Transcript AS POLICY AND TIRE INSPECTION
KUMHO TIRE AS POLICY
1. KUMHO A/S Strategy
1. KUMHO A/S Strategy
Customer Satisfaction Total Service C/M OE Biz.
OE A/S Network KUMHO TIRE Biz. Contract Kumho Dealer Real-time response Customer Complaint
2. Warranty Coverage
2. Warranty Coverage
Kumho Tires are warranted against defects in materials or workmanship in normal use on the vehicle for the life of the original usable tread. The life of original usable tread shall be ended when the 1.6mm (2/32nds of an inch) of tread remain.
◈
Non adjustable condition
- Road hazards such as punctures, cuts, scuffs or impact breaks.
- Improper inflation, overloading, improper mounting or demounting.
- Run flat, irregular wear due to misalignment.
- Tire worn beyond treadwear indicator.
- Ride disturbance caused by misalignment, damaged wheel or wheel imbalance.
3. KUMHO Compensation Policy
3. KUMHO Compensation Policy
A. Free Replacement
If a KUMHO tire fails as a result of workmanship or material defect during the first 25% wear rate compared to original tread depth for passenger radial tire, and the first 10% wear rate compared to original tread depth for the other tires, free replacement will be applied.
3. KUMHO Compensation Policy B. Pro-rated Replacement
If a KUMHO tire fails as a result of workmanship or material defect over 25% wear rate compared to the original usable tread depth for passenger radial tire and the first 10% wear rate compared to original tread depth for the other tires, pro-rated replacement will be applied.
Namely, the claim adjustment will be done in proportion of the remaining usable tread depth.
(R.T.D.-T.W.I.) Compensation amount = P x x (1 + rate of tax & expenses) (O.T.D.-T.W.I.)
3. KUMHO Compensation Policy C. Ride Complaint
If KUMHO tire fails due to the out of balance tire, the out of round tire within 10% wear rate of the original casing life, free replacement will be applied. Whereas, KUMHO can not guarantee the claim tire which is the out of balance tire, the out of round tire over 10% wear rate of the original casing life.
CLAIM TIRE INSPECTION
CONTENTS
1.Tire Inspection Procedure 2.Tire Claim : Problem Conditions & Causes - PC & LT Tires - TB & Others Claim
1.Tire Inspection Procedure A. Confirm the brand name : KH, MS, RC B. Check the tire Size / Pattern / Ply Rating C. Check the DOT No. or Serial No.(for TB) D. Measure the R emaining T read D epth( RTD ) E. Check the tire condition (Tread wear condition, Any damage or evidence for repairing, etc.) : Tread -> Sidewall -> Bead -> Inside F. Inspect the damaged parts.
G. Explain the condition & the cause of damage to the customer.
1.Tire Inspection Procedure Measuring the R.T.D.
A. Measuring Method
①
The most worn out point
R.T.D.(mm) =
①
+
②
+
③
/ 3
② ③
1.Tire Inspection Procedure Measuring the R.T.D.
B. Where to Measure
1.Tire Inspection Procedure Measuring the R.T.D.
B. Where to Measure
1.Tire Inspection Procedure Measuring the R.T.D.
B. Where to Measure
2.Tire Claim : Problem Conditions & Causes A. PC & LT Tires B. TB & Others Claim - Bead Area - Sidewall Area - Tread Area - Others
PC & LT Tires Sidewall Indentation Appearance Photos An indentation on the sidewall of a radial tire
Sidewall Indentation Probable Causes - Originated by the joint overlap of cord sheet during the manufacturing process.
- It cause the difference of the expansion between the section of overlapping and non overlapping.
Preventions - The indentation is a common characteristic of radial tires and will not affect the performance or the safety of the tire. So,try to explain to the customer.
PC & LT Tires Cord Break Up (CBU) Appearance Photos A bulge on the sidewall of a radial tire
Cord Break Up (CBU)
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Probable Causes - Sidewalk
Cord Break Up (CBU)
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Probable Causes - A puddle or hole on the road
Cord Break Up (CBU)
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Appearance of damage 1. In a short time, we can find a bulge in the part which got impact 2. Also, most of cases, we can find the mark of cord breakage in the inside of the part
Cord Break Up (CBU) Probable Causes - The breakage of the body ply cords due to impact from the outside.(sidewalk / puddle / hole etc.) Preventions - Maintain proper air pressure - Avoid high-speed driving.
- When a vehicle pass the obstacles,reduce the speed.
PC & LT Tires Spread/Missed Cord (Bulge) Appearance Photos
Radial, pencil shaped bulge on the sidewall of a radial tire
Cord
Spread/Missed Cord (Bulge) Probable Causes
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Wider than normal carcass wire spacing.
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Improper joint splicing during manufacturing process Preventions Consult with Kumho Eng’r
Spread/Missed Cord (Bulge)
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The difference of Bulge and Cord Break-up Outside (sidewall/Rim) Inside Bulge Both side No-mark No-mark No-mark Cord Break up One side Mark of the tire sidewall damage Mark of the rim damage Mark of the cords break
PC & LT Tires Flat Spot Appearance Localized flat aspect on the tire tread area which was contacted on the ground Photos
Flat Spot Probable Causes - Shipping or storaging condition for a long time.
- Aggravated by low inflation pressure.
- Park the vehicle for a long time without changing the position.
Preventions - Avoid to park the vehicle for a long time.
- Maintain high pressure for storage the vehicles.
- Change the contacted position regularly.
PC & LT Tires Belt Separation Appearance Photos A bulge or split through the upper shoulder & tread area
Belt Separation Probable Causes - Loose or separated steel wires due to low air pressure and/or high speed driving.
- Adhesion loss within the tire at the edge of the belt.
- May be associated with a penetration or other damage.
Preventions - Maintain proper inflation pressure.
- Avoid overloading and overspeed driving.
- Consult with Kumho engineer.
PC & LT Tires Tread&Shoulder Separation(Bias) Appearance Photos A bulge or split through the tread and shoulder area of a bias tire
Tread & Shoulder Separation(Bias Tire) Probable Causes - It is mainly due to underinflation.
- The cause is overheating of the tire due to underinflation, which weakens the adhesive between the cord and the rubber layer.
Preventions - Maintain proper air pressure and avoid overloading.
- Avoid overspeed driving and sharp cornering.
PC & LT Tires Ply Turn-up Separation Appearance Photos Circum cracks above the rim line area with cord exposed
Ply Turn-up Separation Probable Causes - Improper bead seating,improper rim size,overloaded or underinflated condition or possible manufacturing condition.
Preventions - Ensure proper rim size - Maintain proper air pressure and avoid overloading.
PC & LT Tires – Torn Beads Appearance Bead toe rubber is torn or cut Photos
Torn Beads Probable Causes - Poor mounting/demounting techniques with tire tools and/or lubrication, forklift damage and poor tire handling procedures Preventions
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Review mounting/demounting procedures and tire tools.
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Ensure the tire beads are well lubricated.
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Also check new tire handling procedures.
PC & LT Tires – Distorted Bead Appearance Photos Local areas of distortion in the bead
Distorted Bead Probable Causes
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Improper use of tools, or incorrect techniques used when mounting the tire.
- Improper or defective rim(bent or rusty rims)
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Shipping/handling damage.
Preventions
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Review mounting/demounting procedures and tire tools.
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Use proper rim and ensure the tire beads are lubricated.
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Also check new tire handling procedures.
TB Tires – Bead Area Bead Deform & Burst Appearance Photos Circumferencial deformation and/or burst of the bead area
Bead Area Bead Deformation & Burst Probable Causes
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Rusty rims, improper bead lubrication, and bent or damaged rims which result in improper bead seating.
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Excessive heat in the bead area.
Preventions
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Review mounting/demounting procedures and the use of tire tools Ensure the tire’s beads are well lubricated.
TB Tires – Bead Area Turn-up & Chafer Sepa.
Appearance Circumferencial cracks above the rim line area with cords exposed Photos
Bead Area Turn-up & Chafer Separation Probable Causes - Improper bead seating,improper rim size,overloaded or underinflated condition, impact or possible manufacturing condition.
Preventions - Ensure proper rim size, mounting procedures, loading condition and inflation pressures are utilized.
TB Tires – Bead Area Flow Crack Appearance Photos Circum cracks above the rim line area without cord exposed Crack
Bead Area Flow Crack Probable Causes
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Improper rubber flow during the manufacturing process.
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Aggravated by overloaded or underinflated condition.
Preventions
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Ensure proper inflation pressure and loading condition.
- Consult with Kumho Engineer
TB Tires – Side Area Carcass Separation Appearance Photos Separation between belt & carcass cords in tire shoulder area
Side Area Carcass Separation Probable Causes Loss of adhesion between belt and carcass ply from excessive heat and stress generated by improper inflation pressure, overloading, excessive high speed and friction from sudden starting, cornering and braking Preventions - Maintain proper inflation pressure.
- Avoid overloading and overspeed driving.
- Avoid sudden starting,cornering and braking.
TB Tires – Side Area Vehicle Damage Appearance Photos Uniform scuffing or cutting on some part of the tire outside surface
Side Area Vehicle Damage Probable Causes - Contact with vehicle hardwares.
- Can also be caused by objects trapped between dual tires. Preventions - Analyze the cause of the condition and correct it.
TB Tires – Side Area Weather Cracking Appearance Photos Numerous small cracks in the rubber surface
Side Area Weather Cracking Probable Causes - Rubber surface exposure to ozone.
- Aggravated by long periods of parking and/or sea side area.
Preventions - Minimize parked vehicle time.
TB Tires – Side Area Folklift Damage Appearance Photos Cut similar to impact damage on a brand new tire
Side Area Folklift Damage Probable Causes - Caused during handling procedures by folklift.
Preventions - Inspect tire upon receipt.
TB Tires – Side Fatigue Rupture(Zipper crack) Appearance Photos A circum break in the mid to upper sidewall exposing an even line of broken cords
Side Area Side Fatigue Rupture(Zipper crack) Probable Causes Severe underinflation or overloading condition which produces casing cord fatigue, often a result of a puncture.
Preventions - Routinely inspect all tires with inflation pressures.
- Avoid overloading.
TB Tires – Side Area Radial Split Appearance A vertical break through the sidewall occuring between two body ply cables, that does not break Photos
Side Area Radial Split Probable Causes - Severe impact.
- It can occur in overinflated and/or overloaded condition.
Preventions - Maintain proper inflation pressure and loading.
- Review driver training.
TB Tires – Side Area Open Sidewall Splice Appearance Photos Regular smooth opening of the sidewall rubber (No cords are exposed)
Side Area Open Sidewall Splice Probable Causes -Loss of adhesion in sidewall splice due to manufacturing process.
Preventions Consult with Kumho Eng’r.
TB Tires – Tread Area Belt Separation - I Appearance Photos Belt wire protruding through the exterior or interior surface of the tire
TB Tires – Tread Area Belt Separation-II Appearance Photos A bulge or split through the upper shoulder & tread area
Tread Area Belt Separation Probable Causes - Loose or separated steel wires due to low air pressure and/or high speed driving.
- Adhesion loss within the tire at the edge of the belt.
- May be associated with a penetration or other damage.
Preventions - Maintain proper inflation pressure.
- Avoid overloading and overspeed driving.
- Consult with Kumho engineer.
TB Tires – Tread Area Chipping/Chunking Appearance Rough, abraded tread surface with numerous small flakes or chunks of tread removed Photos
Tread Area Chipping / Chunking Tread Probable Causes - Misapplication of the tire to service conditions.
- Caused by excessive loading on bad roads.
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Aggravated by overinflation and short turns, especially on drive axle tires.
Preventions - Review tire selection.
- Avoid overloading - Use traction type of tires in drive axle.
TB Tires – Separation Due To Stone Drilling Appearance Damage Causesd by stones trapped in the tread which penetrate the tread extend into the belts Photos
Tread Area Separation Due To Stone Drilling Probable Causes Tread design and/or misapplication of the tire to service conditions (gravel roads/Quarry operation) Preventions - Remove remaining stones from the tread frequently.
- Review tire selection.
- Avoid overloading condition.
TB Tires – Tread Area Rib Tearing Appearance Photos Tear at the base of the main tread grooves, generally at the shoulder area
Tread Area Rib Tearing Probable Causes - Caused by running over curbs and rails, or by severe localized impacts.
- Aggravated by overloading, hot tires and sharp turning.
Preventions - Review driving procedures.
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Avoid overloading condition, high speed driving and sharp cornering.
TB Tires – Tread Area Heel & Toe Wear Appearance Photos Each lug around tire worn high to low from front to back edge
Tread Area Heel & Toe Wear Probable Causes - Untimely rotation of tires.
- Under-inflation and/or overloading condition.
- Caused by mismatched inflation pressures or tire diameter in a dual assembly and certain conditions such as mountainous terrains, etc.
Preventions - Rotate tires regularly.
- Maintain proper air pressure and avoid overloading.
- Correct defective suspension.
Others Run Flat (TB-R) Appearance Photos Advanced deterioration of the tire affecting 360⁰ of tire sidewall & inner liner
Others Run Flat(PC/LR-R & Bias) Appearance Photos Advanced deterioration of the tire affecting 360⁰ of tire sidewall & innerliner
Run Flat Probable Causes - Rapid loss of inflation pressure - Continue to run after puncture.
- Running under extremely low inflation pressure.
Preventions - Maintain proper inflation pressure.
- Check the necessary things that related to air leakage.
(rim,valve & cap, tube and flap etc.)
Others – Impact/Cut Damage Appearance Photos Localized break through the tire rubber and the casing by impact or cut
Others – Impact/Cut Damage Appearance Photos Localized break through the tire rubber and the casing by impact or cut
Others – Impact/Cut Damage Appearance Photos Localized break through the tire rubber and the casing by impact or cut
Impact/Cut Damage Probable Causes - Severe, concentrated impact with a foreign object or a chuck hole.
- Aggravated by over-inflation and high speed.
Preventions - Maintain proper inflation pressure.
- Avoid overloading and over-speed driving.
Others Penetration/Repair Related Bulge Appearance Photos An excessive or slight bulge in the sidewall associated with a repair or penetration
Penetration/Repair Related Bulge Probable Causes - Cord breakage due to penetration,impact, or cut.
- A tire with a repair may show this condition soon after being repaired.
Preventions
Others Penetration Appearance Photos Evidence of a puncture or damage by foreign object through the tread or side area
Others Penetration Appearance Photos Evidence of a puncture or damage by foreign object through the tread or side area
Others Repaired Tire Appearance Photos Repaired on the interior or exterior area of the tire