Power
There are many types of forklifts that are operated by propane gas. Propane-powered forklifts are really easy to refill. The gas is stored in a pressurized tank on the rear of the truck. 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 vapor flow. A spark plug fires up the mixture of air and vapor producing pressure that moves the pistons. The pistons turn the wheels and power the hydraulic pump.

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

Hydraulics
The hydraulic system of the forklift is what enables it to lift and transport really heavy objects from place to place. A pump, tubes and cylinders 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 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. Not like an automobile, a forklift uses its back wheels to pivot, that enables the forklift to pivot quickly on a tight radius.