UPPERSTRUCTURE / Main Frame 6. The mounting angle of swing bearing is specified. (Refer to W3-1.) Put the matching marks on the upperstructure and the outer race of swing bearing. Remove bolt (7) from the swing bearing. : 41 mm 7. Adjust chain block (6) in order to level the main frame. Hoist and remove the main frame from the undercarriage. 7 W105-02-03-007 6 W157-02-03-002 W2-3-4