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

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Inspection and adjustment

FRONT AXLE/LEADING REAR AXLE

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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

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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