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Section F
83 - 6
Drive Head - Assembly (cont'd)
9
To select the right size spacer 30, subtract the end float
obtained at step 7 from the solid spacer size (14.20
mm). Also subtract 0.04 mm to allow for theoretical
bearing tolerance and pre load. The result is the size of
spacer to be fitted from the solid spacer setting kit. If
there is no spacer of this size, fit the next nearest size
spacer, refer to Service Tools - Axles.
Example
Temporary spacer size
Subtract end-float
Total
Subtract tolerance & preload
Result
(No spacer available this size, use next nearest size
spacer i.e 13.900)
10
Remove sleeve B and temporary spacer. fit correct size
spacer from solid spacer setting kit, refer to Service
Tools - Axles. During removal take care to avoid
damaging the outer bearing.
11
Fit sleeve B. Tighten adapter C to no more than 50 Nm
to protect against bearing damage while spacer
selection is verified making sure the pinion is free to
rotate. Check there is no end float and pinion is free to
turn smoothly by hand. Remove adapter C and fit nut
16. Then check that rolling torque is less than 2.0 Nm. If
the rolling torque exceeds 2.0 Nm, check that the shaft
has been assembled correctly.
Note: If the pinion is not free to rotate check the correct size
spacer has been fitted.
If rolling torque measured at step 10 is too high, fit the
12
next larger size spacer. If rolling torque is too low, fit
the next smallest size spacer. If a correct spacer is not
available from the range, check that drive head is
assembled correctly.
13
Remove adapter C and sleeve B. Fit new oil seal 25,
grease between seal lips before fitting. Fit coupling
yoke 23 and NEW stake nut 22.
14
Progressively torque tighten stake nut 22, occasionally
rotating coupling yoke, up to 250 Nm. Providing the
correct size spacer has been selected the rolling torque
should be between 2.3 and 3.4 Nm including seal drag.
Note: The nut tightening torque can be increased to a
maximum of 300 Nm provided that the pinion rolling torque
does not exceed the maximum of 3.4 Nm.
15
Finally stake the nut 22 into the slot.
9803/3280
Transmission
Front Axle - SD70
14.20
0.25
13.95
0.04
13.91
Purchased from www.WorkshopManuals.co.uk
16
Assemble the trunnion pin B, bevel gears 14 and 16
and their thrust washers 15 and 17 into differential half
case 13.
17
Position differential half case 12 onto half case 13,
aligning
the
match-mark
Threadlocker and Sealer to the threads of bolts 7, then
fit and torque tighten to 56 Nm (42 lbf ft, 6 kgf m).
Check the gears for free rotation.
Fit crownwheel 20 using new Verbus Ripp bolts 19
18
tightened to 166 Nm (122 lbf ft, 16.9 kgf m).
Note: Verbus Ripp bolts must not be reused.
19
Insall the differential assembly 10 onto the drive head
carrier 2.
20
Press taper roller bearing cone 9 onto the spigot of
case half 13.
21
Fit bearing outer races 7 and 8, castellated nuts 5 and 6
to the drive head carrier 2.
22
Adjust castellated nuts 5 and 6 to give an increase in
input pinion rolling torque of between 1.36 - 2.5 Nm (12
- 22 lbf in) more than that recorded in Step 11.
23
Measure the backlash between crownwheel 20 and
pinion 24, which should be 0.17 - 0.28 mm (0.006 -
0.010 in). Adjust castellated nuts 5 and 6 by equal
amounts when altering backlash. When backlash and
preload are both correct, fit roll pins 3 and 4.
24
Check tooth marking to verify crownwheel and pinion
are set correctly, refer to Crownwheel and Pinion
Meshing.
Apply JCB Multigasket to the mating faces of drive
25
head carrier 2 and the axle casing. Fit the drive head
carrier to the axle casing with the crownwheel towards
the short drive shaft. Fit securing bolts 1 and tighten to
166 Nm (122 lbf ft, 16.9 kgf m).
26
Reassemble both driveshafts and hub assemblies, refer
to Axle Hub and Driveshaft - Dismantling and
Assembly.
27
Re-fill the hubs and differential with the correct grade of
oil, refer to Section 3 Lubricants and Capacities.
28
Refit the propshaft, refer to Propshafts - Removing
and Replacing.
Section F
83 - 6
letters.
Apply
JCB
Issue 1
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