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 truck's back. 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 vapor and air mixture producing pressure that makes the pistons move. The pistons turn the wheels and run the hydraulic pump.

Propane powered forklifts are recommended for use inside other buildings and warehouses because they are clean burning with low emissions.

Hydraulics
The forklift's hydraulic system is what enables it to raise and move very heavy things from location to location. A pump, tubes and cylinders 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 into the pump.

Steering
Where maneuverability is required, propane forklifts are the most suitable. Unlike a car, a forklift utilizes its rear wheels to turn, which enables the forklift to quickly pivot on a tight radius.