83 - 6
Section F
9803/3280
Section F
83 - 6
Issue 1
Front Axle - SD70
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
14.20
Subtract end-float
0.25
Total
13.95
Subtract tolerance & preload
0.04
Result
13.91
(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.
12
If rolling torque measured at step 10 is too high, fit the
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.
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 letters. Apply JCB
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.
18
Fit crownwheel
20
using new Verbus Ripp bolts
19
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
.
25
Apply JCB Multigasket to the mating faces of drive
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
.
