Transnet MSoE CP MSOE - Learner Guide - Operating a reach stacker.d | Page 30

Operation and Stability The rated capacity of a counterbalanced reach stacker applies only when the truck is on level ground and the load is at the proper height and distance from the front wheels. It is important that you understand this capacity is reduced and the truck is less stable when: ● the boom is raised ● the boom is extended ● the truck is on an incline Reach stacker stability is dependent on the truck’s three point suspension represented by Figure 3. The truck is supported on the drive axle tires (points A and B) and the centerline of the steer axle pivot (point C). Point D represents the location of the center of gravity of a truck without a load. Point F represents the center of gravity of the load. Point E represents the combined center of gravity of both the empty truck and the load. The combined center of gravity (point E) must remain within the triangle formed by points A, B, and C. Stability depends on how close point E comes to the edge of this triangle. If for any reason this point exceeds the triangle’s boundary, the truck will tip.