Power
Many forklifts are designed to run on propane gas. Propane-powered forklifts are easy to refill. The gas is stored in 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 combines with air. The forklift throttle is utilized to control the flow of vapor. A spark plug ignites the vapor and air mixture producing pressure that makes the pistons move. The pistons turn the wheels and power the hydraulic pump.

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

Hydraulics
The forklift's hydraulic system is what allows it to raise and move very 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 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 into the pump.

Steering
Where maneuverability is needed, propane forklifts are the most suitable. Not like an automobile, a forklift uses its rear wheels to pivot, which allows the forklift to rapidly turn on a tight radius.