Power
There are many kinds of forklifts that are powered by propane gas. Propane-powered forklifts are very 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 then the vapor combines with air. The forklift throttle is utilized to control the vapor flow. A spark plug ignites the air and vapor mixture producing pressure that moves the pistons. The pistons turn the wheels and run the hydraulic pump.
Because the kinds of forklifts that are powered by propane are clean burning and have low emissions, they are best to be used inside warehouses and other buildings.
Hydraulics
The forklift's hydraulic system is what allows it to lift and move very heavy objects 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 pressure build up pushes a piston, that lifts 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 uses its rear wheels to pivot, that allows the forklift to rapidly turn on a tight radius.