As the inner rails rise, the chair wheel turns-operating like a pulley-causing the chains to rise also and lift the carriage. The other end of the chains is bolted to the inner rails. The length then travels around a chain wheel. One end of the mast chains is anchored to the carriage. When the inner rails begin to move, it’s the mast chains that lift the forklift carriage. Instead, it attaches to a mount located between the mast’s rails. The forklift carriage is not actually part of the mast. Forklift carriageĮvery component used to secure a load connects to the forklift carriage, including the forks, load backrest and any accessories. Every forklift has two stationary outer rails and at least one set of inner rails (or channels) that move up and down. The rails are the most noticeable mast of forklift feature because they form the structure, or frame, of the mast. While the job of a forklift mast-raising and lowering cargo-is relatively straightforward, successfully achieving the task requires several complex components working in unison. While the forks support the cargo, it’s the mast that does all the heavy lifting. Quad uprights work basically in the same way as triple stage uprights except in that a second set of chains and pulleys operated by the secondary lift cylinders provide the fourth stage of lift.When searching for the right lift truck for your operation, the forklift mast is an essential consideration.Ī forklift mast, also known as an upright, is the vertical component that controls the raising, lowering and tilting of a load. The quad upright uses four sets of rails and an added set of chains to provide four stages of lift with full free lift. When these cylinders begin lift, they lift the intermediate rails directly while the chains pull the inner set of rails along with the carriage/fork assembly. The secondary lift cylinders are attached to the intermediate rails. ![]() The primary cylinder provides the full free lift of the carriage and forks. The same principles of operation apply in triple-stage lift as the hi-lo model but with an extra stage of lift. The triple stage upright uses three sets of rails, two movable rails and one stationary rail for three stage lift with full free lift. Triple Stage Upright (Triplex, Triple, TSU, FSV Mast) The primary cylinder also raises the carriage at a 2-to-1 ratio, but raises the carriage to the top of the inner rails before hydraulic fluid is rerouted to the side-mounted secondary cylinders for direct rail lift. This upright resembles the standard upright and works in the same way, except a primary, center-mounted cylinder provides full free lift. ![]() The duplex upright is a two-stage assembly with full free lift. Duplex Upright (Full Free Lift, FFL, Hi-Lo, FV Mast) The chain raises the carriage at a rate of two inches for every inch of cylinder rod extension. This upright uses two side-mounted lift cylinders to provide direct lift to the inner rails and indirect chain lift to the carriage/fork assembly. The standard upright is a two-stage assembly with two rails, one stationary and one movable inner rail. 4 Types of Forklift Masts Standard Upright (Simplex, V Mast) Below ProLift has defined the four basic types of uprights and masts: standard, duplex, triple stage and quad. Understanding the types of masts available and what each can do is helpful for selection. ![]() This may be a question posed to you during your next forklift purchase. ![]() What type of mast do you need for your forklift? Our equipment specialists can help you answer those questions. Before selection, determine what you need from a forklift mast.
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