Differential Output Shaft Bearing: Service and Repair

Remove output shaft assembly incorporating bearing to be removed. Service and Repair

Clean assembly and clamp caliper mounting bracket between suitably protected laws of vice.

Fig.11:

Fig.12:

Turn down tabs of lock washer and remove nut (1, Fig.11) from shaft using spanner SL 15A (Fig.12).

Remove and discard lock washer.

Fig.13:

Withdraw output shaft (1, Fig.13) from caliper mounting bracket (2, Fig.13). Collect inner bearing (3, Fig.13) and cone. Discard collapsed spacer (4, Fig.13).

Fig.14:

NOTE: If outer bearing remains on shaft and pushes oil seal out of caliper mounting bracket on withdrawal, remove it from shaft using tool SL 47-3/1, 47 (1, Fig.14).

Pry oil seal from caliper mounting bracket. Collect outer bearing and cone. Discard oil seal.

Fig.13:

Using a suitable drift. gently tap bearing cups (5, Fig.13) out of housing. Remove caliper mounting bracket from vice and carefully clean internally.

NOTE: When bearings are to be renewed, always replace complete bearings. Never fit new cone and roller assemblies into used cups.

Before fitting, bearings should be lightly greased, but it is most important that at least 4 cc of hypoid oil is added to the cavity between the bearings during assembly, and that the oil seal is lubricated by packing the annular space between its sealing edges with grease. This prevents premature seal or bearing wear before oil flow begins from the axle centre.

Refitting

Press cups of replacement bearings into housing, using suitable press and adaptors to ensure that cups are pressed fully home in housing

Place roller and cone assembly of outer bearing (already greased) in position.

Fig.15:

Press replacement oil seal into position (1, Fig.15) ensuring that spring-loaded sealing edge is adjacent to bearing. Load seal with grease between sealing edges.

Clamp caliper mounting bracket between protected jaws of vice.

Check that four special bolts for brake disc are in position in output shaft flange and enter shaft through seal and outer bearing.

Fit new collapsible spacer and fill the space between hearings with Hypoid EP 90 oil before replacing rollers and cone of inner bearing and fitting new lock washer on shaft.

Place nut on shaft, grease face next to washer and tighten finger-tight only.

Using spanner SL15A and a 'tommy-bar' at disc attachment bolts to oppose torque, tighten nut on shaft Just sufficiently to almost eliminate play from bearings. Torque required to turn shaft should be 0.14 to 0.28 kgf/m (10 to 20 lbf/in).

Further tighten nut, very slightly (not more than a thirty-second of a turn about 5 mm (3/16 In) at perimeter of nut) and re-check torque required to turn shaft. Continue to tighten nut in very small increments. turning shaft to seat bearings and measuring torque after each increment, until correct figure is reached.

CAUTION: If torque required to turn shaft exceeds by more than 0.28 kgf/m (20 lbf/in) torque recorded in first check, it is necessary to dismantle assembly, discard collapsed spacer and rebuild with new collapsible spacer. It is not permissible to slacken back nut after collapsing spacer as bearing cones are then no longer rigidly clamped.

Turn down tab washers in two places to lock nut and remove assembly from vice. Refit output shaft assembly to final drive unit. Service and Repair