pomp’s tire service, inc. irregular wear training
TRANSCRIPT
Pomp’s Tire Service, Pomp’s Tire Service, Inc.Inc.
IRREGULAR IRREGULAR WEAR TRAINING WEAR TRAINING
CAUSES OF IRREGULAR CAUSES OF IRREGULAR WEARWEAR
WORN – OUT TIRESWORN – OUT TIRES
WORN – OUT RADIAL TIRES ACT WORN – OUT RADIAL TIRES ACT AS A MESSENGER TO RELATE TO AS A MESSENGER TO RELATE TO
POSSIBLE MECHANICAL POSSIBLE MECHANICAL CONDITIONS CONDITIONS
Irregular Irregular WearWear
CATEGORIES OF CATEGORIES OF
IRREGULAR WEARIRREGULAR WEAR
Consistent Circumferential Consistent Circumferential Irregular Wear -- a wear pattern all the Irregular Wear -- a wear pattern all the way around the tireway around the tire
Spotty Irregular Wear -- wear pattern in Spotty Irregular Wear -- wear pattern in various places on the tirevarious places on the tire
CAUSES OF CAUSES OF
CIRCUMFERENTIALCIRCUMFERENTIAL
IRREGULAR WEARIRREGULAR WEAR Vehicle misalignmentVehicle misalignment Inflation pressureInflation pressure Mismatched dualsMismatched duals Inconsistent dual inflationInconsistent dual inflation Lateral scrubLateral scrub Torque stressTorque stress Tread designTread design
FFEATHER EDGE WEAREATHER EDGE WEAR Appearance Appearance
- - One edge of each rib higher than theOne edge of each rib higher than the otherother
What’s happeningWhat’s happening
- - Tire not tracking straight down highwayTire not tracking straight down highway
Probable causesProbable causes
- - Vehicle misalignmentVehicle misalignment
- toe- toe
- rear axle- rear axle
Corrective actionCorrective action
- - Steer tireSteer tire
- Correct toe in or toe out- Correct toe in or toe out
- Correct rear axle misalignment- Correct rear axle misalignment
-- Drive or trailer tires Drive or trailer tires
- Align axles- Align axles
OONE-SIDED WEARNE-SIDED WEAR
Appearance Appearance
- - Excessive wear on one side of the tireExcessive wear on one side of the tire-- May begin as feather edge wear and May begin as feather edge wear and advance to one-sided wearadvance to one-sided wear
What’s happeningWhat’s happening- - Tire is worn from corrective steeringTire is worn from corrective steering due to vehicle thrust, cocked, tilted,due to vehicle thrust, cocked, tilted, or axle is bendingor axle is bending
Probable causesProbable causes
- - Vehicle misalignmentVehicle misalignment
- rear axle- rear axle
- toe- toe
- camber- camber
-- Overloaded axles Overloaded axles
OONE-SIDED WEAR ContinuedNE-SIDED WEAR Continued
Corrective actionCorrective action
- - Steer tiresSteer tires
- Correct rear axle - Correct rear axle misalignmentmisalignment
- correct toe in or toe out- correct toe in or toe out
- check and correct camber- check and correct camber
- check load specifications- check load specifications
on axleson axles
-- Drive or trailer tires Drive or trailer tires
- align axles- align axles
EEROSION/RIVER/ROSION/RIVER/
CHANNEL WEARCHANNEL WEAR Appearance Appearance
- - Wavy channel wear along rib edgesWavy channel wear along rib edges
following major tread voidsfollowing major tread voids
What’s happeningWhat’s happening- Frequently occurs in free rolling- Frequently occurs in free rolling
wheel positionwheel position
- Typical of tires with slow rate of wear- Typical of tires with slow rate of wear
Probable causesProbable causes- Tread element movement laterally- Tread element movement laterally
Corrective ActionCorrective Action
- - Remount and run in the opposite direction or install on a trailerRemount and run in the opposite direction or install on a trailer
AALTERNATE LUG WEARLTERNATE LUG WEAR AppearanceAppearance
- - Alternate lugs wearing faster thanAlternate lugs wearing faster than
adjacent lugsadjacent lugs
-- May skip some lugs May skip some lugs
What’s happeningWhat’s happening-- Lugs not wearing consistently Lugs not wearing consistently
-- Lugs not making uniform contact Lugs not making uniform contact
with highwaywith highway Probable causesProbable causes
-- Tread design Tread design
-- Inconsistent dual inflation Inconsistent dual inflation
-- Mismatched duals Mismatched duals
Corrective ActionCorrective Action- - Consider different tread designConsider different tread design
-- Inflate tires to fleet standard Inflate tires to fleet standard
-- Match duals by tread design and tires size Match duals by tread design and tires size
CCAUSES OF AUSES OF CCIRCUMFERENTIALIRCUMFERENTIAL
IIRREGULAR RREGULAR WWEAREAR
Vehicle MisalignmentVehicle Misalignment
CCAUSES OF AUSES OF CCIRCUMFERENTIALIRCUMFERENTIAL
IIRREGULAR RREGULAR WWEAREAR Vehicle MisalignmentVehicle Misalignment
rear axle misalignmentdirection of
travel
CCAUSES OF AUSES OF CCIRCUMFERENTIALIRCUMFERENTIAL
IIRREGULAR RREGULAR WWEAREAR
Inflation Pressure And LoadInflation Pressure And Load
Properly inflated for load
Under-inflated for load
Over-inflated for load
Air Pressure and Tire Inspection
Master Gauge
Single Axle with 3,000 poundsSingle Axle with 3,000 pounds
Same Axle with 8,000 poundsSame Axle with 8,000 pounds
Same Axle with 18,000 poundsSame Axle with 18,000 pounds
ANY TIRE WITH LESS ANY TIRE WITH LESS THAN 80% OF THAN 80% OF
RECOMMENDED AIR RECOMMENDED AIR PRESSURE IS SUSPECTPRESSURE IS SUSPECT
TO ZIPPERTO ZIPPER
CCAUSES OF AUSES OF CCIRCUMFERENTIALIRCUMFERENTIAL
IIRREGULAR RREGULAR WWEAREAR Mismatched Duals Mismatched Duals
When duals are mismatched:the larger diameter tire carries more loadthe smaller diameter tire wears fasterdrive train may be damaged
INSPECTING TIRES IN USE
Dual MatchingDual Matching
Old rule – Anything less than 4/32nds Old rule – Anything less than 4/32nds tread depth variance was acceptabletread depth variance was acceptable
All tires are not created equalAll tires are not created equal R195 can be ¾ inch smaller than a G302 R195 can be ¾ inch smaller than a G302
casingcasing Match casing manufacturer and modelMatch casing manufacturer and model Measure with some type of toolMeasure with some type of tool
SPOTTY SPOTTY IRREGULAR IRREGULAR WEARWEAR
CCONDITIONS OF ONDITIONS OF SSPOTTYPOTTY IIRREGULAR RREGULAR WWEAREAR
Cupping/scallop wearCupping/scallop wear Diagonal wearDiagonal wear Brake skid/flat spot wearBrake skid/flat spot wear Rib punchRib punch
CCAUSES OF SPOTTYAUSES OF SPOTTY
IIRREGULAR RREGULAR WWEAREAR Mismounted tire/wheel assemblyMismounted tire/wheel assembly Loose wheel bearingsLoose wheel bearings Worn bearings, shocks, springsWorn bearings, shocks, springs
or other suspension componentsor other suspension components Mismatched dualsMismatched duals Inconsistent dual inflationInconsistent dual inflation Out of balance wheel assemblyOut of balance wheel assembly Brake MisapplicationBrake Misapplication Aggressive brake applicationAggressive brake application
CCUPPING/UPPING/SSCALLOP CALLOP WWEAREAR
Appearance Appearance - - Irregular, scalloped outer rib wearIrregular, scalloped outer rib wear
What’s happeningWhat’s happening-- Tire not tracking straight down Tire not tracking straight down
highwayhighway
-- Tire bouncing slightly sideways Tire bouncing slightly sideways
Probable causesProbable causes-- Loose wheel bearings Loose wheel bearings
-- Mismounted tire/wheel assembly Mismounted tire/wheel assembly
-- Out of balance wheel assembly Out of balance wheel assembly
-- Tread design Tread design
-- Worn bearings, shocks, springs or other suspension Worn bearings, shocks, springs or other suspension components components
-- Mismatched duals Mismatched duals
-- inconsistent dual inflation inconsistent dual inflation
CCUPPING/UPPING/SSCALLOP CALLOP WWEAR EAR ContinuedContinued
Corrective ActionCorrective Action
- - Tighten wheel bearingsTighten wheel bearings
-- Check wheel assembly for proper Check wheel assembly for proper
mounting of tire on wheel and axlemounting of tire on wheel and axle
- Match duals by tread design and tire- Match duals by tread design and tire
size size
- Inflate tires to fleet standard- Inflate tires to fleet standard
DDIAGONAL IAGONAL WWEAREAR
AppearanceAppearance
- - Flat spots worn diagonally acrossFlat spots worn diagonally across
tread, repeated around tiretread, repeated around tire
circumferencecircumference
-- Tire pounding on highway Tire pounding on highway
-- Tire vibration Tire vibration
What’s happeningWhat’s happening
- - Tire not tracking straight downTire not tracking straight down
highwayhighway
-- Tire bouncing slightly sideways Tire bouncing slightly sideways
DDIAGONAL IAGONAL WWEAR ContinuedEAR Continued Probable causesProbable causes
-- Loose wheel bearings Loose wheel bearings-- Mismounted tire/wheel assembly Mismounted tire/wheel assembly
-- Out of balance wheel assembly Out of balance wheel assembly-- Tread design Tread design-- Worn bearings, shocks, springs or Worn bearings, shocks, springs or other suspension componentsother suspension components
-- Mismatched duals Mismatched duals-- Inconsistent dual inflation Inconsistent dual inflation
Corrective ActionCorrective Action- - Tighten wheel bearingsTighten wheel bearings- - Check wheel assembly for properCheck wheel assembly for proper mounting of tire on wheel and axlemounting of tire on wheel and axle-- Test other tire brands, tire series or tread design Test other tire brands, tire series or tread design-- Match duals by tread design and tire size Match duals by tread design and tire size-- Inflate tires to fleet standard Inflate tires to fleet standard
Centering Hub Centering Hub Piloted Wheel Piloted Wheel SystemsSystems
QUESTIONS ?QUESTIONS ?
COMMENTS ?COMMENTS ?
CONCERNS ? CONCERNS ?
THANK YOUTHANK YOU
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