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

f) Inspect all resistance, including R 118 and braking resistances.
g) Check all terminal boards.
h) Test the manual control of tap changer servo-motor (SMGR), lubricate the level
bars.
i) Check the insulation values of transformer windings to earth.
j) Check the springs of reverser and CTF and replace if necessary, verify the
pressure on main contacts, clean the servo motor, check the operation of main
and auxiliary contacts, check the rubber buckets.
k) Lubricate contacts and the articulation points of Ll, L2, C 145 and shunting
contactors and check rubber buckets.
l) Inspect SJ and SL for any abnormality and clean.
m) Inspect braking electro valves, Pantograph electro valves and sanding electro
valves VEF, VEPT, VESA and VER.
Section E3
In addition to items under IA and IB
a) Measure and record the insulation resistance of traction motor winding.
b) Check visually for top circulating ring of rotor and its top position of rotor bar
cracks in Arno and lubricate bearings.
c) Check and clean the commutator and brush box auxiliary compressor motor.
Section E4
Carry out the following :
a) Remove main contacts check wear of fixed and moving contacts. Replace if
necessary.
b) Check and adjust the gaps of lighting arresters.
c) Check and clean the contacts of high tension overload relay (QLM), Smoothing
rectifier circuit overload relay (QRSI), electric braking relay (QF), braking exciter
overload relay (QE), auxiliary circuit earth fault relay (QOA), no voltage relay
(Q30). Check proper alignment and bedding of contacts.
d) Check collector comb, dropping resistance and multi-core cable. Replace carbon
brush if necessary,
e) Clean and check operation of tap changer servo-motor (SMGR) relays and
slipping device differential relay (QD), traction motor over voltage relay (Q20).
8.9. ANNUAL OVERHAUL (AOH)
These are in addition to the items listed under IA, IB and IC.