Power
There are numerous kinds of forklifts that are powered by propane gas. Propane-powered forklifts are 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 afterward the vapor combines with air. The forklift throttle is used to be able to control the vapor flow. A spark plug fires up the mix of vapor and air producing pressure that makes the pistons move. The pistons run the hydraulic pump and turn the wheels.

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

Hydraulics
What enables a forklift to lift and move 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 in the tubing and into the cylinders. The pressure build up 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 necessary. Unlike an automobile, a forklift uses its back wheels to pivot, that enables the forklift to pivot quickly on a tight radius.