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 truck's rear. The propane is pushed into the engine, where it is converted into vapor and the vapor mixes with air. The forklift throttle is utilized to control the flow of vapor. A spark plug ignites the mix of air and vapor creating pressure which makes the pistons move. The pistons power the hydraulic pump and turn the wheels.

Since the types of forklifts that are operated by propane are clean burning and have low emissions, they are best to be utilized within other buildings and warehouses.

Hydraulics
What allows a forklift to lift and move heavy things from one location to another is the hydraulic system. A pump, tubes and cylinders make up the hydraulic system. The pump forces dense fluid in the tubing and into the cylinders. The build up of pressure pushes a piston, that lifts the forks. When the forks are lowered by the operator, the hydraulic fluid flows out of the cylinders and back into the pump.

Steering
Where maneuverability is necessary, propane forklifts are the most suitable. Unlike an automobile, a forklift utilizes its back wheels to pivot, that allows the forklift to pivot fast on a tight radius.