Bradco 509 Manuel de l'opérateur télécharger pdf (Page 21)

OPERATING INSTRUCTIONS

6880 1-25-06-2

OPERATING TECHNIQUES

ATTACHMENT TYPE BACKHOES

BASIC DIGGING TECHNIQUE

 Whenstartinganexcavation,maketherstcutofeachsectionshallow,beingcarefulto

followtheexactlayoutoftheexcavation.Thereasonfortheshallowcutistominimizedam-

agetothesodandtofacilitatereplacement.Theserstcutsarealsoimportantbecausethey

willactasguidesfortheremainingcuts,thusgettingtherstfewcutsasaccurateaspossible

willhelpinkeepingallfuturecutsaccurate.

 Whendiggingwiththebackhoe,extendtheboom,dipperandbucketout,awayfromthe

operator.Lowertheboomanddippertostartthediggingprocess.Thebucketteethshouldbe

ata30°to45°entryangle.Asthediggingstarts,curlthebucketuntilthecuttingedgeislevel

withthehorizon.Crowdthebucketintowardtheoperatorworkingthebucketlevertokeepthe

bucketlevel.Asthebucketmovestowardtheoperator,manipulatetheboomlevertokeepthe

cutlevel.Attheendofthediggingcycle,crowdthedipperoutandcompletelycurlthebucket

whileliftingitfromtheexcavation.Onceyouhaveclearedtheexcavation,swingthebucket

tothespoilpile.Starttodumpthebucketbeforethepileisapproached.Oncethebucketis

empty,swingtheunitbacktotheexcavation,positioningthebucketanddipperforthenextcut

intheprocess.Thewholediggingprocessshouldbeonesmoothcyclethatisrepeateduntil

theexcavationiscompleted.

 Whentheexcavationhasbeendugtowithinsixinchesofthenishedbottom,clearand

touchupthesidesoftheexcavation.Usetheatsidesofthebuckettoscrapeoffanyhigh

spots.Dislodgeanyexposedrocksiftheyseemloose.Whennishingwalls,nishthefar

wallbycurlingthebucketout,crowdingthedipperout,andforcingthebucketdown.Tonish

theclosestwall,liftthebucketupandcurlitin.

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Bradco 509 Manuel de l'opérateur Page 21