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.
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