Power
There are many types of forklifts which are operated by propane gas. Forklifts that use propane are simple 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 then the vapor combines with air. The throttle of the forklift is used to control the vapor flow. A spark plug fires up the vapor and air mixture producing pressure that makes the pistons move. The pistons power the hydraulic pump and turn the wheels.

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

Hydraulics
What allows a forklift to raise and move heavy stuff from one location to another is the hydraulic system. A pump, tubes and cylinders make up the hydraulic system. The pump forces dense fluid in the tubing and into the cylinders. The pressure build up pushes a piston, that raises the forks. When the operator lowers the forks, the hydraulic fluid flows out of the cylinders and back into the pump.

Steering
Where maneuverability is needed, propane forklifts are the most suitable. Unlike an automobile, a forklift makes use of its rear wheels to pivot, which allows the forklift to quickly pivot on a tight radius.