Rotor

Removal

1. Remove the disc brake caliper (2B120). Refer to Caliper in the Removal and Installation portion of this section.

2. Remove the axle shaft (4234). Refer to the Disassembly and Assembly portion of Section 05-02E.

   Rear Disc Brake Assembly

   

   Item	Part Number	Description
   1	1012	Lug Nut
   2	1007	Wheel
   3	1109	Rear Hub and Rotor Assembly
   4	2B120	Disc Brake Caliper
   5	4001	Dana Full-Floating Axle — Model 80
   6	4A140	Axle Shaft-to-Rear Hub Bolt
   7	1001	Rear Wheel Gasket
   8	1239	Outer Bearing Cup
   9	1243	Inner Bearing Cup
   10	1175	Inner Hub Seal
   11	1244	Rear Wheel Bearing Inner Cone and Roller
   12	1240	Rear Wheel Bearing Outer Cone and Roller
   13	1A124	Hub Nut
   14	4234	Axle Shaft
   A	—	Tighten to 190 Nm (140 Lb-Ft)
   B	—	Tighten to 113-153 Nm (84-112 Lb-Ft)
   C	—	Tighten to 68-82 Nm (51-60 Lb-Ft). Back Off 90 Degrees and Retighten to 41-54 Nm (31-39 Lb-Ft) While Rotating Rear Hub and Rotor Assembly.

3. NOTE: Press in on the tool to disengage the nut ratchet.

   Remove the wheel bearing hub nut using Hub Locknut Wrench T88T-4252-A, so that the drive tangs engage the four slots of the hub nut.

   

   Item	Part Number	Description
   1	—	Valve Stem Alignment Pin (Dual Rear Wheel Only) (Part of 1109)
   2	—	Wheel Pin Locating Hole (Part of 1109)
   3	—	Slot (Part of 1A124)
   4	—	Drive Tang (Part of T88T-4252-A)
   5	T88T-4252-A	Hub Locknut Wrench
   6	1A124	Hub Nut
   A	—	Tighten to 88-102 Nm (65-75 Lb-Ft) while rotating hub. After tightening, ratchet back 90°, then tighten to 20-27 Nm (15-20 Lb-Ft). The maximum torque to rotate the hub is 2-3 Nm (18-27 Lb-In). Wheel end play is 0.00mm (.000 In.).

4. Remove the outer rear wheel bearing cone and roller.

5. Protect the rear axle spindle threads with cardboard tubing, tape or equivalent.

6. Remove the rear hub and rotor assembly using care not to damage the rear axle spindle threads.

7. With the rotor facing upward, secure the rear hub and rotor assembly in a vise with protective jaw caps.

8. Remove the ten rotor-to-rear hub bolts and remove the rotor from the rear hub (1109).

Installation

1. Position the rotor on the rear hub.

2. Install the ten rotor-to-rear hub bolts. Tighten to 113-153 Nm (84-112 lb-ft).

3. Protect the rear axle spindle threads with cardboard tubing or tape.

4. Carefully position the rear hub and rotor assembly on the rear axle spindle. Remove the thread protection.

5. Install the outer wheel bearing cone and roller and start the bearing hub nut making sure the hub nut tab is properly located in the keyway prior to thread engagement.

   

6. NOTE: This procedure is intended to prevent side-to-side end play of the hub and rotor assembly. To verify that there is no side-to-side end play, use a dial indicator magnetically mounted to the spindle end with the indicator on the outboard surface of the hub.

   Position the Hub Locknut Wrench T88T-4252-A so that the drive tangs of the tool engage the four slots of the nut. Apply inward pressure to the socket to separate the ratcheting components of the nut, tighten to 88-102 Nm (65-75 lb-ft). Back off 90 degrees, then retighten to 20-27 Nm (15-20 lb-ft). Rotate hub occasionally while tightening to seat the bearings.

7. Prior to installation of the axle shaft, clean and remove any debris in the hub bolt holes.

8. Inspect axle shaft for:

   • cracked material around the holes
   • oversized holes

   Replace axle shaft if any of these conditions exist.

9. Install the axle shaft and rear wheel gasket (1001).

10.  CAUTION: Do not tighten the axle shaft-to-rear hub bolts until the lug nuts (1012) are tightened to specification.

    Using new axle shaft-to-rear hub bolts, coat the bolt threads with a suitable thread adhesive and install the bolts only until they seat.

11. Install the disc brake caliper. Refer to Caliper in the Removal and Installation portion of this section.

12. Install the wheels (1007).

13. Remove safety stands and lower the vehicle to the floor.

14. Tighten the lug nuts to 190 Nm (140 lb-ft).

15. Tighten the axle shaft-to-rear hub bolts to 113-153 Nm (84-113 lb-ft).