Page 72 - CITS - Fitter Trade Practical - Volume -2

FITTER - CITS

• Position the centre screw of the puller by hand screwing, so that, sufficient centre screw length is available for
complete removal of the pulley from the shaft.

• Apply few drops of oil, around the shaft before removing.
• Tighten the centre screw gradually using correct size spanner and check whether the pulley is coming out
freely from the shaft, if not slightly hammer on the head of the centre screw, this will cause the pulley to come
out from the shaft freely.(Fig 2)

Fig 2

Note : For removing pulley from smaller shaft use Arbor press.
Note :For removing pulley from longer shaft or from the shaft attached to the machine. Use proper
puller.
Extract pulley using Arbor press

• Clean the end of the shaft with flat file to remove any burrs or bulging from the end of the shaft.
• Set the Arbor press according to the shaft it should be less than the diameter of the shaft.
• Select the mandrel according to the shaft it should be less than the diameter of the shaft.
• Select a pair of parallel blocks and position them on the bed of the press.

• Place the pulley with shaft on the parallel blocks, such that the shaft in the pulley is in line with the ram of the
press. Ensure that the parallel blocks are as close as to the shaft to give maximum support.
• Apply few drops at oil around the shaft to reduce friction during removal.

• Position the mandrel on the shaft and position the ram of the press on the mandrel (Fig 3).

Fig 3

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CITS : C G & M - Fitter - Exercise 65