Power
There are numerous types of forklifts which are powered by propane gas. Propane-powered forklifts are really easy to refill. The gas is stored inside 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 control the vapor flow. A spark plug fires up the vapor and air mixture creating pressure that moves the pistons. The pistons run the hydraulic pump and turn the wheels.

Forklifts that use propane are recommended for use inside warehouses and other buildings since they are clean burning with low emissions.

Hydraulics
What enables a forklift to raise and move heavy objects from one place to another is the hydraulic system. Cylinders, a pump and tubes make up the hydraulic system. The pump forces dense fluid through the tubing and into the cylinders. The build up of pressure 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.

Steering
Propane forklifts work well where maneuverability is required. Not like an automobile, a forklift makes use of its rear wheels to pivot, that enables the forklift to pivot quickly on a tight radius.