Operation and maintenance manual

Section 140-0060
7
SM 2148 5-02
Note: The force required to maintain rotation should be
related in the following manner to determine
pre-load.
T = F x R, where:
T = Torque
F = Force to maintain rotation
R = Radius of secured cord
Pre-load obtained should be between limits of
1.7 - 2.8 Nm (15 - 25 lbf in).
If torque reading is less than 1.7 Nm (15 lbf in) then a
smaller outer spacer needs to be fitted.
If torque obtained is greater than 2.8 Nm (25 lbf in) then
a larger outer spacer needs to be fitted.
Note: If largest available combination of spacers
(10 & 11) is already fitted, then a defect must be
present in one or more parts of the assembly and
needs to be found and remedied before continuing
differential build.
4. When correct pre-load has been achieved, remove
helical gear (66) and end nut (67).
5. Apply Loctite 638 by brush to pinion (13) splines
and threads and also end nut (67) clamping face.
6. Install helical gear (66) and end nut (67). Lock
helical gear (66) using suitable tool.
7. Tighten end nut (67) to a torque of 1 085 - 1 220 Nm
(800 - 900 lbf ft) (See Fig. 6).
8. Lock end nut (67) in position by peening raised
collar of nut into slot cut in end face of pinion (13).
Differential Unit
1. If crownwheel (25) has been separated from
differential housing body (20) refit as follows:
a. Heat crownwheel (25) to a temperature of
approximately 150° C (300° F). This is necessary to
ensure that crownwheel fits onto register on differential
housing body (20).
b. Place crownwheel (25) into position on differential
housing body (20), ensuring that bolt holes and
matching marks line up.
c. Install two bolts (18) diagonally opposite, through
crownwheel and differential housing body (20) then
allow assembly to cool fully.
d. Install end flange (21) aligning matching marks and
grooves in end face with those in differential housing
body. Install remaining bolts (18) and nuts (22) then
tighten to a torque of 155 - 171 Nm (114 - 126 lbf ft).
2. Place assembly on bench with end flange (21)
downwards. Check tightness of studs (19) and if
necessary tighten to a torque of 19 - 22 Nm
(14 - 16 lbf ft).
3. Soak friction plates (28) in gear oil for at least 30
minutes prior to installing to ensure complete
impregnation. Lightly oil differential components before
assembly.
4. Install first thrust washer (26) into bore of end
flange (21).
5. Slide steel clutch plate (27) then friction plate (28)
into differential housing body (20), making sure that
they are free to move vertically in grooves.
Front Axle Group - Differential Drive Head
Fig. 9 - Pinion/Diff Wheel Arrangement
SM - 1182
SM - 1207
Fig. 8 - Measuring Thickness of
Clutch Plates and Diff Cage Half
TOTAL
THICKNESS
EQUAL AT BOTH
SIDES OF DIFF