Power
There are many types of forklifts which are operated by propane gas. Propane-powered forklifts are very easy 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 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 mix of air and vapor producing pressure which makes the pistons move. The pistons run the hydraulic pump and turn the wheels.

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

Hydraulics
What allows a forklift to raise and transport heavy stuff from one location 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, that raises 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. Unlike an automobile, a forklift utilizes its rear wheels to turn, that enables the forklift to pivot quickly on a tight radius.