Power steering box

POWER STEERING BOX

DESCRIPTION

The power steering box assembly is similar to a conventional rack and pinion steering system with the exception of the following:

• - an operating cylinder (2) has been made in the steering box in which a double-acting piston (1) runs that is integral with the rack rod;

• a distributing valve (3) with the corresponding ducts is located in the housing of the worm screw. This is controlled by a torsion device (4) in the end of the worm screw.

Depending on the torsion transmitted by the steering wheel to the device, the oil from the pump is sent to the reservoir, or to one of the two chambers A or B of the operating cylinder. The force generated by the pressure of the oil on the side surface of the piston determines its movement, thus also of the rack.

1. Double-acting piston
2. Operating cylinder
3. Distributing valve
4. Torsion device
5. A. Right chamber operating cylinder
6. B. Left chamber operating cylinder

REMOVAL/REFITTING

• Set the car on a lift.
• Using a suitable syringe, empty the power steering system reservoir.
• 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
1.6 ÷ 1.9 kgm

• Raise the car.

1. Slacken the nuts fastening the track rod ball joints to the wheel hubs.
2. Using tool N° 1.821.169.000 (A.3.0633), disconnect the ball joints from the hubs.

1.821.169.000
(A.3.0633)

30 ÷ 37 Nm
3.0 ÷ 3.8 kgm