Power
There are many types of forklifts which are powered by propane gas. Propane-powered forklifts are simple to refill. The gas is stored inside 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 throttle of the forklift is utilized to be able to control the vapor flow. A spark plug fires up the mixture of air and vapor producing pressure which moves the pistons. The pistons power the hydraulic pump and turn the wheels.

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

Hydraulics
What enables a forklift to raise and transport heavy stuff from one location 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 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 into the pump.

Steering
Propane forklifts work well where maneuverability is needed. Unlike an automobile, a forklift utilizes its rear wheels to turn, that enables the forklift to turn fast on a tight radius.