Q

14 Check that no two similar wards exist for conflicting train movements for hand plunger lock, lever lock.

-- M Q

DETECTORS 1. Check the signal wires to the

detectors are in alignment and check when the signal is returned to ON all signal slides are travelling back to their stops

F M Q

2. Check for obstruction test W M Q 3. Lubricate the detector slides

thoroughly check the cross slides for any undue play. Also check the detectors are fixed rigidly.

W M Q



36

SN

MAINTENANCE WORK


ner

JE/SE (Sig)

SSE (Sig)

SIGNALS 1. Check the condition of

the post, fittings, level of arms and the post are properly plumbed and lubricate working parts

F M Q

2. Inspect the platforms where provided for decayed or loose boards.

F M Q

3. Cleaning of the roundels, glasses and lenses

Applicable for traffic staff

4. Check the founts of signal lamps are good repair. Check for damaged flame guard, leaky founts and broken burners and non standard wick

F M Q

5. Check the focussing of signal

M M Q

6. Testing of signals M M Q 7. Where double wire signal

mechanism is used check lubrication of cam path

F M Q

8. Check all signal lamps are overhauled

Y Y Y

9. Cleaning of signal arms. Painting to done if required

Q HY Y



37

SN

MAINTENANCE WORK


ner

JE/SE (Sig)

SSE (Sig)

10 Check adjusting of back light

M Q HY

Mechanical Lifting Barrier S.N.


Maintenance schedule for Electrical/Mechanical Signal Maintainer

1. Check that mechanism is kept in good condition free from dust, rust, dirt etc.

F

2. Check that moving parts, gate locks are lubricated properly

F

3. Proper adjustment of wire sag and tension shall be made

M

4. Integrity of boom locking and ‘E’ type lock locking the winch shall be checked.

F

5. Integrity of interlocking shall be checked.

M



38

Mechanical Lifting BarrierS.N.


Maintenance schedule for Electrical/Mechanical Signal Maintainer

6. Cleaning of all pipes and ducts to prevent obstruction by accumulation of dirt shall be ensured.

Q

7. Audio visual warning F 8. Approach warning F

maintanence schedule for signaling gears used over indian railways

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