There are many types of forklifts that are operated by 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 control the vapor flow. A spark plug fires up the air and vapor mixture producing pressure which moves the pistons. The pistons run the hydraulic pump and turn the wheels.
Because the kinds of forklifts which are powered by propane are clean burning and have low emissions, they are best to be used in other buildings and warehouses.
What allows a forklift to lift and move heavy objects from one location to another is the hydraulic system. A pump, tubes and cylinders make up the hydraulic system. The pump forces dense fluid through the tubing and into the cylinders. The pressure build up 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.
Where maneuverability is necessary, propane forklifts are the most suitable. Unlike a car, a forklift utilizes its back wheels to pivot, which allows the forklift to turn fast on a tight radius.