Power
Numerous forklifts are made to run on propane gas. Propane-powered forklifts are really 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 the vapor combines with air. The throttle of the forklift is used to control the flow of vapor. A spark plug ignites the air and vapor mixture producing pressure which moves the pistons. The pistons turn the wheels and power the hydraulic pump.

Since the types of forklifts that are operated by propane are clean burning and have low emissions, they are suitable to be used within warehouses and other buildings.

Hydraulics
What enables a forklift to lift and transport heavy objects from one location to another is the hydraulic system. Tubes, cylinders and a pump make up the hydraulic system. The pump forces dense fluid in the tubing and into the cylinders. The pressure build up 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 into the pump.

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