Power
Many forklifts are designed to operate on propane gas. Forklifts that utilize propane 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 afterward the vapor mixes with air. The throttle of the forklift is used to control the vapor flow. A spark plug fires up the vapor and air mixture producing pressure that moves the pistons. The pistons turn the wheels and power the hydraulic pump.

Since the kinds of forklifts which are operated by propane have low emissions and are clean burning, they are best to be used inside warehouses and other buildings.

Hydraulics
The hydraulic system of the forklift is what allows it to raise and move really heavy objects from location to location. Cylinders, a pump and tubes 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 raises the forks. When the forks are lowered by the operator, the hydraulic fluid flows out of the cylinders and back into the pump.

Steering
Propane forklifts work well where maneuverability is necessary. Unlike a car, a forklift uses its back wheels to turn, that enables the forklift to rapidly pivot on a tight radius.