Power
There are numerous kinds of forklifts which are operated by propane gas. Propane-powered forklifts are very 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 then the vapor mixes with air. The throttle of the forklift is utilized to be able to control the vapor flow. A spark plug fires up the mix of air and vapor creating pressure which moves the pistons. The pistons power the hydraulic pump and turn the wheels.

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

Hydraulics
The forklift's hydraulic system is what allows it to raise and transport really heavy things from location to location. A pump, tubes and cylinders make up the hydraulic system. The pump forces dense fluid in 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 into the pump.

Steering
Where maneuverability is needed, propane forklifts are the most suitable. Not like a car, a forklift makes use of its back wheels to turn, which allows the forklift to turn quickly on a tight radius.