Power
Numerous forklifts are designed to run on 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 afterward the vapor mixes with air. The forklift throttle is utilized to control the vapor flow. A spark plug fires up the air and vapor mixture creating pressure that makes the pistons move. The pistons turn the wheels and run the hydraulic pump.

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

Hydraulics
The forklift's hydraulic system is what allows it to raise and move really heavy things 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, which lifts 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 necessary. Unlike a car, a forklift makes use of its rear wheels to turn, which enables the forklift to quickly turn on a tight radius.