Daewoo Matiz (2003 year). Manual - part 174

SECTION 6C

POWER STEERING GEAR

CAUTION: Disconnect the negative battery cable before removing or installing any electrical unit or when a
tool or equipment could easily come in contact with exposed electrical terminals. Disconnecting this cable
will help prevent personal injury and damage to the vehicle. The ignition must also be in B unless otherwise
noted.

TABLE OF CONTENTS

Description and Operation

6C-2

. . . . . . . . . . . . . . . . . . 

Power Rack and Pinion

6C-2

. . . . . . . . . . . . . . . . . . . . 

Diagnostic Information and Procedures

6C-3

. . . . . 

Power Rack and Pinion Steering Gear

6C-3

. . . . . . . 

   Adjust the Free Load of the Steering Gear

 6C-5

. . . 

Repair Instructions

6C-6

. . . . . . . . . . . . . . . . . . . . . . . . . 

On-Vehicle Service

6C-6

. . . . . . . . . . . . . . . . . . . . . . . . . . 

Rack and Pinion Assembly

6C-6

. . . . . . . . . . . . . . . . . 

Power Steering Gear Rack and Pinion Boot

6C-7

. . . 

Unit Repair

6C-8

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

Tie Rod End Boot

6C-8

. . . . . . . . . . . . . . . . . . . . . . . . . 

Hydraulic Cylinder Lines

6C-8

. . . . . . . . . . . . . . . . . . . . 

Rack and Pinion Steering Gear

6C-9

. . . . . . . . . . . . . . 

Assembly

Specifications

6C-13

. . . . . . . . . . . . . . . . . . . . . . . . . . . . 

General Specifications

6C-13

. . . . . . . . . . . . . . . . . . . . 

Fastener Tightening Specifications

6C-13

. . . . . . . . . . 

6C – 2  POWER STEERING GEAR

DESCRIPTION AND OPERATION

POWER RACK AND PINION

The power rack and pinion steering system has a rotary
control valve which directs the hydraulic fluid coming
from the hydraulic pump to one side or the other side of
the rack piston. The integral rack piston is attached to
the rack. The rack piston converts hydraulic pressure to
a linear force which moves the rack left or right. The
force is then transmitted through the tie rods and the tie

rod ends to the steering knuckles, which turn the
wheels.

If hydraulic assist is not available, manual control is
maintained. However, under these conditions, more
steering effort is required. The movement of the steering
wheel is transferred to the pinion. The movement of the
pinion is then transferred through the pinion teeth, which
meshs with the teeth on the rack, causing the rack to
move.

POWER STEERING GEAR  6C – 3

DIAGNOSTIC INFORMATION AND PROCEDURES

POWER RACK AND PINION STERING GEAR

Condition

Probable Cause

Correction

Hissing Noise

D

Loose steering coupling joints.

D

Tighten the steering coupling
joints.

D

Improperly contacted the power
steering hose with other
components.

D

Fit the power steerng hose into
the hose clips correctly.

Rattling Noise in Steering Gear

D

Improperly contacted the power
steering line with the body.

D

Fix the steering line correctly.

D

Insufficient lubricant.

D

Lubricate the steering gear.

D

Loose steering gear mounting.

D

Tighten the steering gear
mounting bracket bolts.

D

Improperly installed tie rod ends.

D

Tighten the tie rod joints and
replace the tie rod end as needed.

Poor Return of Steering Wheel
to Center

D

Improperly contacted the steering
wheel with the turn signal housing.

D

Adjust the turn signal housing.

D

Improper binding or looseness of
steering coupling.

D

Replace the intermediate shaft.

D

Stuck and improperly aligned
power steering pump flow control
valve.

D

Replace the power steering pump.

D

Improper binding or looseness of
tie rods and ball joints.

D

Tighten the tie rods and the ball
joints. Replace the tie rods and
the ball joints as needed.

D

Poor adjustments of the steering
gear.

D

Perform a straight-ahead check.

Momentary Increase in Effect
When Turning the Wheel

D

Internal leaks of the power
steering pump.

D

Replace the power steering pump.

Quickly

D

The damage or restricted flow of
the hoses.

D

Replace the power steering hoses
and pipes.

D

Insufficient power steering fluid.

D

Fill the power steering fluid
reservoir.

D

Stuck and improperly operated
power steering pump flow control
valve.

D

Replace the power steering pump.

Steering Surges or Jerks When
Turning with Engine Running

D

Insufficient pressure of the power
steering pump.

D

Replace the power steering pump.

D

Stuck and improperly operated
power steering pump flow control
valve.

D

Replace the power steering pump.

D

The slippage of the pump drive
belt.

D

Tighten the pump drive belt.

D

Contaminated air in the power
steering system.

D

Bleed the power steering system.

6C – 4  POWER STEERING GEAR

POWER RACK AND PINION STERING GEAR (Cont’d)

Condition

Probable Cause

Correction

Excessive Wheel Kickback or
Loose Steering

D

Contaminated air in the power
steering system.

D

Bleed the power steering system.

D

Worn or damaged wheel bearings.

D

Replace the wheel bearings.

D

Loose steering gear mounting.

D

Tighten the steering gear
mounting bracket bolts.

D

Improperly installed steering
gear-to-intermediate shaft joints.

D

Tighten the joint bolt.

D

Loose tie rods and ball joints.

D

Tighten the tie rods and the ball
joints.

D

Replace the tie rods and the ball
joints as needed.

Hard Steering or Lack of Assist
(Especially During Parking)

D

Stuck and improperly installed
power steering pump flow control
valve.

D

Replace the power steering pump.

D

Insufficient pressure of the power
steering pump.

D

Replace the power steering pump.

D

Internal leaks of power steering
pump.

D

Replace the power steering pump.

D

Improper tension of the pump
drive belt.

D

Adjust the pump drive belt
tension.