Carriage bearings – these provide lateral guidance to the fork carriage as it travels up the mast.They also attach the fork carriage to the mast rails. Mast guide bearings – these bearings guide the mast stages up as the forks are raised beyond the first stage.There are four main types of Mast Bearings:
They carry the forks (carriage) up the mast and they also enable the various stages of the mast to extend. Mast bearings are found on fork lift trucks. FORK TRUCK MAST BEARINGS: A guide to Identification & Terminology the internal construction of Mast Guide bearings resists misalignment of the outer ring.Īll Mast Guide and Chain Sheave bearings are sealed and factory lubricated with water-resistant grease to prevent contamination of the balls, rollers, and raceways. In conjunction with the heavy radial loads experienced, thrust loading is also present which tends to cause misalignment.
#Parts of a forklift mast cracked#
Some of these bearings have outer rings which are cracked allowing the insertion of extra balls, greatly increasing load capacity. In some cases, the lift truck manufacturer provides a sleeve for a replacement double row bearing. The configuration of the outer ring is designed to fit the contour of the mast channel. Mast Guide bearings have heavy section outer rings which serve as rollers or guides for the carriage in the mast channels. Mast Guide bearings are specifically designed to withstand the heavy radial loads required in this type of application. Chain Sheave roller bearings which facilitate the lifting and lowering of the mast are also an important part of the entire upright system.įorklift trucks handle loads ranging from light, bulky material to heavy loads in excess of 4,000 pounds. Ball bearings are a basic part of the mast as they guide and retain the forks in the vertical channels. An essential part of a forklift truck is the channeled lift structure which is commonly called the mast. Forklift trucks are employed in almost every manufacturing and shipping facility where lifting or movement of materials is required.
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