SUSPENSION 45 1.10.6. BALANCING WHEELS: Dynamic balance, as shown in is the equal distribution of weight of each side of the wheel center line so that when the tyre spins there is no tendency for the assemble to move from side to side. Wheels that are dynamically unbalanced may cause shimmy. GENERAL BALANCE PROCEDURES: Deposits of mud, etc. must be cleaned from inside of rim. WARNING: Remove stones from tread, clean the tyre and rim before balancing for safety to achieve better results. Each tyre should be inspected for any damage, and then balanced according to equipment manufacturer’s recommendation. OFF-VEHICLE BALANCING: Most electronic off vehicle balancers are more accurate than the on-vehicle spin balancers. They are easy to use and give a dynamic (two plane) balance. Although they do not correct for drum or disc unbalance as does on vehicle spin balancing, this is overcome by their accuracy. NOTES:- 1. Permissible imbalance for assembly tyre with rim, 95 gmcm Max. 2. Total balance weight should be within 140 gm on each side. 3. Do not use more than one balance weight on one side. 1.10.7. TYRE CARE: Repairing a Tyre: Mark the tyre position (if original color dot mark is not visible) with respect to valve stem hole to ensure that the tyre is refitted in the original location on the wheel rim. Ensure that balancing weights are not disturbed during removal of tyres. Check the balance weight prior to the removal of the tyre. If found loose, mark its location on the rim & refit properly. Balance the wheel after every dismantling and assembly of tyre on the wheel rim. While fitting wheels on the vehicle ensure that wheel pins are free from dust, scratches, dirt, dents, etc. NOTE: Do not apply any oil on the wheel pins. Wipe off the oil if present. SPECIAL CARE FOR TUBELESS TYRES: 1. While removing tyre from wheel rim and mounting it back on wheel rim, take precautions not to damage tyre bead. Use tyre removal and assembly machines. Damage or cut on tyre bead may cause gradual loss of air and deflation of tyre. 2. Do not scratch inside of tubeless tyre with metallic or sharp object. Tubeless tyres are coated with impermeable layer of rubber from inside which holds the air inside the tyre. Removal of this layer due to scratching may cause gradual loss of air and deflation. 3. If wheel rim gets damaged in service, get the wheel rim repaired/replaced immediately. Running the vehicle with damaged rim may cause deflation of tyre and subsequent dislodging of tyre from rim. 4. Maintain recommended inflation pressure. Over- inflation, in particular, may cause puncture or bursting of tyre. NOTE: Life and wear pattern of tyres depends on various parameters like tyre pressure, wheel alignment, wheel balancing, tyre rotation, etc. It also largely depends on vehicle speed, load carried, usage, driving habits, road conditions, tyre quality, etc. In case fault is suspected to be due to poor quality of tyres, the same may be taken up with concerned tyre manufacture
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