Mounting/Demounting Instructions UHP* and Run Flat Tyres** · Tyre characteristics • Examples of...
Transcript of Mounting/Demounting Instructions UHP* and Run Flat Tyres** · Tyre characteristics • Examples of...
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wdkwdkMounting/Demounting InstructionsMounting/Demounting Instructions
UHP* and Run Flat Tyres**
Attachment 2Summary of criteria
October
2007
* Aspect ratio ≤
45 % and speed symbol ≥
V** Pay attention to manufacturer‘s marks
Wirtschaftsverband der deutschen Kautschukindustrie e. V. page 1
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Tyre characteristicsTyre characteristics
•
Examples of criteria to judge on improper mounting or demounting
•
Evaluation•
Consequences
•
Preventive measures
Wirtschaftsverband der deutschen Kautschukindustrie e. V.
October
2007page 2
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PrefacePrefaceThis summary of characteristics shows examples of typical mounting and demounting features.
In case of visible damage which reaches as deed as to the ply, tyres will have to be discarded at any rate.
It is always possible that safety-related characteristics appear which are not listed here, but even exceed the criteria mentioned here –
this might depend on mounting /
demounting procedures and tyre types.
Evaluation of such characteristics is always up to a qualified professional.
In case of doubt, or in borderline cases, damaged tyres should always be discarded.
This summary is not exhaustive.
We decline any responsibility for contents and interpretation of
this summary.
Wirtschaftsverband der deutschen Kautschukindustrie e. V.
October
2007page 3
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Sketch and terminologySketch and terminology
Wirtschaftsverband der deutschen Kautschukindustrie e. V.
Side-wall
Radial carcassInner lining
Bead
Bead baseBead toeBead heel
Mounting guide rib
Conductive mixture
Electrostatic by-pass(BasePen procedure)
Reinforced Silica tread mixture
Aramid bead reinforcing layer
1st steel belt
2nd steel beltBead core
Helical nylon cord ply (JLB)
October
2007page 4
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Identification of tyre Identification of tyre characteristicscharacteristics
•
Clean tyre sidewalls, beads and inner liner with clean cloth
•
Make sure to illuminate the workplace properly
•
In order to check for deep damage (cut, scratches) use suitable tools such as a a round spatula
•
Mark damage with clearly visible crayons to make sure such spots
are easily relocated when re-examined
•
Make scrap tyres unusable
Wirtschaftsverband der deutschen Kautschukindustrie e. V.
October
2007page 5
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Characteristic: impression of rim flange at point of traction
Cause:
excessive tension during mounting procedure
Consequence: check tyre for leaks
Preventive measures: use suitable tyre changer and tools; apply sufficient lubricant in line with mounting instructions
Wirtschaftsverband der deutschen Kautschukindustrie e. V.
October
2007page 6
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Characteristic : overstretching of bead base at point of traction
Cause:
excessive tension during mounting procedure
Consequence: check tyre for leaksPreventive measures: use suitable tyre changer and tools; apply sufficient lubricant in line
with mounting instructions
Wirtschaftsverband der deutschen Kautschukindustrie e. V.
October
2007page 7
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Characteristic : bead toe slightly ripped
Cause: sharp-edged mounting head, sharp-edged rim flange
Consequence: if minor scratches are found in the rubber, tyre can be used again; if scratches reach as far as to the ply: discard tyre
Preventive measures: check / replace mounting head; add rim flange protection; use bead clamp, apply sufficient lubricant
Wirtschaftsverband der deutschen Kautschukindustrie e. V.
October
2007page 8
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Characteristic : bead base deformed at point of traction
Cause:
unsuitable bead clamps, not properly applied; tyre and bead clamps slip off
Consequence: check inner liner for damage (also see inner liner damages); check tyre for leaks
Preventive measures: correctly apply suitable bead clamp; avoid slipping off
Wirtschaftsverband der deutschen Kautschukindustrie e. V.
October
2007page 9
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Characteristic : bead base damaged as far as to the ply
Cause: high tension at point of traction during mounting procedure
Consequence: discard tyre
Preventive measures:
apply sufficient lubricant; add rim flange protection; use bead clamp
Wirtschaftsverband der deutschen Kautschukindustrie e. V.
October
2007page 10
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Characteristic : bead toe and bead base damaged
Cause: excessive tension during mounting procedure caused bead to slip off the mounting head
Consequence: discard tyre
Preventive measures: position mounting head properly; make sure core temperature does not fall below 15 °C minutes!
Wirtschaftsverband der deutschen Kautschukindustrie e. V.
October
2007page 11
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Characteristic : bead base torn off during demounting procedure
Cause:
bead already slightly damaged during mounting procedure
Consequence: discard tyre
Preventive measures: use suitable tyre changer and sufficient lubricant
Wirtschaftsverband der deutschen Kautschukindustrie e. V.
October
2007page 12
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Characteristic : bead heel damaged
Cause:
excessive friction at mounting head
Consequence: discard tyre
Preventive measures: use suitable bead clamp or hold-down device to avoid high tension; make sure bead is properly seated on mounting head;
apply sufficient lubricant
Wirtschaftsverband der deutschen Kautschukindustrie e. V.
October
2007page 13
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Characteristic : impression of tyre tool in bead base / bead heel
Cause:
tyre bead was levered over mounting head with unsuitable tyre lever and using excessive forces
Consequence: check tyre for leaks
Preventive measures: use suitable tyre lever; lever bead over slowly and without tensioning; apply sufficient lubricant
Wirtschaftsverband der deutschen Kautschukindustrie e. V.
October
2007page 14
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Characteristic : impression of tyre tool in bead base / bead heel, rips
Cause:
tyre bead was levered over mounting head with unsuitable tyre lever and using excessive forces
Consequence: discard tyre
Preventive measures: use suitable tyre lever; lever bead over slowly and without tensioning; apply sufficient lubricant
Wirtschaftsverband der deutschen Kautschukindustrie e. V.
October
2007page 15
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Characteristic : impression of tyre tool in bead base / bead heel so that even ply is ripped
Cause:
tyre bead was levered over mounting head with unsuitable tyre lever and using excessive forces
Consequence: discard tyre
Preventive measures: use suitable tyre lever; lever bead over slowly and without tensioning; apply sufficient lubricant
Wirtschaftsverband der deutschen Kautschukindustrie e. V.
October
2007page 16
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Characteristic : bead toe torn off
Cause:
sharp-edged mounting head not properly positioned; mounting procedure not stopped at once; excessive tension
Consequence: discard tyrePreventive measures: use suitable bead clamp, position mounting head properly;
avoid tension, stop mounting procedure at once when mounting head slips off
Wirtschaftsverband der deutschen Kautschukindustrie e. V.
October
2007page 17
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Characteristic : bead rubber layer separated as far as to the ply
Cause:
tyre lever not inserted as far as necessary and bead rubber layer damaged with tyre lever tip
Consequence: discard tyre
Preventive measures: use suitable tyre lever and suitable bead clamps, insert tyre lever far enough without using excessive forces
Wirtschaftsverband der deutschen Kautschukindustrie e. V.
October
2007page 18
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Characteristic : bead cover layer distorted during demounting procedure
Cause:
excessive tension on bead circumference during demounting procedure
Consequence: check tyre for leaks
Preventive measures: demount slowly and lubricate sufficiently
Wirtschaftsverband der deutschen Kautschukindustrie e. V.
October
2007page 19
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Characteristic : bead toe cut at point of traction
Cause: excessive tension, sharp-edged rim flange
Consequence: discard tyre when cut reaches as far as to the ply
Preventive measures: apply sufficient lubricant; add rim flange protection; use bead clamp
Wirtschaftsverband der deutschen Kautschukindustrie e. V.
October
2007page 20
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Characteristic : impression in inner liner over bead toe
Cause:
high tension at point of traction, caused by sharp-edged rim flange
Consequence: discard tyre when inner liner is torn
Preventive measures: mount tyre without tensioning; use rim flange protection in case of sharp-edged rim flanges; apply sufficient lubricant on inner liner
Wirtschaftsverband der deutschen Kautschukindustrie e. V.
October
2007page 21
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Characteristic : inner liner scratched by tyre lever
Cause:
tyre lever inserted too much during demounting procedure
Consequence: discard tyre when inner liner is torn
Preventive measures: use suitable tyre lever; do not insert too much during demounting procedure
Wirtschaftsverband der deutschen Kautschukindustrie e. V.
October
2007page 22
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Characteristic : inner liner scratched / slightly ripped below bead toe
Cause:
sharp-edged mounting head, excessive tension, not sufficient lubricant
Consequence: discard tyre when inner liner is torn
Preventive measures: use sufficient lubricant; check mounting head for sharp edges and replace, if necessary
Wirtschaftsverband der deutschen Kautschukindustrie e. V.
October
2007page 23
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Characteristic : bead heel and mounting guide rib damaged
Cause:
sharp-edged tyre lever forcibly inserted during demounting procedure
Consequence: check tyre for leaks; when damaged as far as to the ply, discard tyre
Preventive measures: use round tyre lever using less forces and apply sufficient lubricant
Wirtschaftsverband der deutschen Kautschukindustrie e. V.
October
2007page 24
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Characteristic : bead and core are deformed
Cause:
mounting head of tyre changer went too far, producing excessive tension
Consequence: check inner liner for damage and bead for broken core
Preventive measures: move mounting head to correct position; avoid tension caused by raising mounting head too much; apply lubricant on bead and inner liner
Wirtschaftsverband der deutschen Kautschukindustrie e. V.
October
2007page 25
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Characteristic : bead deformed, side-wall and belt edges bent
Cause:
bead breaker blade forcibly applied at fully depth
Consequence: discard tyre for risk of long-term damage caused by separation in tyre structure
Preventive measures: use bead breaker with limited stroke
Wirtschaftsverband der deutschen Kautschukindustrie e. V.
October
2007page 26
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Characteristic : deformation / compression of belt edge during mounting procedure
Cause:
unsuitable bead clamp
Consequence: discard tyre
for risk of long-term damage caused by separation in belt edge area, poor uniformity causes vibrations and affects smoothness
Preventive measures: use bead clamps / hold-down devices; do not press too deep
Wirtschaftsverband der deutschen Kautschukindustrie e. V.
October
2007page 27