Power
Many forklifts are designed to run on propane gas. Propane-powered forklifts are very easy to refill. The gas is stored in a pressurized tank on the truck's rear. The propane is pushed into the engine, where it is converted into vapor and the vapor combines with air. The forklift throttle is utilized to be able to control the flow of vapor. A spark plug ignites the vapor and air mixture creating pressure that makes the pistons move. The pistons power the hydraulic pump and turn the wheels.

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

Hydraulics
The forklift's hydraulic system is what enables it to raise and move really heavy things from place to place. 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, 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 needed. Unlike a car, a forklift uses its back wheels to pivot, which enables the forklift to pivot fast on a tight radius.