Genuine Volvo 780 Wheel Bearing

Volvo 780 Wheel Bearing Parts and Q&A

• Wheel Bearing
  384728
  Q: How to remove and install rear wheel bearings that are sealed, pressed-in units on Volvo 780?

  A:

  The rear wheel bearings are sealed pressed in units and no adjustment is available. For removal and installation, in order to avoid interference from the lifting arms, first start by loosening the rear axle nut while the vehicle is placed on all four wheels. Remove the wheels, followed by the brake caliper which should be hung out of the way by a piece of wire. Next, remove the brake disc and parking brake shoes, disconnect the parking brake cable from the wheel bearing housing and remove the retaining bolt for the support arm, knocking it loose. Proceed to remove the nut and bolt holding the lower link arm to the housing, and then the retaining bolt for the track rod, which can be removed using a small claw type puller. After the axle nut and the retaining nut for the upper link have been removed, the wheel bearing housing can be withdrawn as a whole, together with any shims that are in use. Mount the housing assembly in a vise, on a counterhold tool press out the hub, remove the circlip to press the bearing out, be sure to press against the inner race. Use a bearing puller to extract the inner race from the hub. For the installation, press the new bearing into the housing, and make sure to press the press tool only against the outer race, and then install the circlip. Support the inner race and press the hub into the bearing, and install the wheel bearing housing onto the housing, and secure the axle nut hand tight. Install the shims and retaining nut at the upper link and at the top push the housing outwards and tighten the upper link arm nut to the specified torque. Tilt the bearing housing where necessary to refit the lower link arm and its holding bolt, tightening it to the specified torque plus an extra number of rotations. Install the support arm and track rod, tightening to specified torque, re-install parking brake cable, brake shoes, brake disc and caliper and put the wheels back on and lower the vehicle. Finally, with all four wheels on the ground, tighten the axle nut to the specified torque + some rotation. For certain models, follow the same steps with some small changes in the process, making sure to mark the position of the brake disk, use the right tools for suspension compression and replace the bearing whenever the hub is pressed out. After installation, check all the connections are tightened to the specified torque values and that the parking brake is connected and adjusted.
• Hub Assembly
  271644
  Q: How to check and service wheel bearings on Volvo 780?

  A:

  To check for wheel bearing play, lift the vehicle and support it safely then rock the wheel at the 12 and 6 o'clock positions, if there is movement the wheel bearing should be serviced. For noise inspection, hold up the wheel off the ground and spin it by hand to listen if there is any noise, if it is still noisy after adjustment, it requires the wheel bearing to be replaced. The front wheel bearings on rear drive vehicles are not adjustable and if the lateral run-out on the hub is greater than 0.0012 inch (0.030mm) with the disc removed, the hub should be replaced. To remove and install, the first step is to raise and support the vehicle, remove the wheel(s) and brake caliper, remembering to hang it safely. Pry off the grease cap, remove the cotter pin and castle nut and extract the hub and brake disc assembly, using a bearing puller if necessary. Carefully tap out the grease seal and inner bearing race, and remove the outer bearing race. For installation, press in new inner and outer bearing races and pack the wheel bearing with grease and make sure the inner bearing seal is in the correct location. For hubs having separate brake discs, push the sealing ring against the spindle and install the inner bearing and sealing washer. Reinstall hub, outer race, castle nut and adjust bearing pre-load by spinning hub while tightening center nut to 42 ft. Ib (57 Nm), loosening half turn, tightening by hand to 12 inch lbs. (1.4 Nm). Install the cotter pin, making sure it is aligned with the spindle, then the protective cap, brake caliper, wheel and, finally, lower the vehicle.