Power
There are many types of forklifts that are powered by propane gas. Forklifts that use propane are very 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 then the vapor combines with air. The throttle of the forklift is utilized to control the vapor flow. A spark plug ignites the mix of vapor and air creating pressure which makes the pistons move. The pistons power the hydraulic pump and turn the wheels.

Propane powered forklifts are recommended for use in other buildings and warehouses since 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. 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, that lifts the forks. When the forks are lowered by the operator, the hydraulic fluid flows out of the cylinders and back into the pump.

Steering
Propane forklifts work well where maneuverability is required. Unlike a car, a forklift makes use of its rear wheels to pivot, which allows the forklift to rapidly pivot on a tight radius.