Power
Many forklifts are designed to run on propane gas. Propane-powered forklifts are really 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 the vapor combines with air. The throttle of the forklift is used to be able to control the vapor flow. A spark plug ignites the vapor and air mixture producing pressure which moves the pistons. The pistons run the hydraulic pump and turn the wheels.

Since the kinds of forklifts which are operated by propane have low emissions and are clean burning, they are suitable to be used within warehouses and other buildings.

Hydraulics
What allows a forklift to lift and transport heavy stuff from one place to another is the hydraulic system. Cylinders, a pump and tubes 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 raises the forks. When the operator lowers the forks, the hydraulic fluid flows out of the cylinders and back in the pump.

Steering
Propane forklifts work well where maneuverability is needed. Not like an automobile, a forklift uses its rear wheels to pivot, which allows the forklift to turn fast on a tight radius.