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KUMHO TIRE AS POLICY

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KUMHO TIRE AS POLICY - PowerPoint PPT Presentation


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KUMHO TIRE AS POLICY. 1. KUMHO A/S Strategy. 1. KUMHO A/S Strategy. Customer Satisfaction. Total Service. C/M OE Biz. Kumho Dealer. KUMHO TIRE. Biz. Contract. OE A/S Network. Real-time response. Customer Complaint. 2. Warranty Coverage. 2. Warranty Coverage.

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Presentation Transcript
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1. KUMHO A/S Strategy

1. KUMHO A/S Strategy

Customer Satisfaction

Total Service

C/M OE Biz.

Kumho Dealer

KUMHO TIRE

Biz. Contract

OE A/S Network

Real-time response

Customer Complaint

slide3

2. Warranty Coverage

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.

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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.

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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.)

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3. KUMHO Compensation Policy

C. Ride Complaint IfKUMHO 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.

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CONTENTS

1.Tire Inspection Procedure

2.Tire Claim : Problem Conditions & Causes

- PC & LT Tires

- TB & Others Claim

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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.

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

A. Measuring Method

①The most worn out point

R.T.D.(mm) =

①+ ②+ ③ / 3

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2.Tire Claim : Problem Conditions & Causes

  • PC & LT Tires
  • B. TB & Others Claim
  • - Bead Area
  • - Sidewall Area
  • - Tread Area
  • - Others
slide15

PC & LT Tires- Sidewall Indentation

Appearance

An indentation on the sidewall of a radial tire

Photos

slide16

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.

slide17

PC & LT Tires - Cord Break Up (CBU)

Appearance

A bulge on the sidewall of a radial tire

Photos

slide18

Cord Break Up (CBU)

※ Probable Causes

- Sidewalk

slide19

Cord Break Up (CBU)

※ Probable Causes

- A puddle or hole on the road

slide20

Cord Break Up (CBU)

※ 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

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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.

slide22

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

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

Appearance

Photos

Cord

Cord Missing

slide23

Spread/Missed Cord (Bulge)

Probable Causes

  • Wider than normal carcass wire spacing.
  • Improper joint splicing during manufacturing process

Preventions

- Consult with Kumho Eng’r

slide24

Spread/Missed Cord (Bulge)

◈ The difference of Bulge and Cord Break-up

slide25

PC & LT Tires- Flat Spot

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

Appearance

Photos

slide26

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.

slide27

PC & LT Tires - Belt Separation

A bulge or split through the upper shoulder & tread area

Appearance

Photos

slide28

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.

slide29

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

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

Appearance

Photos

slide30

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.

slide31

PC & LT Tires- Ply Turn-up Separation

Circum cracks above the rim line area with cord exposed

Appearance

Photos

slide32

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.

slide33

PC & LT Tires –Torn Beads

Appearance

Bead toe rubber is torn or cut

Photos

slide34

Torn Beads

Probable Causes

- Poor mounting/demounting techniques with tire tools

and/or lubrication, forklift damage and poor tire handling

procedures

Preventions

  • Review mounting/demounting procedures and tire tools.
  • Ensure the tire beads are well lubricated.
  • Also check new tire handling procedures.
slide35

PC & LT Tires –Distorted Bead

Appearance

Local areas of distortion in the bead

Photos

slide36

Distorted Bead

Probable Causes

  • Improper use of tools, or incorrect techniques used
  • when mounting the tire.
  • - Improper or defective rim(bent or rusty rims)
  • Shipping/handling damage.

Preventions

  • Review mounting/demounting procedures and tire tools.
  • Use proper rim and ensure the tire beads are lubricated.
  • Also check new tire handling procedures.
slide37

TB Tires – Bead Area - Bead Deform & Burst

Circumferencial deformation and/or burst of the bead area

Appearance

Photos

slide38

Bead Area - Bead Deformation & Burst

Probable Causes

  • Rusty rims, improper bead lubrication, and bent or damaged
  • rims which result in improper bead seating.
  • Excessive heat in the bead area.

Preventions

  • Review mounting/demounting procedures and the use of
  • tire tools
  • - Ensure the tire’s beads are well lubricated.
slide39

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

Circumferencial cracks above the rim line area with cords exposed

Appearance

Photos

slide40

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.

slide41

TB Tires – Bead Area- Flow Crack

Circum cracks above the rim line area without cord exposed

Appearance

Photos

Crack

slide42

Bead Area - Flow Crack

Probable Causes

  • Improper rubber flow during the manufacturing process.
  • Aggravated by overloaded or underinflated condition.

Preventions

  • Ensure proper inflation pressure and loading condition.
  • - Consult with Kumho Engineer
slide43

TB Tires – Side Area - Carcass Separation

Separation between belt & carcass cords in tire shoulder area

Appearance

Photos

slide44

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.

slide45

TB Tires – Side Area - Vehicle Damage

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

Appearance

Photos

slide46

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.

slide47

TB Tires – Side Area - Weather Cracking

Appearance

Numerous small cracks in the rubber surface

Photos

slide48

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.

slide49

TB Tires – Side Area - Folklift Damage

Cut similar to impact damage on a brand new tire

Appearance

Photos

slide50

Side Area - Folklift Damage

Probable Causes

- Caused during handling procedures by folklift.

Preventions

- Inspect tire upon receipt.

slide51

TB Tires – Side Fatigue Rupture(Zipper crack)

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

Appearance

Photos

slide52

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.

slide53

TB Tires – Side Area - Radial Split

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

Appearance

Photos

slide54

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.

slide55

TB Tires – Side Area- Open Sidewall Splice

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

Appearance

Photos

slide56

Side Area - Open Sidewall Splice

Probable Causes

-Loss of adhesion in sidewall splice due to

manufacturing process.

Preventions

-Consult with Kumho Eng’r.

slide57

TB Tires – Tread Area - Belt Separation - I

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

Appearance

Photos

slide58

TB Tires – Tread Area - Belt Separation-II

A bulge or split through the upper shoulder & tread area

Appearance

Photos

slide59

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.

slide60

TB Tires – Tread Area - Chipping/Chunking

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

Appearance

Photos

slide61

Tread Area - Chipping / Chunking Tread

Probable Causes

  • - 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.

Preventions

- Review tire selection.

- Avoid overloading

- Use traction type of tires in drive axle.

slide62

TB Tires – Separation Due To Stone Drilling

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

Appearance

Photos

slide63

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.

slide64

TB Tires – Tread Area - Rib Tearing

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

Appearance

Photos

slide65

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.
  • Avoid overloading condition, high speed driving and sharp
  • cornering.
slide66

TB Tires – Tread Area - Heel & Toe Wear

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

Appearance

Photos

slide67

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.

slide68

Others - Run Flat (TB-R)

Advanced deterioration of the tire affecting 360⁰ of tire sidewall & inner liner

Appearance

Photos

slide69

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

Advanced deterioration of the tire affecting 360⁰ of tire sidewall & innerliner

Appearance

Photos

slide70

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.)

slide71

Others – Impact/Cut Damage

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

Appearance

Photos

slide72

Others – Impact/Cut Damage

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

Appearance

Photos

slide73

Others – Impact/Cut Damage

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

Appearance

Photos

slide74

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.

slide75

Others - Penetration/Repair Related Bulge

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

Appearance

Photos

slide76

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

slide77

Others - Penetration

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

Appearance

Photos

slide78

Others - Penetration

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

Appearance

Photos

slide79

Others - Repaired Tire

Repaired on the interior or exterior area of the tire

Appearance

Photos

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