DAF CF65, CF75, CF85 Series . Manual — part 995

©

200423

1-3

General

STEERED TRAILING SWIVEL AXLE

ΧΦ65/75/85 series

7

7

1.3 DESCRIPTION OF WHEEL HUB UNIT

Wheel hub unit
The wheel hub (2), wheel bearings (4) and (5)

and oil seal (6) form a whole that is called the

wheel hub unit.

The thrust washer (3), on the inner side of two

straight surfaces, prevents the hub nut (1) from

coming loose if there are any problems with the

bearings. The hub nut (1) is of the self-locking

type. The nut is locked by bending the lips on the

hub nut (1) outward.

The bearings (4) and (5) of the wheel hub unit are

greased and are maintenance free.

The correct wheel bearing pre-load is achieved

by installing the hub nut (1) as specified.

It is not possible to replace wheel bearings (4)

and (5) and/or hub oil seal (6).

;;;;;;

;;;;;;

;;;;;;

;;;;;;

;;

;;;

;;;

;;

;;

;;

;;

;

;

;

;

;

;;

;;

;

;

;

;

;

;;;;;;

;;;

;;;

;;

;

;;

;;

;

;

;

;

;

;

;;;;;;

;;;;;;

;;;;;;

;;;;;;

;;

;;;

;;

;;

;;

;;

;

;

;

;

;

;;

;;

;

;

;

;;;

;;;

;;;

;;;

;;;;;;

;;;;;;

;;;

;;;

;;

;

;;

;;

;

;

;

;

;

;

;

;

1

S7 00 578

5

6

2

4

3

STEERED TRAILING SWIVEL AXLE

1-4

©

200423

General

7

ΧΦ65/75/85 series

7

1.4 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

S7 00 606

©

200423

1-5

General

STEERED TRAILING SWIVEL AXLE

ΧΦ65/75/85 series

7

7

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.

S7 00 129

R

X Y

A

B

S7 00 125

STEERED TRAILING SWIVEL AXLE

1-6

©

200423

General

7

ΧΦ65/75/85 series

7

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.

S7 00 126