TM 10-3930-669-34 1-18.  MAST AND PIVOT/SHIFT ASSEMBLY. The mast assembly (1) is mounted to the pivot/shift assembly (2) and is capable of a 90 degree pivot to the right.  Two tilt cylinders (3) make it possible to tilt the mast assembly (1) six degrees forward or back.  The frame of the mast assembly (1) is made up of three separate rails:  the inner rail (4), center rail (5), and outer rail (6).  The mast assembly (1) is raised and lowered by the  primary  lift  cylinder  (7)  and  secondary  lift  cylinders  (8)  using  chains  and  anchors  to  synchronize  the movement of the three rails. The pivot/shift assembly (2) allows side-to-side movement of the mast assembly (1) using one cylinder located behind the side shift rod (9).  Additionally, the pivot cylinder (10) can pivot the mast 90 degrees to the right. 1-20