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A typical forklift may be generally described as follows:

• The truck proper, which is a motive machine with wheels powered through a transmission and drive train
• An internal-combustion (LPG, gasoline or diesel) engine, or a battery-powered motor
• The counterweight, which is a heavy iron mass attached to the rear of the machine, necessary to compensate for the load. In an electric forklift, the large lead-acid battery itself may serve as a counterweight
• The mast, which is the vertical assembly that does the work of raising, lowering, and tilting the load; the mast is hydraulically operated and consists of a cylinder and interlocking rails for lifting and lowering operations and for lateral stability
• The carriage, which comprises flat metal plate(s) and is moved along the mast by means of chains
• Forks, which are the L-shaped members that engage the load. The back vertical portion of the fork attaches to the carriage by means of a hook or latch; the front horizontal portion is inserted into or under the load. Alternatively, a variety of other equipment is available, including slipsheet clamps, carton clamps, carpet rams, pole handlers, and others.
• The load back rest, which is a rack-like extension attached to the carriage to prevent the load from shifting backward
• The driver's overhead guard, which is a metal roof, supported by posts, that helps protect the operator from any falling debris
• The cab, with a seat for the operator and pedals and switchThis article is about electrical switches. For other meanings of the word "switch", see Switch (disambiguation). A switch is a device for making or breaking an electric circuit, or for selecting between multiple circuits. In the simplest case, a switch haes for controlling the machine—the cab is typically open and bounded by the cage-like overhead guard assembly.

1 Control and capability

Forklift trucks are available in many variations and load capacities. In a typical warehouse setting most forklifts used have load capacities of around one to five tons.

In addition to a control to raise and lower the forks (also known as blades or tines), the operator can tilt the mast to compensate for a load's tendency to angle the blades toward the ground and risk slipping off the forks. Tilt also provides a limited ability to operate on non-level ground. Some machines also allow the operator to move the tines and backrest laterally, allowing easier placement of a load. In addition, a few machines offer a hydraulic control to move the tines together or apart, removing the need for the operator to get out of the cab to manually adjust for a differently sized load.

Grab attachments for handling barrels or even kegs also have a control to operate the tongs that grab the load.

2 Forklift safety

Forklifts are rated for loads at a specified maximum weight and a specified forward center of gravityIn physics, the center of gravity (CoG of an object is the average location of its weight. In a uniform gravitational field, it coincides with the object's center of mass. In modern Britain the spelling centre is standard. Both spellings originated in Eng. This information is located on a nameplate provided by the manufacturer, and loads must not exceed these specifications.

An important aspect of forklift operation is its rear-wheel steering. While this increases maneuverability in tight cornering situations, it differs from a driver’s traditional experience with other wheeled vehicles as there is no castorIn Greek mythology, Castor was one of the twin sons of Leda and the brothers of Helen of Troy and Clytemnestra: see Castor and Polydeuces. Castor (α Geminorum) is also a star, named after the character from Greek mythology. Castor is sometimes used action , indeed it is necessary to apply steering force to maintain a straight ahead course. These effects are observable when driving a car or other vehicle in reverse.

Another critical characteristic of the forklift is its instability; the forklift and load must be considered a unit, with a continually varying center of gravity with every movement of the load. A forklift must never negotiate a turn at speed with a raised load, where centrifugalIn classical mechanics, centrifugal force is the experience of the inertia of an object moving in circular motion, causing it to move away from the center. It is often designated a " fictitious force". We know from Newton's first law of motion that a body and gravitationalThis article covers the physics of gravitation. See also gravity (disambiguation). Gravitation is the tendency of masses to move toward each other. The first mathematical formulation of the theory of gravitation was made by Sir Isaac Newton and proved ast forces may combine to cause a disastrous tipover accident. A forklift must not be used as a personnel elevator without the fitting of specific safety equipment. In the U.S., additional safety considerations are detailed in the applicable OSHA rules, and lift truck operators must be trained and certified.