Pit & Quarry, November 2018
WASHING CLASSIFYING FINE MATERIAL SCREW WASHER MAINTENANCE While the fine material screw washer may be among the simplest machines to maintain in an aggregate plant appropriate safety precautions must always be taken This includes using a lockout tagout of the motor starters before performing maintenance on any moving components Proper lubrication of the bearings that support each end of the screw shaft should provide long bearing life In some cases the lubrication requirements of seals on submerged rear bearings are less than the requirements of the bearing itself A non lubricated seal almost always leads to more frequent rear bearing failures and downtime with a loss of production If the discharge end of the screw shaft is supported by a standard pillow block bearing it is often recommended that a lube line be run down the support to near ground level so maintenance personnel can regularly supply grease if a service platform is not at the level of this bearing Typically the screw shaft is turned by an electric motor with a V belt drive into a shaft mounted reducer Periodic inspection of V belts for both wear and tensioning is also recommended to reduce downtime and unexpected failures Changing the reducer gear oil in accordance with the manufacturers recommendations usually provides for a long gearbox life If the reducer on the machine has been in service for several years periodic evaluation for contaminants in the gear oil is recommended to avoid an untimely failure The need to replace wear shoes can easily be determined by visual inspection Replacement shoes are typically available in the manufacturers standard iron urethane or rubber types The best abrasion resistant material for wear shoes may be dependent on the chemical composition and particle shape of the sand being dewatered For instance very abrasive sands such as crushed granite sand or sandstone can abrade or gouge synthetic wear shoes reducing wear life Performing your own checkup or getting the assistance of the manufacturers local dealer can often result in less downtime providing the highest availability for the operation of a fine material screw washer And just like sand classifying tanks a manufacturers manual typically includes a list of recommended spare parts that operators should keep handy P Q Information for this article courtesy of McLanahan Corp Fines Recovery Equipment Doing What We Do Best Building Fines Recovery Equipment High Rate Thickener Dewatering Screen Fractionator Super Cutter Hydro Cyclone Plate Frame Press Vertical Durability Cell Providing Solutions Call 866 616 9351 or Visit www azfab com Made in USA 20 PIT QUARRY November 2018 pitandquarry com
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