Comar Tyre & Rubber Industrial Co., Ltd

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Tire Maintenance

Tire use cautions

AddTime:2014-05-19 Browse: 2485

    1. Scope

The basic requirements of the transport, storage, assembly and disassembly, pressure, load, maintenance of tyres are stipulated in this regulation.
This regulation is suitable to all kinds of tyre products of Comar.

2. Quoted standards
GB/T 2977-1997  "Truck tyres series"
GB/T 9768-2000  "The regulation of usage and maintenance of tyres"
GB/T 521-19993  "The overall measurement method of tyres"

3.Transport of tyre
3.1 Tyre must be placed vertically when they are transported (tube tyres should be inflated slightly), and it is not allowed to place tyres together with oil, inflammable objects and other chemical objects, and the tyre should be kept from direct sunlight or rain. When the tube is not packed separately, it should be placed in tyre and inflated slightly in order to keep touch with the internal edge of tyre and tie by rope more than two places.
3.2 Do not dismantle bead protection device and steel belt to avoid any injury to bead when transporting wrapped tubeless tyre.
3.3 It is not allowed to hang the tyre directly by rope, tackle. The non-metal broad ribbon is permitted. 
3.4 When using fork-lift to handle a tyre, use fork to lift up the tyre from its side, do not lift it up by inserting the fork into bead central hole.

4. Storage of tyre
4.1 Tyres should be stored in good condition of air warehouse and kept from direct sunlight. The temperature in the warehouse should be controlled between –100C~+300C and the relative humidity should be between 50% and 80%. The warehouse should be 1 meter from heat source, generating equipment and other ozone-generating place.
4.2 It is not allowed to place tyres together with oils, inflammable objects, acids and chemical objects.
4.3 To store the internal tubes and hung on half-circular shelves and the tyres should be changed regularly the surface of the internal tubes and hung on half-circular shelves and the tyres should be changed regularly the pivot point, at least once two months. It is not allowed to fold and pile them. To store the flaps specifically, it should be placed on circuital wooden shelves.
4.4 Tyres should be stored in lots according to production date or store date, first in and first out. Meanwhile, they should have store card to record the type, specification, structure, ply rating, brand, production date and store date.
4.5 Wrapped tyres should be stored with packages.

5. Assembling and disassembling of tyre
5.1 Tyres should be fixed on corresponding rims of stipulating in regulation.
5.2 The same axle should be assembled with tyres of the same specifications, structure, brands, size, ply rating and patterns.
5.3 When fitting tyres which have specified running direction, the running direction should be the same with the running direction to wheel.
5.4 All tyres of vehicles or the same axle should be replaced when replacing with new ones.
5.5 When assembling or disassembling the tube tyres, it should use the special tools.
5.6 When tubes are placed into tyres, the dirt should be cleaned from the internal of the tyres and the surface of tube, and apply some powder on the surface of the internal tube for their extent. The position of internal tube valve and rim valves should be kept together.
5.7 Assembly and disassembly to tubeless tyres
5.7.1 Before amount tyres, rim should be checked firstly for changing figure and crack. If there are some problems, rim should be repaired or replaced. The rust and other things should be cleaned from the surface of rim and tyres base and O circle groove before amounting tyres.
5.7.2 When dismantling or installing tyres with O-ring rims, need to make replacement with new O-ring. Before installing tyres, check if O-rings have defects and smear lubricant.
5.7.3 The bead disassembly machine and the tyre assembly device should be used before mount or dismount tyres. It is not allowed to jimmy and pound forcefully in order to avoiding damage the seal layer in tyre and bead. For the convenience of mounting tyres, it is advisable to apply neutral soap liquid or special antifriction on bottom of bead and the rim. It is not allowed to use any antifriction that can influence the quality of tyres.
5.8 Table of two tyres outside diameter permitted difference value range when off-the-road twin tyres are installed side by side.

 6. Load of tyre

6.1 The load of tyres should be suit with the current national standard.
6.2 The goods loaded by vehicle should be placed equably in order to avoid one tyre takes too much load (see figure 3 and figure 4).

7. Using pressure of tyre
7.1 The using pressure of tyre should be suit with the current national standard.
7.2 After mounting tyres, tubes should be inflated slightly firstly to make sure it can extend, then kept inflating till the pressure meets the regulation.
7.3 It is necessary to inspect if there is a leakage in the place of the valve pad and the valve rim touching with tyre after inflating the tyre.
7.4 Check air pressure at fixed time everyday, when finding air pressure reduction, add to standard air pressure in time.

8. The usage of tyre
8.1 The usage of tyre.
8.2 If you do not operate a vehicle for more than half year, please leave it in garage and jack it up.
8.3 The vehicle should be avoided violent acceleration and emergent brake to prevent from the damage of tyres.
8.4 If the vehicle is operated at high-speed for long distance or in summer, it is necessary to check the regularly and increase the stop times. If the tyre needs inflating, it must be done after decreasing the temperature of tyre. If the tyre becomes hot and the internal pressure is increasing, the vehicle should be stopped for releasing warm but not be emitted pressure and not be sprinkled cool water on it.
8.5 When chain up tyres, both sides should be chained. Take it off if chains are not necessary.
8.6 It is necessary to change the toe-in of the front tyre for different vehicles when mounting the bias tyres.
8.7 As soon as you find a radial tyre pierced you should take it off from vehicle to repair so as to prevent moisture getting into carcass, eroding steel cord and resulting in separation.
8.8 Radial tyres must strictly keep standard inflation pressure. Because of the reason of their structure, their subside level and contacting surface are bigger. Compared with the bias tyres, they are considered as inadequate inflation usually, so it is necessary to check with barometer.

 9. Maintenance of tyre

9.1 Tyres should be made first class maintenance with the vehicle. The main missions are to check inflation, wear of tyre surface and clean the stone and dirt and from the groove of pattern. To check if the tyre is mounted well and if the rim, fender circle and lock ring are well.
9.2 Tyre should be made second-class maintenance with the vehicle. If the outside tyres have outside damages, decortications or bulges. If the inner tubes have aging and damage appearances and the flaps have rift. The appeared problems should be recorded and resolved immediately. The measurement of the change of tyre treads wire, overall diameter and section width should be made as per GB/T521.These should be recorded and rotate the tyres.
9.3 The tyres should be rotated regularly as per appendix A ( standard appendix). When running 1200km-1500km, the rotation should be made and balancing the tyres.
9.3.1 Rotation of truck bias tyre
a The truck bias tyres should be rotated regularly as per appendix A (standard appendix). When running 8000km-10000km, the rotation should be made and balancing the tyre.
b It is necessary to use tyres without pollution of oil and other chemical materials in order to avoid tyres aging.
9.3.2 Rotation of agricultural tyres
When agricultural tyre finish a ride for a specific time (one season), rotate left tyre with right tyre, keep record of use, installing and dismantling, damage.
9.3.3 Rotation of off-the-road tyre
a Combine vehicle s grade-2 maintenance to conduct cross rotation of heavy-duty dump truck tyres.
b Nominal sectional width of off-the-road tyre are within the limits of 18.00-36.00, when one third of pattern depth of front wheel tyre wears off, rotate the front wheel tyre with rear wheel tyre. When outer diameter difference value of rear wheel coaxial twin tyres installed side by side is 10mm to 18mm, make rotation between twin tyres inside tyre and outside tyre.
c Avoid to be polluted by oils and chemical articles on the ground, prevent tyre too early aging.

10. Repair tyre
10.1 The tyres should often be checked. As soon as the damages are found, they must be repaired immediately.
10.2 The tyres should be stopped using when the tyres wear to wear mark.
10.3 The retreaded tyres should not be used as steering tyre in order for security of the vehicle.
10.4 Pay attention to the protection of tyres, remove rust from tyre s rim and smear antirust paint at regular intervals.