Power
There are many types of forklifts which are operated by propane gas. Forklifts which utilize propane are very 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 flow of vapor. A spark plug ignites the air and vapor mixture producing pressure that moves the pistons. The pistons turn the wheels and power the hydraulic pump.

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

Hydraulics
What allows a forklift to raise and move heavy objects 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 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 in the pump.

Steering
Propane forklifts work well where maneuverability is needed. Not like a car, a forklift uses its rear wheels to pivot, which allows the forklift to rapidly turn on a tight radius.