Power
There are many types of forklifts that are operated by propane gas. Propane-powered forklifts are easy to refill. The gas is stored inside 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 air and vapor mixture creating pressure that makes the pistons move. The pistons run the hydraulic pump and turn the wheels.

Since the types of forklifts which are powered by propane are clean burning and have low emissions, they are best to be utilized inside other buildings and warehouses.

Hydraulics
The forklift's hydraulic system is what enables it to lift and move really heavy things from place to place. 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 raises the forks. When the forks are lowered by the operator, 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 an automobile, a forklift makes use of its rear wheels to pivot, that enables the forklift to quickly turn on a tight radius.