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jack up the front of the tractor and place on jack stands. Remove the cover and drive axle . remove the wheel. treat the hub as a heavy truck rear end assembly as it will be the same principle as to positioning of the bearings and adjustment.
Yes, the wheel bearing play is adjustable on your vehicle. It is not really hard to do, however it requires special tools (pullers) to remove the hub assembly cover without damaging things.
The 84 RX7 has a hub/ rotor assembly. Pull the front wheels, take off the calipers, remove the grease cap from the rotor, take out the cotter pin, take off the nut, pull the hub/rotor off. It may be difficult but pry the old bearings out, there is an outer and an inner, the inner has a seal on it. Clean out the space where there old bearings were, and press in the new ones, this will also be difficult. Make sure to use a method that puts even pressure on the bearings; I like to use a screwdriver that will fit through the hole in the bearing but the handel will catch, then I tap on the back of the screwdriver until the bearing seats in place. Be sure to pack the bearings with plenty of grease, you will make a mess. Then installation is just reverse of removal. When you put the hub nut back on, tighten it down, then back it off just a tiny bit so that it lets the bearing spin but doesn't have any play. As always, double check all of your lug nuts when your put your wheels back on. Hope this helps!
NOTE: After the wheel bearings have been removed or replaced or the front axle has been reassembled be sure to adjust wheel bearing preload. Refer to the Adjustment service procedure below. On the 1989–92 240SX there is just one wheel bearing, pressed into the hub and no adjusting cap. Refer to the exploded views of the Front Axle Hub Assembly. Review the complete service procedure.
Raise and support the vehicle safely.
Remove the front wheels and the brake caliper assemblies.
NOTE: Brake hoses do not need to be disconnected from the brake caliper assemblies. Make sure the brake hoses are secure and do not let caliper assemblies hang unsupported from the vehicle.
Work off center hub cap by using thin tool. If necessary tap around it with a soft hammer while removing.
Pry off cotter pin and take out adjusting cap and wheel bearing lock nut.
Remove wheel hub with disc brake rotor from spindle with bearings installed. Remove the outer bearing from the hub.
Remove inner bearing and grease seal from hub using long brass drift pin or equivalent.
If it is necessary to replace the bearing outer races, drive them out of the hub with a brass drift pin and mallet.
Install the outer bearing race with a tool (KV401021S0 special tool number) until it seats in the hub flush.
NOTE: Place a large glob of grease into the palm of one hand and push the bearing through it with a sliding motion. The grease must be forced through the side of the bearing and in between each roller. Continue until the grease begins to ooze out the other side through the gaps between the rollers. The bearing must be completely packed with grease.
Pack each wheel bearing with high temperature wheel bearing grease. Pack hub and hub cap with the recommended wheel bearing grease up to shaded portions. Refer to the illustration.
Install the inner bearing and grease seal in the proper position in the hub.
Install the wheel hub with disc brake rotor to the spindle.
Install the outer wheel bearing, lock washer, wheel bearing lock nut, adjusting cap, cotter pin (always use a new cotter pin and O-ring for installation after adjustment), spread cotter pin then install the O-ring and dust cap.
Install the brake caliper assemblies and bleed brakes if necessary. Install the front wheels.
Raise the vehicle. Refer to Vehicle Lifting in General Diagnosis.
Remove the wheel and the tire. Refer to Tire and Wheel Removal and Installation in Wheels, Tires and Alignment.
Remove and support the brake caliper. Refer to Brake Caliper Replacement (Front) or Brake Caliper Replacement (Rear) in Brakes.
Remove the brake rotor. Refer to Brake Rotor Replacement in Disc Brakes.
Remove the ABS sensor wire connector.
Remove the four bolts from the control arm.
Remove the hub and bearing from the control arm.
Remove the brake shield from the control arm.
Clean the control arm face and the bore before installing the hub and the bearing.
Installation Procedure
Notice: Refer to Fastener Notice in Service Precautions.
Install the brake shield and the hub and the bearing to the control arm with the four bolts. Be careful not to drop the hub and the bearing, as it could be damaged. Reconnect the ABS sensor. Tighten the hub and bearing bolts to 70 Nm (52 ft. lbs.).
Install the brake rotor. Refer to Brake Rotor Replacement in Disc Brakes.
Install the brake caliper. Refer to Brake Caliper Replacement (Front) or Brake Caliper Replacement (Rear) in Disc Brakes.
Install the wheel and the tire. Refer to Tire and Wheel Removal and Installation in Wheels, Tires and Alignment. Tighten the wheel nuts to 140 Nm (100 ft. lbs.).
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