Power
Numerous forklifts are designed to operate on propane gas. Forklifts which use propane are easy to refill. The gas is stored in a pressurized tank on the truck's rear. The propane is pushed into the engine, where it is converted into vapor and the vapor mixes with air. The throttle of the forklift is used to control the flow of vapor. A spark plug ignites the air and vapor mixture producing pressure that moves the pistons. The pistons turn the wheels and power the hydraulic pump.

As the types of forklifts that are operated by propane have low emissions and are clean burning, they are best to be utilized inside other buildings and warehouses.

Hydraulics
The hydraulic system of the forklift is what allows it to lift and transport very heavy stuff from location to location. Tubes, cylinders and a pump 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 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. Not like a car, a forklift makes use of its back wheels to turn, that enables the forklift to pivot quickly on a tight radius.