Mitsubishi Lancer Evolution IX. Manual - part 319

37-1

GROUP 37

POWER STEERING

CONTENTS

GENERAL INFORMATION . . . . . . . .

37-2

SERVICE SPECIFICATIONS. . . . . . .

37-4

LUBRICANTS  . . . . . . . . . . . . . . . . . .

37-4

SEALANTS  . . . . . . . . . . . . . . . . . . . .

37-5

SPECIAL TOOLS. . . . . . . . . . . . . . . .

37-5

ON-VEHICLE SERVICE. . . . . . . . . . .

37-7

STEERING WHEEL FREE PLAY CHECK . 

37-7

STEERING ANGLE CHECK . . . . . . . . . . . . 

37-8

TIE ROD END BALL JOINT TURNING 

 

TORQUE CHECK . . . . . . . . . . . . . . . . . . . . 

37-8

STATIONARY STEERING EFFORT CHECK

37-9

STEERING WHEEL RETURN TO CENTRE 

 

CHECK . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

37-9

DRIVE BELT TENSION CHECK. . . . . . . . . 

37-9

FLUID LEVEL CHECK  . . . . . . . . . . . . . . . . 

37-9

FLUID REPLACEMENT . . . . . . . . . . . . . . . 

37-10

POWER STEERING SYSTEM AIR 

 

BLEEDING  . . . . . . . . . . . . . . . . . . . . . . . . . 

37-10

OIL PUMP PRESSURE TEST  . . . . . . . . . . 

37-11

POWER STEERING PRESSURE SWITCH 

 

CHECK . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

37-11

TIE ROD END BALL JOINT DUST COVER 

 

CHECK . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

37-12

STEERING COLUMN SHAFT ASSEMBLY 

 

SHOCK ABSORBING MECHANISM CHECK

37-12

STEERING WHEEL*. . . . . . . . . . . . . .

37-13

REMOVAL AND INSTALLATION  . . . . . . . . 

37-13

STEERING COLUMN SHAFT 

 

ASSEMBLY* . . . . . . . . . . . . . . . . . . . .

37-15

REMOVAL AND INSTALLATION  . . . . . . . . 

37-15

DISASSEMBLY AND REASSEMBLY . . . . . 

37-17

POWER STEERING GEAR BOX AND 
LINKAGE* . . . . . . . . . . . . . . . . . . . . . .

37-18

REMOVAL AND INSTALLATION  . . . . . . . . 

37-18

INSPECTION. . . . . . . . . . . . . . . . . . . . . . . . 

37-21

DISASSEMBLY AND REASSEMBLY . . . . . 

37-22

TIE ROD END BALL JOINT DUST COVER 
REPLACEMENT . . . . . . . . . . . . . . . . . . . . . 

37-30

POWER STEERING OIL PUMP 

 

ASSEMBLY. . . . . . . . . . . . . . . . . . . . .

37-31

REMOVAL AND INSTALLATION  . . . . . . . . 

37-31

DISASSEMBLY AND REASSEMBLY . . . . . 

37-32

INSPECTION. . . . . . . . . . . . . . . . . . . . . . . . 

37-32

POWER STEERING HOSES*. . . . . . .

37-33

REMOVAL AND INSTALLATION  . . . . . . . . 

37-33

WARNINGS REGARDING SERVICING OF SUPPLEMENTAL RESTRAINT SYSTEM (SRS) EQUIPPED VEHICLES

WARNING

•

Improper service or maintenance of any component of the SRS, or any SRS-related component, can lead to 

personal injury or death to service personnel (from inadvertent firing of the air bag) or to the driver and 

passenger (from rendering the SRS inoperative).

•

Service or maintenance of any SRS component or SRS-related component must be performed only at an 

authorized MITSUBISHI dealer.

•

MITSUBISHI dealer personnel must thoroughly review this manual, and especially its GROUP 52B - Supplemental 

Restraint System (SRS) before beginning any service or maintenance of any component of the SRS or any 

SRS-related component.

NOTE

The SRS includes the following components: SRS-ECU, SRS warning lamp, air bag module, clock spring, and interconnecting                

wiring. Other SRS-related components (that may have to be removed/installed in connection with SRS service or maintenance)                

are indicated in the table of contents by an asterisk (*).

GENERAL INFORMATION

POWER STEERING

37-2

GENERAL INFORMATION

M1372000100434

Power steering has been adopted in all vehicles to 
make the steering system easier to handle.

FEATURES

• The system has been equipped with the MOMO 

leather 3-spoke-type steering wheel with built-in 
SRS air bag.

• A steering column with a shock absorbing mech-

anism and a tilt steering mechanism has been 
adopted.

• Integral-type rack and pinion gear with high rigid-

ity and excellent response has been adopted. 

• A variable capacity pump has been adopted to 

reduce power losses and improve fuel economy.

• Improved the cooling efficiency of power steering 

fluid by adopting a cooler tube to the fluid line. 

SPECIFICATIONS

Item

Specification

Steering wheel

Type

MOMO leather-wrapped 3-spoke type

Outside diameter mm

365

Maximum number of turns

2.1 

Steering column

Column mechanism

Tilt steering 

Power steering type

Integral type

Oil pump

Type

Variable capacity type (vane pump)

Basic delivery rate cm

3

/rev.

9.6 

Relief pressure MPa

8.3 

− 9.0

Reservoir type

Separate type

Pressure switch

Equipped

Steering gear

Type

Rack and pinion

Stroke ratio (Rack stroke/Steering 
wheel maximum turning radius)

68.61

Rack stroke mm

146

GENERAL INFORMATION

POWER STEERING

37-3

CONSTRUCTION DIAGRAM
LH drive vehicles

AC310660AB

Steering wheel

Steering column and shaft 

Cooler tube

Suction hose

Pressure hose 

Oil pump assembly

Steering gear and linkage

Return hose

Reservoir tank

RH drive vehicles

AC310702 AC

Steering wheel

Steering column and shaft 

Cooler tube

Suction hose

Pressure hose 

Oil pump assembly

Steering gear and linkage

Return hose

Reservoir tank

SERVICE SPECIFICATIONS

POWER STEERING

37-4

SERVICE SPECIFICATIONS

M1372000300502

Item

Standard value

Limit

Steering wheel free 
play mm

With engine running

−

30

With engine stopped

10 or less

−

Steering angle

Inner wheel

31

°45' ± 1°30'

−

Outer wheel (reference)

27

°15'

−

Toe-in

0 

± 2

−

Tie rod end ball joint turning torque N

⋅m

1.0 

− 3.0

−

Stationary steering effort N [Fluctuation allowance N]

32 or less [6.0 or less]

−

Oil pump pressure 
MPa (750 

± 100 r/min).

Oil pump relief pressure

8.3 

− 9.0

−

Pressure under no-load conditions

0.2 

− 0.8

−

Steering gear retention hydraulic pressure

8.3 

− 9.0

−

Oil pressure switch operating pressure 
MPa

OFF 

→ ON

1.8 

− 2.4

−

ON 

→ OFF

1.0 

− 2.4

−

Total pinion torque N

⋅m

Total rotation torque

0.8 

− 1.8

−

Torque variation

0.49 or less

−

Tie rod swing resistance N [Tie rod swing torque N

⋅m]

8 

− 27 [1.5 − 4.9]

−

Opening dimension of special tool boot band crimping tool (MB991561) 
mm

2.9

−

Band crimped width mm

2.4 

− 2.8

−

LUBRICANTS

M1372000400435

Item

Specified lubricant

Quantity

Power steering fluid

ATF DEXRON III or DEXRON II Approximately 1.0 L

Steering gear

Bearing

ATF DEXRON III or DEXRON II As required

O-ring and seal ring
Oil seal
Special tool (MB991214)
Bellows

Silicon grease

As required

Tie rod end ball joint

Multipurpose grease SAE J310, 
NLGI No.2 or equivalent

As required

Pinion and valve assembly

Repair kit grease

As required

Rock assembly

Oil pump

O-ring

ATF DEXRON III or DEXRON II As required