Power
Many forklifts are designed to run on propane gas. Propane-powered forklifts are really easy to refill. The gas is stored in 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 be able to control the flow of vapor. A spark plug fires up the mix of air and vapor producing pressure which makes the pistons move. The pistons turn the wheels and run the hydraulic pump.

Because the types of forklifts that are powered by propane have low emissions and are clean burning, they are suitable to be used in warehouses and other buildings.

Hydraulics
The forklift's hydraulic system is what enables it to lift and transport really heavy stuff from place to place. Cylinders, a pump and tubes make up the hydraulic system. The pump forces dense fluid through the tubing and into the cylinders. The pressure build up pushes a piston, that lifts the forks. When the operator lowers the forks, the hydraulic fluid flows out of the cylinders and back into the pump.

Steering
Propane forklifts work well where maneuverability is required. Unlike an automobile, a forklift uses its rear wheels to pivot, which enables the forklift to quickly turn on a tight radius.