Power
There are many kinds of forklifts that are powered by propane gas. Forklifts that use propane are very 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 utilized to be able to control the vapor flow. A spark plug fires up the vapor and air mixture creating pressure that moves the pistons. The pistons turn the wheels and power the hydraulic pump.

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

Hydraulics
The forklift's hydraulic system is what allows it to lift and move very heavy things from location to location. 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 lifts 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 necessary. Unlike an automobile, a forklift uses its back wheels to turn, that enables the forklift to pivot quickly on a tight radius.