Power
There are many kinds of forklifts which are operated by propane gas. Forklifts which use propane are 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 mixes with air. The throttle of the forklift is utilized to control the flow of vapor. A spark plug fires up the mixture of air and vapor creating pressure which moves the pistons. The pistons power the hydraulic pump and turn the wheels.

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

Hydraulics
What enables a forklift to raise and transport heavy things from one place to another is the hydraulic system. 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
Where maneuverability is needed, propane forklifts are the most suitable. Not like a car, a forklift uses its back wheels to pivot, which enables the forklift to pivot fast on a tight radius.