Traction Rolling Stock - Indian Railways Institute of Electrical ...

) Check capacitor of headlight stabilizer,
c) Check transformer and tap changer oil for di-electric strength and acidity.
Recondition/ replace, if necessary.
d) Check the switch angle of SMGR.
e) Overhaul SMGR.
f) Lubricate all electro-pneumatic contactors.
g) Check Q factor of electro-pneumatic contactors.
h) Inspect dynamic braking resistor for damage. Overhaul and record resistance.
Section E3
Carry out the following:
a) Lubricate Arno bearings, measure and record insulation resistance values.
b) Overhaul brush holder insulators.
c) Overhaul auxiliary machines.
Section E4
a) Overhaul and calibrate main power circuit overload relay (QLM), silicon rectifier
overload relay (QRSI), electric braking overload relay (QF), braking excitation
overload relay (QE), power circuit earth fault relay (QOP), auxiliary circuit earth
fault relay (QOA) and No-volt relay (Q30).
b) Overhaul and test Q118, Q44, QTD and Q 48.
c) Overhaul and test SMGR relays (Q51, Q52), QD and Q20.
d) Overhaul speedometer.
8.10 INTERMEDIATE OVERHAUL (IOH)
8.10.1. IOH of locos may be done at the homing shed itself or at a workshop nominated for the
purpose.
8.10.2. During IOH, in addition to a thorough inspection of all mechanical and electrical items as
detailed under IA, IB, IC and AOH, squaring of bogies should be done and traction motors,
rectifiers, auxiliary machines, blowers, tap changer, pantograph etc. should be taken off the loco
and overhauled. Transformer oil should be filtered and replaced if acidity is beyond the permissible
limits. All wheels should be re-profiled. Insulation resistance of all HT and LT circuits should, be
measured and recorded. Approved modifications, which can be executed in the shed, should be
carried out.