Power
There are many types of forklifts which are powered 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 combines with air. The throttle of the forklift is used to be able to control the vapor flow. A spark plug fires up the mixture of vapor and air producing pressure which makes the pistons move. The pistons turn the wheels and power the hydraulic pump.

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

Hydraulics
What allows a forklift to lift and move 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 build up of pressure 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
Propane forklifts work well where maneuverability is required. Unlike a car, a forklift utilizes its back wheels to pivot, which allows the forklift to rapidly pivot on a tight radius.