unstable soil. Earth material that, because of its nature or the influence of related conditions, cannot be depended upon to remain in place without extra support, such as would be furnished by a system of shoring.
There are many areas to focus on when performing forklift maintenance. The gas engine or electric motor, the hydraulic system and the tires are frequently involved in specialized forklift maintenance programs. In many locations, it is required that all forklift maintenance and repair be completed by a trained and certified mechanic, such as those certified with the Occupational Safety and Health Administration or OSHA in the United States.
Considerations include forklift type, capacity, carriage type, and number of hydraulic functions (that power the attachment features). As mentioned in the preceding section, replacing or adding an attachment may reduce (down-rate) the safe lifting capacity of the forklift truck (See also General operations, below).