Power
There are numerous types of forklifts which are powered by propane gas. Propane-powered forklifts are very easy to refill. The gas is stored inside 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 mixes with air. The forklift throttle is used to be able to control the vapor flow. A spark plug fires up the vapor and air mixture creating pressure which makes the pistons move. The pistons turn the wheels and power the hydraulic pump.

Propane powered forklifts are recommended for use inside warehouses and other buildings because they are clean burning with low emissions.

Hydraulics
The hydraulic system of the forklift is what allows it to lift and transport really heavy objects from location to location. Tubes, cylinders and a pump 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 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. Not like a car, a forklift uses its rear wheels to turn, that allows the forklift to turn fast on a tight radius.