DAF CF65, CF75, CF85 Series . Manual - part 983

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Inspection and adjustment

FRONT AXLE/LEADING REAR AXLE

ΧΦ65/75/85 series

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2.8 INSPECTION AND ADJUSTMENT, STEERABLE FRONT AXLES AND 

LEADING REAR AXLE ALIGNMENT

Inspection of the steerable front axles and 
leading rear axle alignment
-

Use high-quality wheel alignment equipment 

for the inspection. The equipment must be 

calibrated regularly and preferably be of the 

type that can be calibrated before every use.

-

The vehicle load must be in accordance with 

the vehicle's normal load conditions. The 

load should be at least 40% of the vehicle's 

admissible load.

-

For a vehicle combination (truck with trailer, 

or tractor with semi-trailer), the alignment of 

the total vehicle combination must be 

checked. A misaligned trailer or semi-trailer 

can cause the combination to become 

directionally unstable.

-

Before measuring, the following points 

should be checked:

-

the track of the steerable axles

-

the axle position of the non-steerable 

axles

-

tyre pressure

-

spring opening of the spring

-

play of the steering gear, if any

-

play of the axle suspension.

Note:

If a deviation is found, it should be corrected/

repaired before the measurement is taken.

-

The work should be carried out very 

precisely. The wheel alignment (the angle of 

the wheel in relation to the central axis of the 

chassis) should be calculated in millimetres 

per metre.

This wheel position is calculated by dividing the 

difference (in millimetres) in the readings on the 

measuring boards (a - b in the drawing below) by 

the distance (in metres) between the measuring 

boards (L in the drawing).

FRONT AXLE/LEADING REAR AXLE

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1.

Drive the vehicle straight to the test location 

to avoid stresses in the chassis or in the axle 

suspension system.

2.

Place the vehicle on the turning plates.

Only use turning plates which allow for wheel 

displacement caused by the wheel offset.

3.

Place chocks before and behind the non-

steerable wheels.

Block the vehicle so that it cannot 

slide off the turning plates.

4.

Place the steering gear in the central position 

using the markings on the steering box.

S7 00 093

S7 00 024

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Inspection and adjustment

FRONT AXLE/LEADING REAR AXLE

ΧΦ65/75/85 series

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5.

Measure the angle of the idler arms in 

relation to the chassis (the angles A, B and C 

in the drawing).

Compare the angles measured with the 

specified angles. See 'Technical data'. If 

these deviate, trace the cause and set the 

angles correctly.

Note:

If a large deviation is measured, the cause 

should be traced. The deviation could, for 

example, have been caused by a collision, 

during which a steering rod and/or idler arm 

were bent.

6.

Fit alignment equipment to the steerable 

axles.

7.

Calibrate the alignment equipment, if 

possible.

8.

Consult the alignment equipment manual 

and follow the instructions given there.

Note:

The drawings show the alignment 

equipment, with a loose projector and 

measuring boards being hung in the chassis.

A

A

C

B

S7 00 712

S7 00 089

FRONT AXLE/LEADING REAR AXLE

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ΧΦ65/75/85 series

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9.

Place wheel A (LHD-type vehicle) or wheel C 

(RHD-type vehicle) in the "straight ahead" 

position using the alignment equipment.

10. Check whether the steering gear is in the 

central position using the markings on the 

steering box.

If the central position deviates, the steering 

rod from the steering box to the front axle 

should be adjusted before the rear steerable 

axle is measured.

11. Check whether the front axle wheel is still in 

the "straight ahead" position.

Measure the position of wheel B (LHD-type 

vehicle) or the position of wheel D (RHD-type 

vehicle)..

Correct the alignment if the position in 

relation to the front axle wheel is outside the 

tolerance (see 'Technical data').

Note:

If a large deviation is measured, the cause 

should be traced. The deviation could, for 

example, have been caused by a collision, 

during which components were bent. If so, 

the remaining steering gear components 

should be inspected carefully.

S7 00 024

S7 00 090