1998 JAGUAR X308 Workshop Manual

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Page 481 of 2490

JAGUAR X308 1998 2.G Workshop Manual
P
arts List
It

em
Par
t Number
De
scription
1—Steeri

ng rack
2—Hydrau

lic control valve
3—Torsio

n bar
4—Pin

ion
5—O

perating cylinder and piston
6—Inne

r ball joint
7�

Page 482 of 2490

JAGUAR X308 1998 2.G Workshop Manual
P a
rts List
The variable ratio rack:
Incorporates teeth
of varying pitch and angle of contact, giving a variable pi
tch circle diameter which is a minimum
at the center of the rack and a

Page 483 of 2490

JAGUAR X308 1998 2.G Workshop Manual
P
arts List
The positive center-feel torsion bar improves the straight ahead feel of the steering in the region where very small amounts
of hydraulic pressure, and hence re action pressure, are

Page 484 of 2490

JAGUAR X308 1998 2.G Workshop Manual
P a
rts List
The power assisted steering pump:
Is mo u
nted on a bracket installe
d on the front of the engine.
Provides hydraul
ic pressure fo
r the power steering system.
Is of t

Page 485 of 2490

JAGUAR X308 1998 2.G Workshop Manual The fluid reservo
ir:
Is lo

cated in the engine compartment, mounted on the engine compartment fuse box bracket.
Incorporates

a 10 micron, li
fetime, integral filter.
Has a cap
acity

Page 486 of 2490

JAGUAR X308 1998 2.G Workshop Manual
P a
rts List
The supply and return pipes are secured to the hydraulic control valve housing by a latch-plate having a single fixing screw.
The latch-plate is captive to the supply pipe. Each pi

Page 487 of 2490

JAGUAR X308 1998 2.G Workshop Manual m
ember. The quick-fit connector O-rings are not serviceable.
Special tool JD 182 is required to disconnect the quick-fit connector.
Hydraulic System

P
arts List
Hydraulic System

Op
erating

Page 488 of 2490

JAGUAR X308 1998 2.G Workshop Manual The rotary distri
butor and control sleeve turn relative to ea
ch other, forming the unequal restrictions which create the
differential pressures to operat e the rack piston; the displacement of the

The rotary distri
butor and control sleeve turn relative to ea
ch other, forming the unequal restrictions which create the
differential pressures to operat e the rack piston; the displacement of the di stributor and sleeve being controlled by the
elastic deformation of a torsion bar which is concentric with the pinion and valve. Refer to Positive Center-Feel Torsion Bar
in this sub-sectio n.
The hydraulic reaction piston moves axially, relative to th e rotary distributor, and is connected to the control sleeve by a
three-bearing helical screw. Pressure applied either side of the hydraulic reaction piston is translated into a rotational force
which increases steering effort. For detail s of Servotronic speed-sensitive steering control, refer to Servotronic Control in
this sub-section.
When the vehicle is travelling straight ah ead, the valve restrictions are balanced, thus providing equal pressures on either
side of the rack piston. When load is a pplied at the steering wheel, the two halves of the control valve (rotary distributor
and control sleeve) are displaced making the restrictions unequa l. The resulting differential pressures on either side of the
rack piston, assist the steering rack to mo ve to left or right. As the turning load is removed, the pressures equalize again
and the steering return s to the straight ahead position , aided by suspension geometry.
Serv
otronic Control

P a
rts List
The Servotronic system provides steering assistance which is pr oportional to vehicle speed. It comprises the steering control
module, and Servotronic valve forming part of the hydraulic control valve assembly.
The Servotronic valve is an electro-hydrauli c device with a variable orifice, which varies in size according to the position of a
needle valve. The needle valve is controlled by a solenoid in response to a variable current input from the steering control
Ite
m
Part
Number
Descr
iption
1—Vehi
cl
e speed input
2—Steeri
ng control
module
3—Servotronic valve
4—Hydraulic

control valve housing
5—PAS stee
rin
g pump
6—Batt
ery

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