DAF CF65, CF75, CF85 Series . Manual — part 979
©
200423
1-9
General
FRONT AXLE/LEADING REAR AXLE
ΧΦ65/75/85 series
7
6
To make certain that the toe-out when turning is
correct, the construction of the track rod and the
track rod arms should comply with a certain
principle: the Ackermann principle. According to
the Ackermann principle it should be possible to
draw an imaginary line from the centre of the king
pin right through the centre of the track rod ball
joint to the centre of the rear axle(s).
The drawing clearly shows that in vehicles with
two steerable axles, both axles should comply
with the Ackermann principle. By trying different
track rods and track arms, it is possible to comply
as closely as possible with the Ackermann
principle.
If the wheelbase has been shortened or extended
it may be necessary to adjust the track rod and
track arms in order to comply with the Ackermann
principle.
The toe-out when turning cannot be adjusted.
However, it is possible and necessary to check
and adjust the maximum wheel deflection of the
inside wheel, to prevent the tyres from chafing
against certain components.
Once the maximum wheel deflection is set, this
will also determine the deflection for the other
wheel or wheels, if the vehicle concerned has two
steerable axles.
S7 00 123
FRONT AXLE/LEADING REAR AXLE
1-10
©
200423
General
6
ΧΦ65/75/85 series
7
Wheel alignment in vehicles with multiple
steerable axles
To prevent premature tyre wear, all wheels
should be aligned while the vehicle is driving
straight ahead. If the wheels are misaligned, the
wheels of vehicles with multiple steerable axles
will be particularly prone to abnormal and
premature wear. Misalignment of steerable
wheels can be caused by various factors.
It may happen, however, that the steerable
wheels are properly aligned but that other factors
have caused abnormal tyre wear.
The main cause of this phenomenon should be
sought in the axle suspension, especially
suspension of the rear axle(s).
©
200423
2-1
Inspection and adjustment
FRONT AXLE/LEADING REAR AXLE
ΧΦ65/75/85 series
7
6
2. INSPECTION AND ADJUSTMENT
2.1 INSPECTION AND ADJUSTMENT, SWIVEL AXLE PLAY
Inspection of swivel axle play
1.
The vehicle should have its wheels on the
ground.
Note:
If the wheels have been removed from the
front axle, e.g. for overhaul purposes, the
swivel axle will hang at the axle end.
In that case, the swivel axle should be
supported by a jack, pushing the swivel axle
against the bottom of the axle end.
2.
Using a feeler gauge measure the distance
between the shim and the swivel axle at (A).
Take measurements in several places.
Compare the reading with the admissible
play. See 'Technical data'.
Note:
The play should be about equal along the
entire circumference of the axle end. If the
play is not equal, this is caused by radial play
in the needle bearings. If the radial play of
one of the values measured along the
circumference differs from the specified
value, the needle bearings should be
replaced, see the chapter 'Removal and
installation'.
If an excessive axial play is measured along
the entire circumference of the axle end, this
is probably caused by a worn swivel axle
thrust bearing.
Adjusting the swivel axle play, thrust bearing,
split version
1.
Remove the swivel axle from the axle end.
See 'Removal and installation'.
2.
Degrease and clean the thrust bearing.
3.
Check the thrust bearing for wear or
damage. If in doubt, replace the thrust
bearing.
4.
Check the machined surfaces of the axle end
and the swivel axle for damage.
A
S7 00 579
FRONT AXLE/LEADING REAR AXLE
2-2
©
200423
Inspection and adjustment
6
ΧΦ65/75/85 series
7
5.
Remove the dust seal (1) from the thrust
washer (2).
6.
Assemble the thrust bearing without
greasing it and without the dust seal (1).
Make sure that the cam at the bottom of the
bearing ring (3) falls in the recess of shoulder
ring (4). See the arrows in the drawing.
7.
Fit the swivel axle with its original shim on the
axle end.
8.
Fit the king pin. Hand tighten the nut.
9.
Place a jack under the swivel axle, pushing
the thrust bearing against the axle end.
10. Using a feeler gauge measure the gap
between the shim and the swivel axle.
If necessary, use a shim with a different
thickness until the specified axial play is
achieved. See 'Technical data'.
Note:
The shim thickness can also be determined
using the formula in the drawing.
S7 00 114
3
2
1
4
S7 00 815
B
D
A
A=B-(C+D+E)
E
C
A
= shim thickness
B
= distance between the swivel axle
contact surfaces
C
= total thickness of the thrust bearing
without the dust seal
D
= axle end dimensions
E
= play
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