Stanley Black & Decker MBX15 Power Hammer User Manual


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10 ► MBX15 User Manual
PREPARATION FOR USE
Readthesection inthismanualtitled PREPARATION
FORUSEbeforeoperatingabreaker.Failuretofollow
thepreparationinstructionscanresultinseveredamage
tothebreakerandexcavatorandvoidthewarrantiesof
both.
POSITIONING THE EXCAVATOR
Figure4.PositiontheExcavator
With the breaker tool in place on the material to be
worked,positiontheexcavatorsothe dipperisatap-
proximately45°andthebreakerisalmostvertical.The
tracksoftheexcavatorshouldbeinlinewithboomsand
thebreaker.
POSITIONING THE BREAKER TOOL ON
THE WORK MATERIAL
Positionthetoolbitneartheedgeoftheworkmaterial,
notinthecenterorfarfromtheedge.Positionthetool
6-18inches(dependingonthematerial)fromtheedge.
Breakingoffsmallerpiecesofrockorconcreteusually
accomplishesmorethantryingtobreaklargerpieces.
Breakneartheedge
Figure5.PositiontheBreaker
On at material or rock,thebreakershouldbevertical
or“curled”backslightlytodirecttheimpactforcedown-
ward and toward the backhoe. This directs the force
backtowardtheedge oftheworkmaterial. Ifthetool
ispositionedinthecenterofthework,ortoofarfrom
theedge,theenergywillbeabsorbedintothematerial
withoutcrackingit.Donotrunthebreakerlongerthan
15-20 seconds. Ifbreakout does not occur within this
time,movethebreakertoanotherposition.
Onatmaterialsuchasconcreterunways,startingto
breakinthemiddleofthematerialmaycausevibrations
tobetransmittedthroughoutthebreakerandexcavator
becausethematerialhasnoplacetobreakto.Always
tryto startat apoint whichwill permitthe materialto
breakout.
MAINTAIN DOWN PRESSURE
Maintaininghardcontactwiththesurfaceofthematerial
tobebrokeninadditiontomaintainingadequate"down
force"isveryimportant.Alwayskeep"downpressure"
or"downforce"onthepointofthebreakerbyliftingthe
wheels,tracks,orstabilizersslightlyabovetheground.
This method takes the "slack" out of the bracket and
boompivots,and reducestheimpact onthepivots in
theboom.
Applydownpressure
Figure 6. Maintain Down Pressure
Theoperatorneedstobeconstantlyawareoftheamount
ofdownpressurebeingappliedandbeabletoadjustit
ifnecessary.Notenoughdownpressureresultsinlow
productionandaccelerateswearandtearontheequip-
ment.Toomuchdownpressuremaycausethebreaker
housingtoviolentlycrashintothebrokenmaterialwhen
"break-through"occurs.
Inanybreakingjob,theoperatorshouldmakeeveryef-
fortto“follow”thebreakerwith“down-pressure”asthe
machinebreaks farther into thematerial.The breaker
shouldbestoppedassoonas“break-thru”occursorifit
isapparentthatgoodsolidblowsarenotoccurring.
OPERATION
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