The initial stage of train movement mechanically starts from the traction motors pinion, The pinion is engaged with
the bull gear of wheel assembly .
hence the pinion inserting plays a major role in traction system.

This video shows how the pinion is fixed with the armature shaft of traction motor.

The pinion that has to be inserted with armature shaft is first given to lab test . after the lab test result success.
The pinion and traction motor armature shaft are cleaned with the orion 77 . clean dry cloth is used to finally
clean .
smooth silicon paper and smooth presition file are used to level the surface in the pinion extraction hole.

Student dark blue oil colour is used to check the surface matching between pinion
and traction motor armature shaft.
the blue colour is applied evenly to the inner surface of pinion.

the blue colour matching between the armature shaft and pinion has to be above 90 %,

first a marking is made in the pinion with refering the shaft extracting hole as another mark.
if the matching is not enough . another mark is made in pinion.
if the matching is below 85% either traction motor armature or the pinion will be replaced with other.

after the blue matching . the surface of armature shaft with blue is taken with transparent tape for further records.

K value is taken in 8 different areas of pinion to ensure its perfect structure. the sum of 8 different vale
is divided by 8 to get the unique value.

pinion advance is measured in cold condition and hot condition of pinion. the difference from hot to cold gives
the pinion advance value.

The pinion is kept in a oven or induction heater with 170 degree to 190 degree with the sum of atmospheric temperature.

The registered values after the pinion fitment are. traction motor number. armature number. class of locomotive.
pinion make. bull gear ratio.
pinion advance in cold condition of pinion.
pinion advance in hot condition of pinion.
the difference from hot to cold is pinion advance value.
the K value of pinion.




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