Power
Many forklifts are made to run on propane gas. Propane-powered forklifts are very easy to refill. The gas is stored inside a pressurized tank on the back of the truck. The propane is pushed into the engine, where it is converted into vapor and then the vapor mixes with air. The throttle of the forklift is utilized to control the flow of vapor. A spark plug fires up the mixture of air and vapor creating pressure that moves the pistons. The pistons turn the wheels and power the hydraulic pump.

Forklifts that use propane are recommended for use within other buildings and warehouses since they are clean burning with low emissions.

Hydraulics
What allows a forklift to lift and move heavy things from one place to another is the hydraulic system. Cylinders, a pump and tubes make up the hydraulic system. The pump forces dense fluid through the tubing and into the cylinders. The build up of pressure pushes a piston, which raises the forks. When the operator lowers the forks, the hydraulic fluid flows out of the cylinders and back in the pump.

Steering
Propane forklifts work well where maneuverability is necessary. Unlike a car, a forklift utilizes its rear wheels to pivot, which enables the forklift to turn fast on a tight radius.