KUMHO TIRE AS POLICY

KUMHO TIRE AS POLICY

Customer Satisfaction

C/M OE Biz. Kumho Dealer

Customer Complaint

KUMHO TIREKUMHO TIRE

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1. KUMHO A/S Strategy

1. KUMHO A/S Strategy

2. Warranty Coverage

Kumho Tires are warranted against defects in materials or workmanshipin 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 (2/32ndsof 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.

2. Warranty Coverage

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.

3. KUMHO Compensation Policy

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 Remaining Tread Depth(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

② ③

①The most worn out point

R.T.D.(mm) =

①+ + / 3② ③

B. Where to Measure

1.Tire Inspection Procedure - Measuring the R.T.D.

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

Appearance

Photos

PC & LT Tires- Sidewall Indentation

An indentation on the sidewall of a radial tire

Probable Causes

Preventions

Sidewall Indentation

- 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.

- 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.

Appearance

Photos

PC & LT Tires - Cord Break Up (CBU)

A bulge on the sidewall of a radial tire

- Sidewalk

※ Probable Causes ※ Probable Causes

Cord Break Up (CBU)

- A puddle or hole on the road

※ Probable Causes ※ Probable Causes

Cord Break Up (CBU)

1. In a short time, we can find a bulge

in the part which got impact

Cord Break Up (CBU)

※ Appearance of damage ※ Appearance of damage

2. Also, most of cases, we can find

the mark of cord breakage in the

inside of the part

Probable Causes

Preventions

- The breakage of the body ply cords due to impact

from the outside.(sidewalk / puddle / hole etc.)

- Maintain proper air pressure

- Avoid high-speed driving.

- When a vehicle pass the obstacles,reduce the speed.

Cord Break Up (CBU)

Appearance

Photos

PC & LT Tires- Spread/Missed Cord (Bulge)

Radial, pencil shaped bulge on the sidewall of a radial tire

Co

rd M

issing

Cord

Probable Causes

Preventions

Spread/Missed Cord (Bulge)

- Wider than normal carcass wire spacing.

- Improper joint splicing during manufacturing process

- Consult with Kumho Eng’r

◈ The difference of Bulge and Cord Break-up

Spread/Missed Cord (Bulge)

Bulge Cord Break up

Outside

(sidewall/Rim)

Both side One side

No-markMark of the tire

sidewall damage

No-markMark of the rim

damage

Inside No-markMark of the cords

break

Appearance

Photos

PC & LT Tires- Flat Spot

Localized flat aspect on the tire tread area which was contacted on the ground

Probable Causes

Preventions

Flat Spot

- Shipping or storaging condition for a long time.

- Aggravated by low inflation pressure.

- Park the vehicle for a long time without changing

the position.

- Avoid to park the vehicle for a long time.

- Maintain high pressure for storage the vehicles.

- Change the contacted position regularly.

Appearance

Photos

PC & LT Tires - Belt Separation

A bulge or split through the upper shoulder & tread area

Probable Causes

Preventions

Belt Separation

- Maintain proper inflation pressure.

- Avoid overloading and overspeed driving.

- Consult with Kumho engineer.

- 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.

Appearance

Photos

PC & LT Tires- Tread&Shoulder Separation(Bias)

A bulge or split through the tread and shoulder area of a bias tire

Probable Causes

Preventions

Tread & Shoulder Separation(Bias Tire)

- 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.

- Maintain proper air pressure and avoid overloading.

- Avoid overspeed driving and sharp cornering.

Appearance

Photos

PC & LT Tires- Ply Turn-up Separation

Circum cracks above the rim line area with cord exposed

Probable Causes

Preventions

Ply Turn-up Separation

- Improper bead seating,improper rim size,overloaded

or underinflated condition or possible manufacturing

condition.

- Ensure proper rim size

- Maintain proper air pressure and avoid overloading.

Appearance

Photos

Bead toe rubber is torn or cut

PC & LT Tires –Torn Beads

Torn Beads

Probable Causes

Preventions

- Poor mounting/demounting techniques with tire tools

and/or lubrication, forklift damage and poor tire handling

procedures

- Review mounting/demounting procedures and tire tools.

- Ensure the tire beads are well lubricated.

- Also check new tire handling procedures.

Appearance

Photos

Local areas of distortion in the bead

PC & LT Tires –Distorted Bead

Probable Causes

Preventions

Distorted Bead

- Improper use of tools, or incorrect techniques used

when mounting the tire.

- Improper or defective rim(bent or rusty rims)

- Shipping/handling damage.

- Review mounting/demounting procedures and tire tools.

- Use proper rim and ensure the tire beads are lubricated.

- Also check new tire handling procedures.

Appearance

Photos

TB Tires – Bead Area - Bead Deform & Burst

Circumferencial deformation and/or burst of the bead area

Probable Causes

Preventions

Bead Area - Bead Deformation & Burst

- Rusty rims, improper bead lubrication, and bent or damaged

rims which result in improper bead seating.

- Excessive heat in the bead area.

- Review mounting/demounting procedures and the use of

tire tools

- Ensure the tire’s beads are well lubricated.

Appearance

Photos

TB Tires – Bead Area-Turn-up & Chafer Sepa.

Circumferencial cracks above the rim line area with cords exposed

Probable Causes

Preventions

Bead Area- Turn-up & Chafer Separation

- Improper bead seating,improper rim size,overloaded or

underinflated condition, impact or possible manufacturing

condition.

- Ensure proper rim size, mounting procedures, loading

condition and inflation pressures are utilized.

Appearance

Photos

TB Tires – Bead Area- Flow Crack

Circum cracks above the rim line area without cord exposed

Crack

Probable Causes

Preventions

Bead Area - Flow Crack

- Improper rubber flow during the manufacturing process.

- Aggravated by overloaded or underinflated condition.

- Ensure proper inflation pressure and loading condition.

- Consult with Kumho Engineer

Appearance

Photos

TB Tires – Side Area - Carcass Separation

Separation between belt & carcass cords in tire shoulder area

Probable Causes

Preventions

Side Area - Carcass Separation

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

- Maintain proper inflation pressure.

- Avoid overloading and overspeed driving.

- Avoid sudden starting,cornering and braking.

Appearance

Photos

TB Tires – Side Area - Vehicle Damage

Uniform scuffing or cutting on some part of the tire outside surface

Probable Causes

Preventions

Side Area - Vehicle Damage

- Contact with vehicle hardwares.

- Can also be caused by objects trapped between dual tires.

- Analyze the cause of the condition and correct it.

Appearance

Photos

TB Tires – Side Area - Weather Cracking

Numerous small cracks in the rubber surface

Probable Causes

Preventions

Side Area - Weather Cracking

- Rubber surface exposure to ozone.

- Aggravated by long periods of parking and/or sea side area.

- Minimize parked vehicle time.

Appearance

Photos

TB Tires – Side Area - Folklift Damage

Cut similar to impact damage on a brand new tire

Probable Causes

Preventions

Side Area - Folklift Damage

- Caused during handling procedures by folklift.

- Inspect tire upon receipt.

Appearance

Photos

TB Tires – Side Fatigue Rupture(Zipper crack)

A circum break in the mid to upper sidewall exposing an even line of broken cords

Probable Causes

Preventions

Side Area - Side Fatigue Rupture(Zipper crack)

Severe underinflation or overloading condition which

produces casing cord fatigue, often a result of a puncture.

- Routinely inspect all tires with inflation pressures.

- Avoid overloading.

Appearance

Photos

TB Tires – Side Area - Radial Split

A vertical break through the sidewall occuring between two body ply cables, that does not break

Probable Causes

Preventions

Side Area - Radial Split

- Severe impact.

- It can occur in overinflated and/or overloaded condition.

- Maintain proper inflation pressure and loading.

- Review driver training.

Appearance

Photos

TB Tires – Side Area- Open Sidewall Splice

Regular smooth opening of the sidewall rubber (No cords are exposed)

Probable Causes

Preventions

Side Area - Open Sidewall Splice

-Loss of adhesion in sidewall splice due to

manufacturing process.

-Consult with Kumho Eng’r.

Appearance

Photos

TB Tires – Tread Area - Belt Separation - I

Belt wire protruding through the exterior or interior surface of the tire

Appearance

Photos

TB Tires – Tread Area - Belt Separation-II

A bulge or split through the upper shoulder & tread area

Probable Causes

Preventions

Tread Area - Belt Separation

- Maintain proper inflation pressure.

- Avoid overloading and overspeed driving.

- Consult with Kumho engineer.

- 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.

Appearance

Photos

TB Tires – Tread Area - Chipping/Chunking

Rough, abraded tread surface with numerous small flakes or chunks of tread removed

Probable Causes

Preventions

Tread Area - Chipping / Chunking Tread

- Misapplication of the tire to service conditions.

- Caused by excessive loading on bad roads.

- Aggravated by overinflation and short turns, especially on

drive axle tires.

- Review tire selection.

- Avoid overloading

- Use traction type of tires in drive axle.

Appearance

Photos

TB Tires – Separation Due To Stone Drilling

Damage Causesd by stones trapped in the tread which penetrate the tread extend into the belts

Probable Causes

Preventions

Tread Area - Separation Due To Stone Drilling

Tread design and/or misapplication of the tire to service

conditions (gravel roads/Quarry operation)

- Remove remaining stones from the tread frequently.

- Review tire selection.

- Avoid overloading condition.

Appearance

Photos

TB Tires – Tread Area - Rib Tearing

Tear at the base of the main tread grooves, generally at the shoulder area

Probable Causes

Preventions

Tread Area - Rib Tearing

- Caused by running over curbs and rails, or by severe

localized impacts.

- Aggravated by overloading, hot tires and sharp turning.

- Review driving procedures.

- Avoid overloading condition, high speed driving and sharp

cornering.

Appearance

Photos

TB Tires – Tread Area - Heel & Toe Wear

Each lug around tire worn high to low from front to back edge

Probable Causes

Preventions

Tread Area - Heel & Toe Wear

- 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.

- Rotate tires regularly.

- Maintain proper air pressure and avoid overloading.

- Correct defective suspension.

Appearance

Photos

Others - Run Flat (TB-R)

Advanced deterioration of the tire affecting 360 of tire sidewall & inner liner⁰

Appearance

Photos

Others - Run Flat(PC/LR-R & Bias)

Advanced deterioration of the tire affecting 360 of tire sidewall & innerliner⁰

Probable Causes

Preventions

Run Flat

- Rapid loss of inflation pressure

- Continue to run after puncture.

- Running under extremely low inflation pressure.

- Maintain proper inflation pressure.

- Check the necessary things that related to air leakage.

(rim,valve & cap, tube and flap etc.)

Appearance

Photos

Others – Impact/Cut Damage

Localized break through the tire rubber and the casing by impact or cut

Appearance

Photos

Others – Impact/Cut Damage

Localized break through the tire rubber and the casing by impact or cut

Appearance

Photos

Others – Impact/Cut Damage

Localized break through the tire rubber and the casing by impact or cut

Probable Causes

Preventions

Impact/Cut Damage

- Severe, concentrated impact with a foreign object or a

chuck hole.

- Aggravated by over-inflation and high speed.

- Maintain proper inflation pressure.

- Avoid overloading and over-speed driving.

Appearance

Photos

Others - Penetration/Repair Related Bulge

An excessive or slight bulge in the sidewall associated with a repair or penetration

Probable Causes

Preventions

- Cord breakage due to penetration,impact, or cut.

- A tire with a repair may show this condition soon after

being repaired.

Penetration/Repair Related Bulge

Appearance

Photos

Others - Penetration

Evidence of a puncture or damage by foreign object through the tread or side area

Appearance

Photos

Others - Penetration

Evidence of a puncture or damage by foreign object through the tread or side area

Appearance

Photos

Others - Repaired Tire

Repaired on the interior or exterior area of the tire