DAF CF65, CF75, CF85 Series . Manual — part 978

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200423

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General

FRONT AXLE/LEADING REAR AXLE

ΧΦ65/75/85 series

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1.5 DESCRIPTION OF WHEEL SETTINGS

Caster
The caster (Z) is the angle of the axle housing to

the road surface. The caster is important for the

directional stability of the vehicle. Too little caster

will lead to "searching" behaviour by the vehicle,

while too much caster will result in "heavy"

steering.

A deviating caster will not result in tyre wear.

The caster is determined by the relation between

the road surface and the chassis, assuming that

the chassis is parallel with the road surface.

The caster can be very easily inspected and

adjusted and requires no complicated equipment.

If a vehicle has two steerable axles, this

inspection should be carried out on both axles.

Z

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ΧΦ65/75/85 series

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Camber angle and king pin inclination
The camber angle (X) and the king pin

inclination (Y) are determined by the construction

of the swivel axle and the axle housing. In DAF

vehicles, neither setting can be adjusted.

Wheel alignment deviations can only be caused

by collisions and/or a bent front axle due to

overloading.

If a vehicle has a deviation in one of these wheel

alignments, the load of the tyre will be unevenly

distributed across the road surface. This will

result in irregular tyre wear.

Inspections of vehicles with one steerable axle

and vehicles with two steerable axles do not

differ. The inspection should be carried out on

each individual wheel.

Toe
Toe is the difference between distances A and B.

If distance A is smaller than B, this is called toe-

in. If, however, distance A exceeds distance B,

this is called toe-out.

Whether a vehicle should have toe-in or toe-out is

determined by the manufacturer of the vehicle.

Toe-in or toe-out is required to ensure that the

wheels have perfect rolling characteristics while

the vehicle is driving straight ahead.

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R

X Y

A

B

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©

200423

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General

FRONT AXLE/LEADING REAR AXLE

ΧΦ65/75/85 series

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6

Toe-in or toe-out deviations will cause "chafing"

of the tyres on the road surface. This will result in

irregular tyre wear.

The same irregular tyre wear is found in vehicles

with multiple steerable axles if the wheels are

"misaligned" while the vehicle is driving straight

ahead.

Toe-out when turning
Toe-out when turning is the difference in the

wheel alignment angle between the individual

wheels when the vehicle is making a turn.

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ΧΦ65/75/85 series

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In order to achieve proper rolling of the wheels in

the turn, it is necessary that the direction of wheel

rotation is at right angles to the turning radius

ending in the point the vehicle is turning around.

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