Page 307 - IRSEM_Main Book

(e) Disconnection Memo on Form No. S&T/DN (Annexure: 3-A10) shall be
given by the SSE/JE (Signal)/incharge, to the Station Master on duty and
his signature shall be obtained before starting the work and reconnection
memo shall be given after the work is completed.

(f) The issue of caution orders and the imposition of speed restriction of 30
KMPH shall remain in force until interlocking frame has been tested by the
authorised official and normal working is restored.

12.25.5 Detailed Instructions for Overhauling

(a) All interlocking frames shall be overhauled under the personal supervision
of the SSE/JE (Signal)/Incharge.

(b) Before taking up the overhauling of a lever frame, the SSE/JE
(Signal)/incharge shall examine the lever frame and collect the necessary
materials to carry out repairs/rectify deficiencies noticed.

(c) Quadrants, Quadrant supports, Levers, Lever shoes, Locking Boxes,
Locking Box supports and Holding down bolts shall be examined to see
that they are rigidly fixed and properly secured. The levers shall be
aligned in straight line in case any misalignment exists. It shall be ensured
that all the parts of the Lever Frame including the spare levers and their
tappets are intact. It shall also be ensured that proper padlocking and
sealing facility exists.

(d) All notches in tappets, locks and the lock rivets shall be examined to
ensure that they have not become unduly worn or slack. False (spare)
notches in tappets shall be filled up or the tappets replaced.

(e) All interlocking bars shall be examined to ensure that they are rigid, truly
straight and not twisted or buckled. Spare holes in interlocking bars shall
be filled up.

(f) All tappets and connecting link pins shall be examined to see that they are
not unduly worn out and do not permit excessive lost motion.

(g) All worn out/cracked parts must be replaced wherever necessary.

(h) The inside of the locking box as also the bars, the tappets and the locks
shall be thoroughly cleaned with a stiff brush and kerosene. Afterwards,
they shall be polished with graphite mixed with thin oil and finally dusted
with graphite.

(i) Each interlocking bar shall be tested before refitting to ensure that the
locking provided through it is correct and the lost motion of the locked
levers or their catch handles is within the permissible limit, i.e. the lever
block cannot be moved more than 12 mm over the lever quadrant in the
case of locking operated directly by the lever. In case of catch handle
operated locking, it shall not be possible to raise the catch handle block
more than 10 mm. Defects, if any, shall be rectified.

Chapter 12: Installation, Testing & Maintenance of Mechanical Signalling Equipment Page 261 of 535