L322 Range Rover System Description and Operation
STEERING
57-24
DESCRIPTION AND OPERATION
Steering in Right Turn Position
Circuit shows steering rotary valve in right turn position, at high vehicle speed and with rapid steering corrections. The
Servotronic transducer valve is fully open and the maximum hydraulic reaction is limited by the cut-off valve.
1 Return fluid control groove
2 Radial groove
3 Feed fluid control groove
4 Radial groove
5 Axial groove
6 Feed fluid control edge
7 Feed fluid radial groove
8 Return fluid control edge
9 Return fluid chamber
10 Cut-off valve
11 Radial groove
12 Servotronic transducer
13 Feed fluid radial groove
14 Radial groove
15 Orifice
16 Balls
17 Compression spring
18 PAS fluid reservoir
19 Torsion bar
20 Valve rotor
21 Reaction piston
22 Reaction chamber
23 Centering piece
24 Pressure relief/flow limiting valve
25 PAS pump
26 Inner track rod
27 Pinion
28 Valve sleeve
29 Steering rack
30 Rack housing
31 Power assist cylinder – right
32 Piston
33 Power assist cylinder – left
When the steering wheel is turned to the right, the steering rack and piston moves to the left in the piston bore. The
valve rotor is rotated to the right (clockwise) and pressurised fluid is directed over the further opened feed fluid control
edges and to the associated axial grooves, the radial groove and via an external pipe to the left power assist cylinder
chamber. The pressure applied to the piston from the left power assist cylinder chamber provides the hydraulic
assistance.
An adaptable pressure build-up is achieved by the partially or fully closed feed fluid control edges restricting or
preventing a connection between the fluid pressure inlet and the other axial grooves connected to the radial groove.
M57 1185
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