The moment of the load changes as its location forward of the fulcrum changes. Its
location is dependent upon the boom angle, and the extended length, of the boom.
The operator must control these variables and ensure that the total weight forward of
the fulcrum multiplied by the location of the combined center of gravity plus the other
dynamic forces of operation never exceed the counterbalance of the reach stacker.
Following these safety rules and using good, common-sense judgement will help ensure
safe operation of the reach stacker.
Reach stackers are designed to keep everything in proper balance; many different
factors affect this balance: – capacity of the machine (at a specified load center) –
weight of the load and its center of gravity – position of the load on the attachment –
type and weight of the attachment – acceleration or braking – condition of the ground
surface and grade angle – lift and extension of the boom – weather conditions The
operator must consider these factors before operating the machine. Each of these
factors can affect safe operation of the machine. The balance for proper operation is
safe if all different parts of the machine are properly maintained AND you safely
operate the machine, the operator. For example, the rated capacity of a machine is set
for a special combination of the machine, boom, and attachment. If the attachment or
boom is changed, the capacity may change. You must know what the actual changes
are and what the actual capacity is. (See Appendix A, paragraph a.4.)