HEMM-Dumper26
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Transcript of HEMM-Dumper26
AGENDAAGENDA
• Common Failures of Off-The-Road TiresCommon Failures of Off-The-Road Tires
• Preventative MaintenancePreventative Maintenance
– Underfoot ConditionsUnderfoot Conditions
– Project OperationsProject Operations
– Vehicle ConsiderationsVehicle Considerations
– Tire/Wheel/Valve HardwareTire/Wheel/Valve Hardware
– InflationInflation
COMMON FAILURESCOMMON FAILURES
• PuncturesPunctures
• CutsCuts
• Cut SeparationsCut Separations
• Tread/Belt SeparationsTread/Belt Separations
• Heat SeparationsHeat Separations
• Turn Up SeparationsTurn Up Separations
• Impact BreaksImpact Breaks
• Over DeflectionOver Deflection
PUNCTURESPUNCTURES
Cause Cause – – Small, Hard Object PenetratesSmall, Hard Object PenetratesTread, Carcass and Inner LinerTread, Carcass and Inner Liner
ResultResult –– Air Loss and Loss ofAir Loss and Loss ofCarcass StrengthCarcass Strength
CureCure –– Tire Can Usually Be RepairedTire Can Usually Be Repairedand Returned to Serviceand Returned to Service
CUTSCUTS
TypesTypes –– Cut through, Cut into Carcass,Cut through, Cut into Carcass,Tread and SW CutsTread and SW Cuts
Cause Cause – – Sharp Rock on Landing, HaulSharp Rock on Landing, HaulRoad, or Dumping AreasRoad, or Dumping Areas
ResultResult –– Depending on Type –Depending on Type –Cut Separation, CarcassCut Separation, CarcassWeakening, Air LossWeakening, Air Loss
CureCure –– Skiving or RepairingSkiving or Repairing
CUT SEPARATIONSCUT SEPARATIONS
Cause Cause – – Normal Shear Forces in aNormal Shear Forces in aWorking Tire After Cut DamageWorking Tire After Cut DamageHas Already OccurredHas Already Occurred
ResultResult –– Heat Build-Up and ConsequentHeat Build-Up and ConsequentIncrease in Size of SeparationIncrease in Size of Separation
CureCure –– Early Detection and SkivingEarly Detection and Skivingor Repairingor Repairing
TREAD/BELT TREAD/BELT SEPARATIONSSEPARATIONS
Cause Cause – – Shear Forces Which ExceedShear Forces Which ExceedTread/Belt or Belt/CarcassTread/Belt or Belt/CarcassInterface ResistanceInterface Resistance
ResultResult –– Component SeparationComponent Separationand Tire Failureand Tire Failure
CureCure –– NoneNone
HEAT SEPARATIONHEAT SEPARATION
Cause Cause – – Excessive TMPH RequirementsExcessive TMPH Requirementsor Brake Heator Brake Heat
ResultResult –– Tread or Bead Area Separation Tread or Bead Area Separation – – Rubber ReversionRubber Reversion
CureCure –– Normally NoneNormally None
TURN UP SEPARATIONTURN UP SEPARATION
Cause Cause – – Excessive Shear and/or BendingExcessive Shear and/or BendingForce in Bead Area. Excess LoadForce in Bead Area. Excess LoadCausing Tire to “Bend” over TopCausing Tire to “Bend” over Topof Flange.of Flange.
ResultResult –– Heat Buildup and SubsequentHeat Buildup and SubsequentSeparationSeparation
CureCure –– Proper and Evenly DistributedProper and Evenly DistributedLoading of VehicleLoading of Vehicle
IMPACT BREAKSIMPACT BREAKS
TypesTypes –– Impact Break, Impact BruiseImpact Break, Impact Bruise
Cause Cause – – Excessive Impact EnergyExcessive Impact EnergyLoading Beyond BreakingLoading Beyond BreakingStrength of CarcassStrength of Carcass
ResultResult –– Immediate Air LossImmediate Air Loss(Blow Out) or Damaged Cords (Blow Out) or Damaged Cords Causing SeparationCausing Separation
CureCure –– NoneNone
OVER DEFLECTIONOVER DEFLECTION
Cause Cause – – Under Inflation, Under Inflation, OverloadingOverloading
ResultResult –– Carcass Fatigue, Heat Carcass Fatigue, Heat Fatigue, Radial Cracking, Fatigue, Radial Cracking, Liner Failure, IrregularLiner Failure, IrregularWear PatternsWear Patterns
CureCure –– NoneNone
Underfoot ConditionsUnderfoot Conditions
PREVENTATIVE PREVENTATIVE MAINTENANCEMAINTENANCE
Off the road presentationOff the road presentation Goodyear TireGoodyear Tire 10751-1(10751xx1)10751-1(10751xx1) 5/2/97 MC5/2/97 MC 22
IMPROPER BEAD SETTINGIMPROPER BEAD SETTING
Area ofArea ofExcessive Excessive
FlexureFlexure
Bead Not Properly SeatedBead Not Properly SeatedBead Properly SeatedBead Properly Seated
G RingG RingG RingG Ring
DUAL TIRE ASSEMBLYDUAL TIRE ASSEMBLY
• Same Diameter SizeSame Diameter Size
• Same Construction TypeSame Construction Type
• Same ManufacturerSame Manufacturer
• Same ConstructionSame ConstructionAcross an AxleAcross an Axle
MatingMating
CORRECT TIRE INFLATIONCORRECT TIRE INFLATION
• Assures Load Carrying AbilityAssures Load Carrying Ability
• Reduces Incidence of Run LowReduces Incidence of Run Lowor Run Flator Run Flat
• Reduces Incident Separation Failures Due to Reduces Incident Separation Failures Due to OverdeflectionOverdeflection
• Reduces Impacts and Tread Cutting Due to Reduces Impacts and Tread Cutting Due to OverinflationOverinflation
• Saves MoneySaves Money
Underinflation (%)Underinflation (%)
H
ours
(%
)H
ours
(%
)
2020
3030
4040
5050
6060
7070
8080
9090
100100
00 1010 2020 3030 4040 5050
SOUND INFLATION SOUND INFLATION PROGRAMPROGRAM
• Conscientious Personnel Who Appreciate Conscientious Personnel Who Appreciate Importance of Proper InflationImportance of Proper Inflation
• Cap on Every ValveCap on Every Valve
• Accurate Pressure GaugesAccurate Pressure Gauges
• Cold Check Whenever Possible –Cold Check Whenever Possible –Ideally WeeklyIdeally Weekly
• Daily Hot Pressure ChecksDaily Hot Pressure Checks
INFLATION PRESSUREINFLATION PRESSURE
• Proper Inflation Pressure Is the Single Most Important Feature of a Proper Inflation Pressure Is the Single Most Important Feature of a Good Tire Maintenance ProgramGood Tire Maintenance Program
• Proper Inflation Pressure Is Dependent UponProper Inflation Pressure Is Dependent Upon– Load/OverloadLoad/Overload– SpeedSpeed– Type of ServiceType of Service– Tire TypeTire Type– Designed (%) DeflectionDesigned (%) Deflection
• ““Published” Inflation Pressures Are for Standard LoadsPublished” Inflation Pressures Are for Standard Loads• In General . . . When Overloads Are Encountered . . .In General . . . When Overloads Are Encountered . . .
The Inflation Pressure Should Be Increased 2% for Each 1% of The Inflation Pressure Should Be Increased 2% for Each 1% of OverloadOverload