Power
There are many types of forklifts which are operated by propane gas. Forklifts that utilize propane are very easy to refill. The gas is stored in a pressurized tank on the back of the truck. The propane is pushed into the engine, where it is converted into vapor and the vapor combines with air. The forklift throttle is used to be able to control the flow of vapor. A spark plug fires up the vapor and air mixture producing pressure that makes the pistons move. The pistons power the hydraulic pump and turn the wheels.
Forklifts that use propane are recommended for use within other buildings and warehouses because they are clean burning with low emissions.
Hydraulics
The hydraulic system of the forklift is what allows it to lift and transport really heavy stuff 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 pressure build up pushes a piston, that 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 needed. Not like a car, a forklift utilizes its rear wheels to pivot, which enables the forklift to quickly pivot on a tight radius.