Power
There are many kinds of forklifts which are powered by propane gas. Propane-powered forklifts are simple to refill. The gas is stored in a pressurized tank on the back of the truck. The propane is pushed into the engine, where it is converted into vapor and then the vapor combines with air. The forklift throttle is used to be able to control the flow of vapor. A spark plug fires up the air and vapor mixture creating pressure which moves the pistons. The pistons power the hydraulic pump and turn the wheels.

Forklifts that use propane are recommended for use in other buildings and warehouses because they are clean burning with low emissions.

Hydraulics
What enables a forklift to lift and transport heavy objects from one place to another is the hydraulic system. A pump, tubes and cylinders 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 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. Unlike a car, a forklift utilizes its back wheels to pivot, which enables the forklift to turn fast on a tight radius.