NOTE: The push cat operator should be extremelycautious in NOT hitting the rear scraper tires with thedozer blade.The push cat operator must ensure that thereinforced section of the dozer blade is centered on thescraper rear push block. Additionally, the push catoperator must be alert to turns made by the scraper thatmight cause the push cat to apply unequal pushing force.This could result in the dozer blade contacting thescraper rear tires or causing the scraper to jackknife.The push cat should continue pushing after the scraperhas a full load to give the scraper a boost in leaving thecut.HaulingAfter the scraper is fully loaded and has reached thehaul road, the operator should raise the bowl to travelheight and proceed to the fill or dump area in the highestgear range practicable. The bowl travel height shouldbe no higher than needed to clear any obstacles on thehaul road. A low bowl height allows better control ofthe scraper by keeping the center of gravity low andpreventing the loss of time needed to lower the bowl, asthe scraper approaches the fill area. The best bowlheight is the height at which the bowl must be in whenthe load is spread.When hauling down steep grades, lower the bowluntil the blade drags to slow the scraper down. Whentraveling over a slippery haul road, keep the cuttingedges as close to the road as possible to allow for a fastemergency stop by dropping the bowl.When traveling over haul roads, avoid holes andlarge obstacles that may damage the scraper tires. Whenmaking sharp turns, allow enough clearance for thelength and width of the scraper to keep the scraperwheels on the road.Spreading or UnloadingWhen approaching the fill area, lower or raise thescraper bowl to the depth of fill desired. The speed ofthe scraper must also be adjusted for this depth, such asa high speed for a thin spread or a slower speed for adeep spread.To start spreading, raise the apron by engaging theapron control lever to allow the material to fall out ofthe bowl. The size of the apron opening depends mainlyupon the depth of the spread and type of material beingspread; for example, a thin layer of free-flowing sandneeds a fairly small apron opening and a high travel10-22speed, while a thin spread of wet clay will need a largeropening and a slower travel speed.After the apron opening has been adjusted and thedirt flowing through the opening lessens, engage theejector lever to finish unloading the scraper bowl. Whenthe scraper is empty, engage the ejector lever to returnthe ejector to the rear of the bowl and lower the apron.Unloading techniques are as follows:. Keep the scraper moving while unloading.Stopping when unloading on soft fill costs productiontime by needless shifting and the possible miring downof the scraper.l Always make an even spread, so the next trip willnot be rough.. If possible, when traveling out of a fill, pass backover the area you have just filled to compact it with thelarge scraper tires.Returning to the CutAfter the scraper is unloaded and has reached thehaul road, return to the cut as soon as possible. Whenreturning to the cut, carry the scraper bowl high enoughto avoid any haul road obstacles, yet low enough for safehandling of the scraper. Carrying the bowl low allowsfor quick lowering of the bowl to stop the scraper in theevent of an emergency. Allow plenty of room for therear wheel of the scraper to avoid obstacles whenmaking tight turns, and maintain a safe speed for thecondition of the haul road.WORKING DIFFICULT MATERIALSSpecial operating techniques are required whenperforming scraper operations in difficult materials,such as wet or sticky material, loose sand or gravel, andlarge objects.Wet and Sticky MaterialsWhen unloading wet and sticky material, do not tryto spread the material too thin. Always keep the bowlhigh enough to allow the material to flow back under thescraper. Open the apron wide enough to allow an easyflow out of the bowl, Bring the ejector forward withshort, snappy movements of the ejector control lever toshake the material loose from it. Allow a little timebetween each ejector movement to avoid compactingthe material between the apron and ejector. In somecases, shifting the ejector between forward and reverse
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