Power
There are numerous kinds of forklifts which are operated by propane gas. Forklifts which use propane are very easy to refill. The gas is stored in a pressurized tank on the truck's back. The propane is pushed into the engine, where it is converted into vapor and the vapor mixes with air. The forklift throttle is used to control the vapor flow. A spark plug fires up the vapor and air mixture creating pressure that moves the pistons. The pistons turn the wheels and run the hydraulic pump.

As the types of forklifts that are operated by propane have low emissions and are clean burning, they are best to be utilized in warehouses and other buildings.

Hydraulics
The hydraulic system of the forklift is what allows it to lift and move really heavy things from place to place. A pump, tubes and cylinders 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 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 required. Unlike an automobile, a forklift uses its rear wheels to pivot, that enables the forklift to pivot quickly on a tight radius.