UPPERSTRUCTURE / Main Frame 6. Remove bolts (3) (29 used) and (4) (7 used) from the outer race of swing bearing. 7. Adjust the wire rope length by using a chain block (6) in order to make the counterweight horizontal. Hoist and remove the main frame from the track frame. W1JB-02-03-002 3,4 6 W157-02-03-002 Track Frame W2-3-3 Main Fr ame