Power
There are many kinds of forklifts that are operated by propane gas. Forklifts that utilize propane are very 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 then the vapor mixes with air. The forklift throttle is used to control the flow of vapor. A spark plug fires up the mix of vapor and air producing pressure which moves the pistons. The pistons turn the wheels and power the hydraulic pump.

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

Hydraulics
The hydraulic system of the forklift is what allows it to lift and transport really heavy objects from place to place. Tubes, cylinders and a pump 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 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. Not like a car, a forklift utilizes its back wheels to turn, that enables the forklift to rapidly pivot on a tight radius.