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

one shaft to the other, and maintain the rotors in the correct relationship with each other.
Oil contained in the gear case is distributed by splash to provide lubrication for bearings,
seals and gears.
To the opposite side of the rotor casing is dowelled and bolted on end cover, in which
the rotor shafts are supported by additional journal roller bearings, lubrication for which is provided
from an oil tank attached to the side of the exhauster from which oil is drawn through metering
units, any excess oil passing into the rotor casing and finally being discharged with the exhaust air.
Although timing of the exhaust ports is done by the rotor, the inlet port is arranged to
feed directly into the rotor casing through an opening suitable for adequate size to meet the
requirements of 3" train pipes. An integral filter is directly mounted to the inlet port.
6.4.5 Operating Instructions
Make certain that the exhauster is running in the correct direction of rotation which is
clearly marked by an arrow on the fan housing.
The automatic lubrication system has no means of adjustment and since the oil flow is
vacuum controlled there is no flow at 0"Hg. vacuum, rising to a flow of approximately one to two
drops per minute as the operating vacuum of the exhauster.
The relief valve which is fitted in the system in order to limit the vacuum to that shown on
the name-plate of the exhauster, should be adjusted if necessary to obtain a vacuum of 56/ 57 cm
at 7.9mm diameter leak hole.
Any attempt to operate the exhauster at a higher vacuum will cause overloading of the
motor and the exhauster.
6.4.6 Maintenance Instruction
6.4.6.1 Gear case Lubrication
Oil contained in the gear case provides lubrication for the gears, roller bearings and
seals, and although normally no oil loss should take place, unless there is a leakage from slack
drain plugs, a regular inspection of the oil level should be made when the exhauster is not running
to safeguard against serious troubles arising should the oil level fall for any reason.
It is recommended that after the first 200/250 running hours the gear case be drained by
the removal of one or other of the two drain plugs, and refilled with clean recommended oil to the
correct level.
6.4.6.2 End cover bearing lubrication
This is provided by oil contained in a tank fitted to one side of the exhauster and has
sufficient capacity for approximately 800 hours running. Metering units which are present and
cannot be adjusted any way, supply oil to the bearings and to the working chamber of exhauster,
using the vacuum existing in the latter to provide the necessary pressure difference to cause the