V90 L6-2.9L VIN 96 B6304S (1998)
Steering Gear: Description and Operation
Gear
DESIGN
The steering gear is of the rack and pinion type with the mechanical and servo assisted elements combined in one module. This means that even if the
servo assistance was lost the mechanical steering would remain.
The mechanical element consists of the gear drive (18), steering rack (11) and tie rods (16).
The gear drive is carried by a journey bearing (7) and a roller bearing bearing in the steering gear housing. The input shaft is carried in a roller bearing
(4).
The steering rack is carried by a journey bearing on the right end and in the housing is guided by the gear drive (18) and the sprung pre-tensioning piston
(8).
A cylinder pipe (12) is secured to the steering gear housing (9). This pipe operates as the working cylinder for the piston fastened to the steering rack.
Hydraulic fluid from the power steering pump is regulated in the valve housing which is integrated into the steering gear housing.
The steering gear input shaft is connected to the gear drive with a torsion bar.
The steering gear is connected to the tie rods which have ball joints at the ends. The inner ball joints are inside rubber boots and fastened directly onto
the steering rack. The outer ball joints are permanently greased and threaded onto the tie rods.
The mechanical element of the steering gear is lubricated with a semi-fluid grease and separated from the servo element with seals (6 and 10).
In a steering operation when one rubber boot is compressed and the other stretched air can pass from one boot to the other via the hollow steering rack
and the non pressurized part of the steering gear housing.