20
DISASSEMBLY
**The reference numbers in this section correlate to the drive unit exploded view (Figure D) in the “Parts List Diagrams”
section of this manual.
1. Remove the twelve socket head cap screws (17) and washers (16) from the cover (14).
2. Lift the cover (14) off of the assembly. The thrust washer (13) usually remains with the cover.
3. Lift the sun gear (12) from the secondary carrier assembly (11).
4. Remove the secondary carrier assembly (11) from the ring gear (10).
5. Remove the ring gear (10) from the hub (6).
6. One tab of the lock washer (8) will be engaged in a slot of the bearing nut (9). Bend the tab back to release the lock
washer (8). Remove the bearing nut (9), lock washer (8) and thrust washer (7).
**A special locknut wrench (Part #: 613A) is required for the removal of the bearing locknut. Contact Auburn Gear
for procurement of this wrench and other service tools.
7. Care should be taken to avoid damaging the splines and threads on the shaft (1).
**The bearing cone (3) has been designed with a slip fit with respect to the shaft (1).
8. Remove the seal (2) and bearing cones (3) from the hub (6). Inspect the bearing cups (4) in the hub (6) and remove
them only if replacement is required.
ASSEMBLY
**The reference numbers in this section correlate to the drive unit exploded view (Figure D) in the “Parts List Diagrams”
section of this manual.
1. Press new bearing cups (4) in each side of the hub (6). It is recommended that the bearing cups (4) and bearing
cones (3) be replaced in sets.
2. Assemble the outer bearing cone (3) into the bearing cup (4) at the seal end of the hub (6) and press a new seal
(2) into the hub (6).
3. Lubricate the shaft oil seal (2) and lower the hub (6) onto the output shaft (1). Keep the hub (6) centered to prevent
damage to the oil seal.
**On heavy duty seals, there is to be no lubricant on the seal (2), output shaft (1) or hub (6).
4. Assemble the inner bearing cone (3) over the output shaft (1). Place the bearing cone (3) over the output shaft
bearing journal. Press the bearing cone (3) down until the rollers just touch the bearing cup (4). Take care to avoid
pressing the bearing cone (3) too far.
5. Install the thrust washer (7) with the tab in the keyway of the output shaft (1) and lock washer (8).
6. Install the lock nut (9) and tighten to 30 ft-lbs (41 Nm). Rotate the hub clockwise twenty turns then counter-clockwise
twenty turns. Tighten the lock nut (9) to 50 ft-lbs (68 Nm). Repeat the hub rotation process in this step and then
tighten the lock nut (9) to 70 ft-lbs (95 Nm).
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