DAF CF65, CF75, CF85 Series . Manual - part 979

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 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

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General

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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).

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 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

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Inspection and adjustment

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ΧΦ65/75/85 series

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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