Power
Many forklifts are designed to operate on propane gas. Propane-powered forklifts are 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 the vapor mixes with air. The throttle of the forklift is utilized to be able to control the flow of vapor. A spark plug ignites the mixture of vapor and air 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 raise and transport really heavy objects from location to location. Cylinders, a pump and tubes make up the hydraulic system. The pump forces dense fluid in the tubing and into the cylinders. The pressure build up pushes a piston, that 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
Where maneuverability is necessary, propane forklifts are the most suitable. Not like a car, a forklift uses its rear wheels to turn, which allows the forklift to rapidly turn on a tight radius.