Abstract: An improved boom support for a walking dragline excavator having a roller circle, a frame mounted on the roller circle for swing movement about the axis of the roller circle, a boom having a pair of boom feet connected to a front end of the frame and proximate to a segment of the roller circle, a hoist line connected to hoist machinery on the frame and passing over a point on the boom, a bucket connected to the hoist line, a dragline interconnecting the bucket and drag machinery on the frame, the front end of the frame having insufficient stiffness for adequately resisting deflection and substantially uniformly distributing the boom weight and hoist load imposed thereon over a segment of the roller circle disposed beneath the front end of the frame, the boom support including an upright structure having an upper end and a pair of legs connected to the frame, the upper end of the upright structure being connected to the pendants and to the frame rearwardly of the leg connections, the leg connections of the upr