Power
There are numerous types of forklifts that are powered by propane gas. Forklifts which use propane are very simple to refill. The gas is stored in 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 mixes with air. The throttle of the forklift is used 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 power the hydraulic pump.

Forklifts that utilize propane are suggested for use in warehouses and other buildings because they are clean burning with low emissions.

Hydraulics
What allows a forklift to raise and transport heavy things from one location 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 build up of pressure 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 makes use of its rear wheels to turn, which allows the forklift to rapidly turn on a tight radius.