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

8.11.4.12 Speedometers- Calibration by comparison with a standard meter.
8.11.4.13 Meters and Gauges- Calibration with standard instruments.
8.11.5 On completion of POH, the loco should be taken over by a representative, of the homing
shed after a joint inspection at the workshop. Details of work done and modifications carried out
should be entered in the History Book which should be returned along with the loco.
8.11.6 Loco will be returned working on its own power and if possible working a train after POH
to the owning Railway.
8.12 REBUILDING AND RECABLING OF LOCOMOTIVES
8.12.1 During every alternate POH, locomotives will need recabling and repiping of vacuum
and pneumatic pipes. POH shops should, therefore, plan these works.
8.12.2 During every 4th POH, mechanical components and traction gear may need rebuilding.
Some of the major components will also need replacement. POH shops should plan for such
works. Opportunity should be taken to upgrade the parts and use the state of art equipment during
such extensive repairs.
8.13 MECHANICAL SCHEDULES OF LOCO
8.13.1 Loco wheel set: Record diameter and profile of individual wheel. Wheel turning is
required when the values are away from permissible limits given in Chapter 4 and below.
Sr. Items to be Periodicity Permissible
No. Inspected clearance tolerance
01. Tyre profile IA, IB, IC
Root wear Y
Flange wear X
6 mm.
3 mm.
kmph.
kmph.
02. Flats on the running All 60 mm for speed < 100
surfaces schedules 40 mm for speed > 100
03. Proud metal at the edge - do - less than 6mm.
8.13.2 Other mechanical items
An important part of the maintenance of the locos is the checking at prescribed intervals
of important mechanical clearance and dimensions which have a bearing on safe and efficient
operation to ensure that they are within prescribed limits. Such measurements should be recorded
suitably either in registers or on printed cards and preserved so as to be readily available for
reference in the PPO at all times. The items to be checked at the interval at which these to be
checked are indicated. Limits will be specified for each type of locomotives by the CEE based on
the manufacturer’s/RDSO's recommendations.
Sr. Items to be Periodicity of