Infiniti G37 Coupe. Manual - part 1232

ST-28

< ON-VEHICLE REPAIR >

STEERING GEAR AND LINKAGE

Spiral cable may be cut if steering wheel turns while separating steering column assembly and steer-
ing gear assembly. Be sure to secure steering wheel using string to avoid turning.
• Tighten the mounting bolts in the order shown in the figure when

installing the steering gear assembly.

• When installing suction hoses (1), refer to the figure.

CAUTION:

• Never apply fluid to the hose (1) and tube (2).
• Insert hose securely until it contacts spool (A) of tube.
• Install clamp (3) to the hose at 3 – 8 mm (0.12 – 0.31 in) (L)

from the edge of the hose.

• When installing lower joint to steering gear assembly, follow the procedure listed below.
- Set rack of steering gear in the neutral position.

NOTE:
To get the neutral position of rack, turn gear-sub assembly and measure the distance of inner socket, and
then measure the intermediate position of the distance.

- Align rear cover cap projection (A) with the marking position of

gear housing assembly (B).

- Install slit part of lower joint (C) aligning with the rear cover cap

projection (A). Make sure that the slit part of lower joint (C) is
aligned with rear cover cap projection (A) and the marking position
of gear housing assembly (B).

• After installation, bleed air from the steering hydraulic system.

Refer to 

ST-10, "Inspection"

.

• Perform final tightening of nuts and bolts on each part under

unladen conditions with tires on level ground when removing steer-
ing gear assembly. Check wheel alignment. Refer to 

FSU-7,

"Wheel Alignment Inspection"

.

• Adjust neutral position of steering angle sensor after checking wheel alignment. Refer to 

BRC-8, "ADJUST-

MENT OF STEERING ANGLE SENSOR NEUTRAL POSITION : Special Repair Requirement"

.

• Perform 4WAS front actuator neutral position adjustment. Refer to 

STC-27, "4WAS FRONT ACTUATOR

NEUTRAL POSITION ADJUSTMENT : Description"

. (4WAS models)

Disassembly and Assembly

INFOID:0000000001666238

DISASSEMBLY

1.

Remove low pressure piping.

CAUTION:

• Disassemble and assemble steering gear assembly by fixing the mounting area with a vise using

copper plates.

• Clean steering gear assembly with kerosene before disassembling. Be careful to avoid splash-

ing or applying any kerosene over connector of discharge port or return port.

2.

Remove cylinder tubes from gear housing assembly.

3.

Remove rear cover cap from gear-sub assembly.

Temporary tightening: 1 

⇒

 2 

⇒

 3 

⇒

 4

Final tightening: 1 

⇒

 2 

⇒

 3 

⇒

 4

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STEERING GEAR AND LINKAGE

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4.

Measure adjusting screw height “H”, and loosen adjusting
screw.

CAUTION:

• Never loosen adjusting screw 2 turns or more.
• Replace steering gear assembly if adjusting screw is

loosened 2 turns or more and it is removed.

5.

Remove gear-sub assembly from gear housing assembly.

6.

Remove O-ring from gear housing assembly.

7.

Loosen outer socket lock nut, and remove outer socket.

8.

Remove boot clamps, and then remove boot from inner socket.

CAUTION:

Never damage inner socket and gear housing assembly when removing boot. Inner socket and
gear housing assembly must be replaced if inner socket and gear housing assembly are damaged
because it may cause foreign material interfusion.

9.

Release lock with lock plate.

CAUTION:

Never damage rack surface.

10. Remove inner socket from gear housing assembly.

ASSEMBLY

1.

Apply recommended fluid to O-ring, and then install O-ring to gear housing assembly.

2.

Install gear-sub assembly to gear housing assembly.

CAUTION:

In order to protect oil seal from any damage, insert sub-gear assembly out straightly.

3.

Install inner socket to gear housing assembly with the following procedure.

a.

Attach lock plate to rack part of gear housing assembly.

CAUTION:

Never reuse the lock plate.

b.

Apply thread sealant into the thread of inner socket.
• Use Genuine Silicone RTV or equivalent. Refer to 

GI-15, "Recommended Chemical Products and

Sealants"

.

c.

Screw inner socket into rack part and tighten at the specified torque.

d.

Secure with lock plate.

4.

Decide on the neutral position for the rack.

5.

Install rear cover cap to gear sub-assembly.

CAUTION:

Make sure that the projection of rear cover cap is aligned
with the marking position of gear housing assembly.

6.

Apply recommended thread locking sealant to the thread (2
turns thread), and then screw in the adjusting screw until it
reaches height “H” from gear housing assembly measured
before disassembling.

7.

Move rack assembly 10 strokes throughout the full stroke so that
the parts can fit with each other.

SGIA0624E

Standard

Rack stroke “L”

: Refer to 

ST-48, "Rack 

Stroke"

.

SGIA0877E

SGIA0624E

ST-30

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STEERING GEAR AND LINKAGE

8.

Adjust pinion rotating torque with the following procedure.

a.

Measure pinion rotating torque within 

±

180

°

 of neutral position

of the rack assembly using Tools. Stop the gear at the point
where highest torque is read.

b.

Loosen adjusting screw and retighten to 5.4 N·m (0.55 kg-m, 48
in-lb), and then loosen by 20 to 40

°

.

c.

Measure pinion rotating torque using Tools to make sure that the
measured value is within the standard. Readjust if the value is
outside the standard. Replace steering gear assembly if the
value is outside the standard after readjusting or adjusting screw
rotating torque is 5 N·m (0.51 kg-m, 44 in-lb) or less.

d.

Apply recommended liquid gasket to inner socket and turn pinion fully to left with inner socket installed to
gear housing assembly.

e.

Install dial gauge at 5 mm (0.20 in) (L) from the edge of gear
housing assembly (1), and tooth point.

f.

Measure vertical movement of rack assembly when pinion is
turned clockwise with torque of 19.6 N·m (2.0 kg-m, 14 ft-lb).
Readjust adjusting screw angle if the measured value is outside
the standard.

• If reading is outside of the specification, readjust screw angle

with adjusting screw.

CAUTION:

• If reading is still outside of specification, or if the rotating torque of adjusting screw is less

than 5 N·m (0.51 kg-m, 44 in-lb), replace steering gear assembly.

• Never turn adjusting screw more than twice.
• Replace steering gear assembly when adjusting screw is removed or turned more than twice.

9.

Install large end of boot to gear housing assembly.

10. Install small end of boot to inner socket boot mounting groove.
11. Install boot clamp to boot small end.

12. Install boot clamp to the large side of boot with the following procedure.

CAUTION:

Never reuse boot clamp.

A: Preload gauge [SST: ST3127S000 (J-25765-A)]

B: Preload adapter [SST: KV48103400 (

—

)]

SGIA1383E

Pinion rotating torque

Around neutral position 
(within

±

100

°

) average “A”

: 1.95 – 2.58 N·m (0.20 – 
0.26 kg-m, 18 – 22 in-lb)

Maximum variation “B”

: 0.98 N·m (0.10 kg-m, 9.0 
in-lb)

Vertical movement

: 0.265 mm (0.0104 in)

SGIA0936E

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SGIA1325E

STEERING GEAR AND LINKAGE

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a.

Tighten large side of boot with boot clamp (stainless wire).

b.

Wrap clamp around boot groove for two turns. Insert a flat-
bladed screwdriver in loops on both ends of wire. Twist 4 to 4.5
turns while pulling them with force of approximately 98 N (10 kg,
22 lb).

c.

Twist boot clamp as shown. Pay attention to relationship
between winding and twisting directions.

d.

Twisted area (A) of clamp is in the opposite side of adjusting
screw (1) as shown in the figure (to prevent contact with other
parts). 

e.

Bent cut end of the wire as shown in the figure after twisting the
wire 4 to 4.5 turns so that cut end does not contact with boot.

CAUTION:

Keep gap from cylinder tube 5 mm (0.20 in) or more.

13. Install cylinder tubes to gear housing assembly.

14. Install low pressure piping.

Wire length “L”

: 370 mm (14.57 in)

SGIA0163E

SGIA0164E

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Wire angle “A”

: 45

°

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