Power
Numerous forklifts are designed to operate 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 forklift throttle is used to control the vapor flow. A spark plug fires up the mix of air and vapor creating pressure that moves the pistons. The pistons turn the wheels and run the hydraulic pump.

Forklifts that utilize propane are suggested 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 objects from one place to another is the hydraulic system. Cylinders, a pump and tubes 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, which raises the forks. When the forks are lowered by the operator, the hydraulic fluid flows out of the cylinders and back into the pump.

Steering
Propane forklifts work well where maneuverability is needed. Unlike an automobile, a forklift makes use of its back wheels to turn, which enables the forklift to turn quickly on a tight radius.