Power
There are numerous types of forklifts that are operated by propane gas. Propane-powered forklifts are really simple to refill. The gas is stored inside a pressurized tank on the truck's rear. The propane is pushed into the engine, where it is converted into vapor and the vapor combines with air. The forklift throttle is utilized to control the flow of vapor. A spark plug ignites the mix of air and vapor creating pressure that makes the pistons move. The pistons run the hydraulic pump and turn the wheels.

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

Hydraulics
The hydraulic system of the forklift is what enables it to lift and move very heavy things from place to place. 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, that lifts the forks. When the forks are lowered by the operator, the hydraulic fluid flows out of the cylinders and back in the pump.

Steering
Propane forklifts work well where maneuverability is necessary. Unlike an automobile, a forklift uses its rear wheels to turn, which enables the forklift to quickly turn on a tight radius.