20 SUSPENSION l Tighten the nut up to approx. 53mm. protrusion of the anchor bolt and fit the lock nut and tighten it. l Remove the jack, bounce the wheel to settle the suspension. l Measure the front chassis height from the ground, if it is not 550 + 3 mm. adjust it by torsion bar anchoring bolt. 7. WHEEL ALIGNMENT Following order is to be maintained while doing wheel alignment i) Camber angle ii) Caster angle iii) Toe-in iv) Wheel lock angle Caution Not following the above order will lead to incorrect wheel al ignment even though individual adjustments are done correctly. Note All adjustments for wheel alignment are to be done in UNLADEN CONDITION ONLY. Following precautions to be taken before commencing wheel alignment. l Vehicle should be unladen and parked on level surface. l Front tyre should have uniform wear and inflated to correct pressure. l Height of front LH & RH Hub cap centre from ground level should be equal (Counter check for even tyre wear and inflation). l Ensure that hub play is correct. (Refer front axle group) l Ensure that the silent bushes in the front suspension are in satisfactory condition. l Ensure that the front suspension fasteners are tightened to specified torque. l Ensure that there is no play in steering linkages and suspension ball joints. l Checking and adjusting the steering geometry is to be done in the proper order i.e. 1st camber followed by castor and then toe-in. Note In case wheel aligning system is available please follow instruction manual of manufacturer. 7A. CAMBER ANGLE ADJUSTMENT (Fig.22) l While adjusting camber angle nobody should sit inside the vehicle. l To adjust camber angle, add or remove shims between the chassis frame and the spindle of upper wishbone mounting. l Adding shims will reduce the camber angle and removing shims will increase the camber angle. Adjust camber angle to 00+ 30'. Note After addition or removal of shims tighten the bolts to 18 mkg Recheck the camber angle. 7B. CASTOR ANGLE ADJUSTMENT (Fig.22) l Adding shim at location ‘A’ will reduce the castor at location ‘B’ will increase the castor. Adjust caster angle to 30 + 30' as shown in (Fig. 22) l Check castor angle. If castor angle is not within 30 + 30' add only one shim of 0.8 mm thick at location ‘A’ or ‘B’ as shown in (Fig.22) Note LH/RH caster variation - 45' After adding shim tighten the bolts to 18 mkg. torque. Recheck the castor angle. 7C. TOE-IN ADJUSTMENT (Fig.23) l The reading at the front of wheel rim should be less than the reading at the rear of wheel rim by 2 to 5 mm. l Toe-in is adjusted by varying the length of tie rods after loosening their hex nuts. After adjusting the length of tie rods recheck toe-in and tighten back the hex nuts. Increasing length of tie rod will reduce the toe-in and vice-versa. While adjusting toe-in, adjust the length of both the tie rods by rotating them in the same direction such that their lengths remain equal at all times. Precautions To maintain the steering linkages symmetrical to the vehicle centre line, centralise the linkages i.e. the distance between chassis frame long member outside face and centre of centre link ball joint should horizontally equal (55 mm) at both RH & LH sides. Hold the steering wheel in this will ensure that when the wheels are in straight ahead position, the steering linkages will also be centralised.
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