The balljoint is not available separately to the control arm but, if defective, the control arm/balljoint assembly will need renewing. To start removal, slacken the driveshaft retaining bolt, loosen the wheel nuts and then raise and support the front of the car and remove the roadwheel and engine undershield. Next, remove the driveshaft retaining bolt and discard it (a new one will be required during reassembly). Loosen the nut until it is level with the end of the balljoint shank and use a balljoint separator tool to remove the suspension control arm balljoint from the hub carrier by using an Allen key in the end of the balljoint shank to prevent rotation while loosening the nut. Use a stout bar to lever the control arm downwards and over the end of the balljoint shank, taking care not to damage the balljoint dust cover. Undo the two bolts holding the control arm back mounting and the one bolt holding the front mounting and work the control arm from underneath the car, removing the bolts as new ones will be required. For overhaul, thoroughly clean the control arm and the area around the mountings and inspect the arm for cracks, damage or distortion and carefully check the inner pivot bushes for swelling, cracks or deterioration of the rubber. If both bushes need renewal, it is recommended to seek the help of a Volvo dealer or specialist as a hydraulic press and appropriate spacers are necessary for removing and refitting the bushes along with a setting gauge to measure the correct positioning of the bushes. For refitting, locate the arm in its mountings, and fit the new mounting bolts, tightening them to the specified torque. Engage the balljoint shank in the control arm, and tighten the new nut to the specified torque, the rest of the refitting process being a reversal of the removal steps.