Page 226 - CITS - Fitter Trade Practical - Volume -2

FITTER - CITS

Fig 3 Fig 4

• Slowly tighten the spindle of the puller by a spanner so that the puller is ready to take the strain (Fig 4)
• For dismounting the bearing special type of puller with bracket attachment shown in (Fig 5) is used so that
pulling force is applied on the inner ring of the bearing.
• Use a keeper puller plate along with the puller when pullers legs tend to engage with the outer ring of the
bearing. (Fig 6)

Fig 5 Fig 6

• Rotate the outer ring or the puller during dismounting if the pullers legs has to engage the outer ring of the
bearing, when the bearing is to be used again. (Fig 7)
• Small bearings can be removed by using a puller or with a metallic sleeve using mild hammer blows.
• To dismount small and medium size bearings, use a hammer and a sleeve a butting the lock nut or the inner
ring. (Fig 8)

Fig 7 Fig 8

• Place the sleeve against inner ring if the nut is located inward.

• Use hammer blows for dismounting. (Fig 9)
For all bearings having interference fit in the housing
• Place the wheel on two wooden blocks and fit a suitable sleeve on the face of the bearing. Apply pressure on
the sleeve to drive out the bearing. This type of dismounting can be done for a housing without any shoulder.
(Fig 10)
• Similarly, for a housing with a shoulder between the bearings a soft metal drift is used to strike the bearing in
different positions to drive out. (Fig 11). A suitable puller is also used for dismantling.
• For dismounting self aligning ball bearing, swivel the inner race as shown in Fig 12a. Fit the legs of the puller
on the outer race and tighten the screwed spindle to extract the bearing.

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CITS : C G & M - Fitter - Exercise 92 & 93