Case Study #05Boom sheaves replacement – pylon - CQB

1. Slack & secure boom wire ropes.

2. Dismantle shaft.

3. Dismantle all sheaves “3 sheaves”.

4.Assemby of new sheaves and new sleeves.

4.1 Fabricate a special frame to assembly new

sheaves.

5.Assemby of new sheaves in its place.

6.Assemby of new shaft.

7. Assembly of end sleeve and end plate 8. Assembly stopper plates and lubrication

Note:During assembly process, we found the precession and tolerance between the new sleeves and the new shaft not matching, so we machining the sleeves from inside at an external work shop to get the design and allowable precession required.