and the nature of end products required for constructionprojects. The four basic setups are as follows:1. The jaw crusher is used alone to work withquarry rock. Large quantities of material are ordinarilyneeded for base course, roads, and airfields; the fineparticles are desired for binder. This means all of thecrushed material is used together with no screeningnecessary.2. The primary and secondary units are used inconjunction with each other to produce gradedaggregate from quarry rock. The material is reduced insuccessive stages and screened to separate material intosize ranges required to meet specifications.3. The primary and secondary units are usedtogether to produce graded aggregate from graveldeposits which are too large in size to be handled by thesecondary unit alone.4. The secondary unit is used alone when the bulkof material in a gravel deposit does not exceed 3 inchesin diameter. In this case, a positive means is provided tolimit the size of material fed to the unit.Rarely are two aggregate production operationsexactly the same. Each project must be analyzed on thebasis of its own particular conditions and requirements.The 75-tph plant equipment is sufficiently flexible tomeet all aggregate requirements of constructionbattalions.Maintaining Quarry EquipmentBecause of the working conditions around acrushing operation, the entire crew must be totallyfamiliar with the manufacturer’s requirements and anyspecial conditions that may exist. This ensures propermaintenance and the safe and productive operation ofthe crusher equipment.The entire quarry and rock production operationdepends on proper and adequate maintenance ofequipment. A regulated program of maintenance,including step-by-step procedures, is recommended foreach piece of equipment.In contrast to other types of construction equipment,procurement of repair parts and new units for crushingand screening equipment requires a much greater leadtime. Without proper parts and units, production eitherslows down or stops altogether.As the supervisor in charge of crushing andscreening operations, you must ensure operatormaintenance procedures are performed by the operatorsand maintenance mechanics to ensure continuousoperation of the equipment.WARNINGBe sure the main power sources remains“OFF” and are properly “red-tagged” whilepersonnel are working on electrical equipment.Frequent inspections should be made duringoperations to ensure that the equipment is not beingabused, that the units are level and cribbed, thatcalibrations are correct, and that proper shutdownprocedures are followed.6-16
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