Description

DESCRIPTION

The steering box assembly comprises a rack and pinion steering box assisted by the hydraulic oil under pressure supplied by a special pump operated by the engine.

In the steering box there is an operating cylinder (2) in which a double-acting piston (1) runs which is integral with the rack and pinion rod.

In the seat of the worm screw there is a distributor valve (3) with the corresponding ducts which is controlled by a torsion device (4) on the end of the worm screw.

Depending on the torsion transmitted to the device by the steering wheel, the pump oil is sent to the tank or to one of the two chambers A or B of the operating cylinder. The thrust generated by the pressure of the oil on the side surface of the piston causes it to move, thus also the rack and pinion.

1. Double-acting piston
2. Operating cylinder
3. Distributor valve
4. Torsion device
5. Operating cylinder right chamber
6. Operating cylinder left chamber

Two guards made of sound deadening material are fitted at the ends of the power steering box as illustrated.

REMOVING/REFITTING

• Using a suitable syringe, empty the power steering system tank.
• Remove the front wheels.

1. Working from inside the car, slacken the bolt fastening the steering column to the power steering box pinion.

15 ÷ 19 Nm
1.5 ÷ 1.9 Kgm

20 ÷ 24 Nm
2.0 ÷ 2.5 Kgm

1. Slacken the nuts fastening the track ball joints to the wheel hubs.
2. Using tool no. 1.821.169.000 disconnect the track rod joints from the hubs.

29 ÷ 36 Nm
3.0 ÷ 3.7 Kgm