Power
Numerous forklifts are made to operate on 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 combines with air. The forklift throttle is utilized to control the flow of vapor. A spark plug ignites the mixture of air and vapor producing pressure which makes the pistons move. The pistons run the hydraulic pump and turn the wheels.

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

Hydraulics
The forklift's hydraulic system is what enables it to raise and move really heavy objects from place to place. Cylinders, a pump and tubes 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 into the pump.

Steering
Where maneuverability is needed, propane forklifts are the most suitable. Unlike a car, a forklift utilizes its back wheels to turn, which allows the forklift to turn quickly on a tight radius.