American Forge & Foundry long chassis service jacks provide easy access to difficult-to-reach load points and are equipped with a high-speed air motor for fast and efficient lifting. Applications include bus and truck fleets, agriculture, and industrial sectors. All air-assisted service jacks can be operated manually when shop air is not available. Constructed with heavy gauge steel and robust welds to provide maximum strength and durability. Heavy-duty pumps, rams, and cylinders are precision machined and inspected to ensure long service life and superior performance. Handle-actuated release valve provides metered control at any desired lowering speed. Automatic overload safety valve provides added operator safety.