Astra HD8Ec Manuale - Pagina 15

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ASTRA HD8Ec

Finding chassis twist

Figure 27

Slight torsion may only be detected with the cab and mech-

anical units removed. To make the check, proceed as follows:

- place the chassis on two stands;

- fasten one side of the chassis to the stand with two

clamps;

- set the other side of the chassis on the knee of an "L" iron

(1, Figure 27) in central position under the rear cross

member;

- place a ruler in cross position and a spirit level (2,

Figure 27) on the ruler and check the readings.

The same value should result at each check point, otherwise

the chassis is deformed.

PRECAUTIONS

Figure 28

When welding, drilling, grinding or cutting near the pipes of

the braking system, especially near plastic parts or electrical

wiring, take adequate precautions to protect them, and if

necessary, remove them. All parts of the chassis that are re-

conditioned are to be protected from oxidation and cor-

rosion.

SECTION 18

Protection and painting operations are to be carried out accu-

rately on all the parts involved, following any instructions,

methods, and preventive precautions indicated by the paint

manufacturers.

Figure 29

17357

The chassis reconditioning is obtained by wedge heating the

part concerned with a torch.

During this operation the metal must become cherry red

coinciding with a temperature ranging between 600 and

680°C.

The points already heated must not be re-heated.

Let the heated points cool slowly without using water, com-

pressed air or other cooling agents.

Figure 30

Straighten chassis lateral bending by wedge heating the upper

and lower edge of the chassis length concerned.

The wedge point must in the desired bending direction.

If the base (a, Figure 30) of the two wedges is on the upper

edge plate of the side member, the plate must also be heated,

but last.

17358

CAB AND CHASSIS

17359

17360