Power
Numerous forklifts are made to run on propane gas. Forklifts which use propane are really easy to refill. The gas is stored inside a pressurized tank on the truck's back. The propane is pushed into the engine, where it is converted into vapor and afterward the vapor combines with air. The forklift throttle is used to control the flow of vapor. A spark plug ignites the air and vapor mixture creating pressure that makes the pistons move. The pistons turn the wheels and power the hydraulic pump.

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

Hydraulics
What enables a forklift to lift and move heavy things from one location to another is the hydraulic system. Tubes, cylinders and a pump 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 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 needed. Unlike an automobile, a forklift makes use of its rear wheels to pivot, which allows the forklift to quickly turn on a tight radius.