Daewoo Nubira. Manual - part 224

6C – 32

I

POWER STEERING GEAR

DAEWOO V–121 BL4

Notice : If the stub shaft is not held, damage to the pinion
teeth will occur.

3.  While holding the stub shaft, remove the locknut

from the pinion.

4.  With the gear centered, mark the location of the

stub shaft notch on the housing to aid in properly
installing the pinion and valve assembly.

5.  Remove the upper housing retaining ring and, using

an arbor press, press on the threaded end of the
pinion until it is possible to remove the valve and
pinion assembly from the housing.

POWER STEERING GEAR  6C – 33

DAEWOO V–121 BL4

6.  Remove the stub shaft dust seal, the stub shaft

bearing annulus assembly, and the valve and pinion
assembly from the housing.

7.  Inspect the valve body rings for wear or damage.

Replace the valve body rings, as needed. Coat the
rings with power steering fluid before installation.

8.  Remove the lower pinion valve seal and bushing.

Discard the seal.

Assembly Procedure

Notice : Coat all of the seals and bushings with power
steering fluid to ensure proper sealing and prevent vehicle
damage.

1.  Install the bushing and a new lower pinion valve

seal.

6C – 34

I

POWER STEERING GEAR

DAEWOO V–121 BL4

Important : When the valve and pinion assembly is fully
seated in the housing, be sure the notch in the stub shaft
and the mark on the housing line up. If this is not done, the
vehicle will not pass the straight–ahead check and will
have poor steering performance.

2.  Install the valve and pinion assembly, the stub shaft

bearing annulus assembly, and the stub shaft dust
seal.

Notice : If the stub shaft is not held, damage to the pinion
teeth will occur.

3.  While holding the stub shaft, tighten the locknut

onto the pinion shaft.

Tighten

Tighten the pinion locknut to 30 N

S

m (22 lb–ft).

4.  Replace the dust cover onto the housing.
5.  Install the rack and pinion steering assembly. Refer

to”Rack and Pinion Assembly”in this section.

6.  Perform the straight–ahead check. Refer

to”Straight–Ahead Check”in this section.

POWER STEERING GEAR  6C – 35

DAEWOO V–121 BL4

GENERAL DESCRIPTION

AND SYSTEM OPERATION

POWER RACK AND PINION

The power rack and pinion steering system has a rotary
control valve that directs hydraulic fluid coming from the
hydraulic pump to one side or the other side of the rack pis-
ton. The integral rack piston is attached to the rack. The
rack piston converts hydraulic pressure to a linear force

that moves the rack left or right. That force is then trans-
mitted through the tie rods to the steering knuckles, which
turn the wheels.

If power rack and pinion steering is not available, manual
rack and pinion control is used; however, with this system,
more steering effort is required. The movement of the
steering wheel is transferred to the pinion. The rotary
movement of the pinion is then transferred through the pin-
ion threads, which mesh with teeth on the rack, thereby
causing the rack to move in a linear direction.

A vane–type of hydraulic pump provides hydraulic pres-
sure for both steering systems.