Power
There are numerous kinds of forklifts which are powered by 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 then the vapor mixes with air. The throttle of the forklift is used to control the flow of vapor. A spark plug ignites the vapor and air mixture producing pressure that moves the pistons. The pistons turn the wheels and power the hydraulic pump.

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

Hydraulics
The hydraulic system of the forklift is what enables it to raise and transport very heavy things 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 pressure build up pushes a piston, that lifts 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 required. Unlike an automobile, a forklift uses its rear wheels to turn, that allows the forklift to rapidly pivot on a tight radius.