Power
Many forklifts are designed to operate on propane gas. Propane-powered forklifts are very simple 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 then 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 creating pressure which moves the pistons. The pistons power the hydraulic pump and turn the wheels.
Forklifts that utilize propane are suggested 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 really heavy objects from place to place. Tubes, cylinders and a pump make up the hydraulic system. The pump forces dense fluid in the tubing and into the cylinders. The pressure build up pushes a piston, which lifts the forks. When the operator lowers the forks, the hydraulic fluid flows out of the cylinders and back into the pump.
Steering
Propane forklifts work well where maneuverability is needed. Not like an automobile, a forklift makes use of its back wheels to pivot, which allows the forklift to quickly pivot on a tight radius.