Power
There are numerous types of forklifts that are powered by propane gas. Propane-powered forklifts are simple to refill. The gas is stored inside a pressurized tank on the rear of the truck. 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 be able to control the vapor flow. A spark plug ignites the vapor and air mixture producing pressure which moves the pistons. The pistons power the hydraulic pump and turn the wheels.

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

Hydraulics
The forklift's hydraulic system is what allows it to lift and move really heavy stuff from location to location. 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 raises the forks. When the operator lowers the forks, the hydraulic fluid flows out of the cylinders and back in the pump.

Steering
Where maneuverability is needed, propane forklifts are the most suitable. Unlike an automobile, a forklift makes use of its rear wheels to turn, that allows the forklift to rapidly turn on a tight radius.