BOGIES AND SUSPENSION - South Central Railway

CHAPTER 6 – BOGIES AND SUSPENSION
WAGON MAINTENANCE MANUAL
Page 89 of 121
substances, un-spun yarn, colored threads, rags, etc. The dry cotton waste must
always be stored in a suitable clean and dry room free from damp and dust
contamination.
Preparation of soaked waste required for the roll packing must be carried out
with great care. The soaking of waste is, by and large, at present being carried out in
the conventional method though a few railways have switched over to the steam
vacuum process which gives a superior product in a such shorter period of time. The
required quantity of dry waste should be weighed.
Foreign matter should then be carefully hand picked and the waste placed on
an expanded metal table and then beaten with a cane. The weighed quantity of cotton
waste should then be placed on an adjustable perforated tray in a suitable size
rectangular tank. The tray should be lowered to the bottom position.
A measured or weighed quantity of medium axle oil, about six times the
weight of the cotton should then be poured over the waste. It should be ensured that
the waste is fully submerged in oil during the period of 36 hours for which it is to be
soaked. The waste should be turned over, every four to six hours during the period of
soaking.
The perforated tray should be lifted after 36 hours of soaking. Draining
should then be permitted for a period of 12 hours in winter and 6 hours in summer.
There should be a small black plate or board on each soaking tank for writing with
chalk, the timings of commencement and termination of the soaking and the draining
operations. The quantity of oil at the bottom of the tank after the draining period,
should occasionally be measured with a dip stick to ensure that the drained soaked
waste has oil and waste in the proportion of 4.1. The above waste should then, be
transferred to a large rectangular but very shallow (250 to 400 mm deep) container.
The packing so placed should also be turned over, three to four times in a day, to
ensure uniformity of oil and waste proportions.
Dirty, wet and glazed portions of old packing should not be reclaimed, and the
back rolls must invariably be discarded. The serviceable portion should then be
thoroughly shaken on expanded metal table and also teased by hand. The old waste
cleaned in the above manner should then be soaked and drained in a separate tank,
which also has a perforated tray. The soaking period for the old waste should be 6
hours only and thereafter, the draining should be for 12 hours in winter and 6 hours
during the summer months.
The reclaimed waste so prepared should be transferred a separate shallow
container where it should be turned over 3 to 4 times in a day to ensure uniformity of
oil and waste proportion. For roll making, the reclaimed and new waste may not be
mixed, as far as possible, should be made of re-claimed waste is not available, the
mixture of the reclaimed and the new waste in the proportion of 2:1 may be used. It
must be remembered that while the maximum amount of old packing must be reclaimed,
there should be no compromise in the matter of re-claimation of such old
waste as is definitely unfit for further use.