Operation and maintenance manual

Front Axle Group - Differential Drive Head
6
Section 140-0060
SM 2148 5-02
2. Press inner bearing cone (12A) onto pinion (13). If
original pinion (13) and bearings (12 & 64) are being
refitted, install original spacers (10 & 11) onto pinion.
Note: If new parts are being fitted, install the largest
available spacers (10 & 11). This is to ensure that the
bearing cannot be over pre-loaded, preventing bearing
damage.
3. Press inner and outer bearing cups (12 & 64) into
bearing housing (63), hard against abutment shoulders.
4. Insert pinion assembly into bearing housing (63) and
secure with outer bearing cone (64A).
5. To obtain correct position of pinion relative to
crownwheel, shim (62) thickness is worked out using
formula 8.636 mm + A mm + B mm + C mm
(0.34 in + 0.00A in + 0.00B in + 0.00C in) where as:-
8.636 mm (0.034 in) shims selected as nominal.
‘A’ - Select shim thickness equivalent to figure
stamped on end face of pinion (13).
‘B’ - Select shim thickness equivalent to figure
stamped on gear casing (17).
‘C’ - Variation in bearing height from 44.653 mm
(1.758 in) ref. dimension.
6. Place shim pack on inner face of bearing housing
(63) then install assembly into gear casing (17).
Secure assembly in position by installing setscrews
(65) and evenly tighten to a torque of 98 - 109 Nm
(72 - 80 lbf ft).
7. Install helical gear (66) and end nut (67) onto
pinion (13).
8. Lock helical gear with suitable tool and tighten end
nut (67) to a torque of 1 085 - 1 220 Nm (800 - 900 lbf ft)
(See Fig. 6).
Setting Pinion Bearing Pre-Load
1. Shock load spiral bevel pinion bearings.
2. Secure length of cord to helical gear (66) and attach
free end to spring balance.
3. Wrap cord around OD of helical gear (66) and pull
on spring balance to rotate pinion (13) (See Fig. 7).
Note the force required to maintain rotation, ignoring
initial starting force.
Fig. 5 - Peening Pinion Nose Bearing
SM - 1206
SM - 1180
Fig. 6 - Tightening Helical Gear Nut
SM - 1181
Fig. 7 - Measuring Force for Bearing Rotation
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