I have some(very long infact) info about AC Locos(copied from IR site):
The maintenance and overhaul schedules to be followed for AC electric locos are as under.- Nature of Inspection/overhaul Place where to be carried out
i) Trip Inspection, IT Outstation shed or homing loco shed as convenient.
ii)...
more... Monthly Inspection, IA + 5 days Homing or nominated Electric Loco Shed
iii) Two-monthly Inspection, IB + 5days. Homing Electric Loco Shed
iv) Four monthly Inspection, IC + 10 days Homing Electric Loco Shed
v) Annual overhaul, AOH + 15 days. Homing Electric Loco shed
vi) Intermediate overhaul, IOH 300,000 km after POH or first commissioning or 3 years whichever is earlier � 1 month. Homing Electric Loco Shed or Nominated Workshop.
vii) Periodical overhaul (POH) 600,000 km after commissioning or last POH or 6 years whichever is earlier � 3 month. Workshop nominated for the purpose
BUT the list is quite long for inspection:
INSPECTION OF ELECTRIC LOCOS
A. Trip Inspection (TI)
The trip inspection is mainly required for topping of oils, distilled water in batteries and attention to various minor defects which have been recorded in the log book. In addition certain checks are necessary mainly due to severe environmental conditions (hot, humid and dusty) existing in the country.
1. Periodicity of trip inspection shall be as follows:
Type of service Periodicity
i) Passenger/Mail/Express Train locos Every 2500 km or one trip
whichever is later.
ii) Frieght locos 5000 km or 10 days
whichever is earlier.
2 During trip Inspection the Engine Examiner will �
a) Carryout detailed checks in regard to any unusual occurrence reported by the drivers in the loco log book.
b) Visually inspect the auxiliaries for satisfactory starting and operation.
c) Feel by hand the temperature of axle roller bearings.
d) Visually inspect mechanical components like springs, equiliser pin, dampers etc. and the brake rigging to detect any abnormality.
e) Check the controls and indication and alarm circuits for correct functioning.
3. Specific items to be attended in TI are-
a) General roof inspection : Check the roof generally for any foreign materials such as wire pieces; clean the Insulators and check visually for cracks or chips; Check for abnormalities such as flashovers;
b) Pantographs : Check for copper deposition, grooving of strips and proper lubrication; visually check springs and articulation and also test raising and lowering;
c) Air Blast Circuit Breakers/Vacuum Circuit Breaker : Check for satisfactory operation.
d) Return Current Shunt : Check the shunt connections between the body/ bogie frame/axle boxes, traction motor/axle are intact, tighten if necessary.
e) Bogies : Remove foreign matter and dirt picked up on run. Visually inspect for loose, defective or missing parts.
f) Battery : Check and record battery voltage; top up cells as required.
g) Auxiliaries : Check all auxiliaries for correct operation;
h) Oil level: Check and top up oil in suspension bearing, exhausters, compressors, auxiliary compressors and gear cases and record in the log book.
i) Air Reservoirs : Drain all accumulated water from all reservoirs.
j) Cab and Floor : Clean the cab and dust the flooring; and remove oily deposits.
k) Controls and Indications : Visually check and test for proper operation of the master controller, the tap changer, all EP contactors, wipers, whistles, brakes, auxiliary equipment and indication and alarm circuits.
l) Transformer oil level : Check oil level; ascertain the cause if it is low/high.
m) Clean look out glasses.
n) Adjust the brake block, if the locomotive moves on the second notch (with N32 tap changer)/fourth notch with N40 tap changer) with full application of locomotive brakes.
o) Check the following safety items.
Speed recorder / speed indicator for any abnormality
Flasher lights, head lights, marker lights etc.
Wipers
Sanding gear for any abnormality. Fill sand boxes with sand of specified quality.
Wheel and axle for visual defects such as shelling cracks, flat spots etc.
Brake gear for (i) loose fasteners (ii) brake shoe wear, (iii) brake shoe release, (iv) operation of all the brake cylinder pistons and (v) leakage in the bogie hose pipe.
CBC & draft gear
Safety sling of brake shoe holder Brake pull rod safety brackets Safety brackets
Cattle guard Rail guard
RSI & RS2 emergency brakes
Gear case for any missing parts and loose fasteners.
Hand brakes
VEF
HQOP position
Isolation of any component
Vacuum on disc and dummy/BP and FP pressure and leakage
4. Wherever time and facilities are available, the passenger locomotives should immediately be washed.
5. Test the locomotive on HT and LT and record observations on the test proforma.
B. IA, IB, IC, AOH Inspections.
The following tests should be carried out before and after inspection of a locomotive :
a) Preliminary tests with 25 kV supply on -
i) Measure and record battery (BA) voltage.
ii) Measure and record Generator (GE) or battery charger voltage.
iii) Check time taken to build up compressed air pressure from 1 kg to 8-9 kg/ cm2
iv) Check cut in and cut out pressure of compressor Regulator (RGCP).
v) Check blowing out of safety valves.
vi) Check vacuum obtainable with Driver Braking control Valve (MPF) on 'run' and quick release positions.
vii) After building up vacuum, check for vacuum leakage for 5 mt.
viii) Check vacuum drop required for brakes to apply.
ix) Note: pressure guage reading when brakes are applied.
x) Check working of braking electro-valve VEF.
xi) Check working of blowers under "direct' and 'automatic' starting conditions,
xii) Note and record air leakages for one minute in main reservoirs and brake cylinders,
xiii) Test headlights,
xiv) Test working of cab heaters and fans.
b) Preliminary tests with 25 kV supply off --
i) Measure and record time required for raising and lowering both the pantographs.
ii) Measure and record time taken for various time-delay relays.
iii) Test functioning of Auxiliary circuits Earth Relay (QOA) by creating an earth fault.
iv) Test functioning of Power circuit Earth Relay (QOP) by creating an earth fault.
v) Check functioning of all lights.
vi) Check wind-screen wipers and horns.
c) Test under High Tension before and after inspection successively from cab 2 and cab 1.
i) Raising of pantographs.
ii) Working of Auxiliary Compressor motor (MCPA), Amo and Generator (GE), particularly observing behavior during starting and for abnormal noise.
iii) Working of main compressor, charging time of main reservoir from 0 to 10 kg/cm2 and from 8.5 to 10 kg/cm2 with one compressor working. Record rate of leakage in reservoir and brake pipe and brake and feed pipe pressure.
iv) Check up proper functioning of autodrain, HS4, HB5, RS, D1 emergency valve and air flow indicator.
v) Record rate of vacuum leakage and vacuum on test plate and dummy.
vi) Check up all brake cylinders for leakage from exhaust port and record brake cylinder pressure.
vii) Working of both exhausters for various positions of exhausters isloating switch and driver braking valve.
viii) Working of blowers particularly watching for abnormal noise.
ix) Observation of contactors for abnormal sound and sparking.
x) Observe deviation of main ammeters taking two traction notches in forward and reverse directions.
xi) Test differential (QD), progression and regression relays.
xii) Test electro-valve VEF.
xiii) Measure and record depression in loco with all blowers functioning.
d) Low tension test before and after inspection-
i) Testing of master controller for notch by notch progression and regression and total time for regression.
ii) Test VER
iii) Test working of sanders.
iv) Test working of Exhauster isolating lever (ZPV)
2.4 Clean the cable trenches. Examine for any damage to cable, lugs and repair it. Provide proper cable sheathing and cleats. Measure and record insulation resistance of all HT and LT cables. Tighten all the terminal connections.
2.5 Dismantle bogie, brake riggings and clean the bogie in washing tank. Check up for any crack and weld it as per the instructions laid down by RDSO. Overhaul these equipment and replace all worn out components. Ensure squareness of bogie frame. Overhaul axle box bearings and all wheels should be reprofiled.
2.6 Overhaul all traction gears and check up their P and K values and record them.
2.7 All approved modifications which can be executed in the shed should be carried out.
3. On compaction of IOH, the loco should be subjected to detailed HT and LT testing and should also be given a short trial run before it is declared fit for traffic.
D. Periodical Overhaul (POH)
1. The nominated POH workshop should issue a programme for POH of locos at least six months in advance giving the individual numbers of locos to be called in, each month. The homing shed will then send to the workshop a list of the important points to be specially attended to during POH and the list of modification to be carried out. This will enable the workshop to plan the POH work and arrange for the procurement/ shop manufacture of components required.
2. The loco should be sent on its own power from the homing shed to the workshop under escort and along with its History Book. A complete
