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Index of /manuals/AUTOMOBILE/NISSAN/QX56/2005 QX56

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G STEERING

PS A

SECTION

POWER STEERING SYSTEM C

CONTENTS

PRECAUTIONS ......................................................... 2 Precautions for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT PRE-TENSIONER" ................................................................. 2 Precautions for Steering System ............................. 2
PREPARATION .......................................................... 3 Special Service Tools (SST) .................................... 3 Commercial Service Tools ....................................... 4
NOISE, VIBRATION, AND HARSHNESS (NVH) TROUBLESHOOTING ............................................... 5
NVH Troubleshooting Chart .................................... 5 POWER STEERING FLUID ....................................... 6
Checking Fluid Level ............................................... 6 Checking Fluid Leakage .......................................... 6 Air Bleeding Hydraulic System ................................ 6 STEERING WHEEL ................................................... 7 On-Vehicle Inspection and Service ......................... 7
CHECKING CONDITION OF INSTALLATION ..... 7 CHECKING STEERING WHEEL PLAY ............... 7 CHECKING NEUTRAL POSITION ON STEERING WHEEL ......................................................... 7 CHECKING STEERING WHEEL TURNING FORCE ................................................................. 7 CHECKING FRONT WHEEL TURNING ANGLE..... 8 Removal and Installation ......................................... 8 REMOVAL ............................................................ 8 INSTALLATION .................................................... 8 TILT SYSTEM ............................................................ 9 Removal and Installation ......................................... 9 TILT MOTOR AND TILT SENSOR ....................... 9 STEERING COLUMN .............................................. 10 Removal and Installation ....................................... 10 REMOVAL .......................................................... 10 INSPECTION AFTER REMOVAL .......................11 INSTALLATION ...................................................11

INSPECTION AFTER INSTALLATION ............... 12 F

Disassembly and Assembly ................................... 13

DISASSEMBLY .................................................. 13

ASSEMBLY ........................................................ 14 PS INSPECTION AFTER ASSEMBLY ..................... 14

POWER STEERING GEAR AND LINKAGE ........... 15

Removal and Installation ....................................... 15 REMOVAL .......................................................... 15

INSTALLATION .................................................. 16

INSPECTION AFTER INSTALLATION ............... 17 Disassembly and Assembly ................................... 17 I

DISASSEMBLY .................................................. 17

INSPECTION AFTER DISASSEMBLY ............... 20

ASSEMBLY ........................................................ 21 J

POWER STEERING OIL PUMP .............................. 26

On-Vehicle Inspection and Service ........................ 26

CHECKING RELIEF OIL PRESSURE ............... 26 K Removal and Installation ....................................... 26

REMOVAL .......................................................... 26

INSTALLATION .................................................. 26 Disassembly and Assembly ................................... 27 L

INSPECTION BEFORE DISASSEMBLY ............ 27

DISASSEMBLY .................................................. 27

INSPECTION AFTER DISASSEMBLY ............... 28 M

ASSEMBLY ........................................................ 28

HYDRAULIC LINE ................................................... 31

Removal and Installation ....................................... 31

SERVICE DATA AND SPECIFICATIONS (SDS) ..... 33

Steering Wheel ...................................................... 33

Steering Column .................................................... 33

Steering Outer Socket and Inner Socket ............... 34

Steering Gear ........................................................ 35

Oil Pump ................................................................ 35

Steering Fluid ......................................................... 35

Revision: October 2005

PS-1

2005 QX56

PRECAUTIONS

PFP:00001

Precautions for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT

BELT PRE-TENSIONER"

EGS000U4

The Supplemental Restraint System such as "AIR BAG" and "SEAT BELT PRE-TENSIONER", used along with a front seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain types of collision. This system includes seat belt switch inputs and dual stage front air bag modules. The SRS system uses the seat belt switches to determine the front air bag deployment, and may only deploy one front air bag, depending on the severity of a collision and whether the front occupants are belted or unbelted. Information necessary to service the system safely is included in the SRS and SB section of this Service Manual.
WARNING: G To avoid rendering the SRS inoperative, which could increase the risk of personal injury or death
in the event of a collision which would result in air bag inflation, all maintenance must be performed by an authorized NISSAN/INFINITI dealer.
G Improper maintenance, including incorrect removal and installation of the SRS, can lead to personal injury caused by unintentional activation of the system. For removal of Spiral Cable and Air Bag Module, see the SRS section.
G Do not use electrical test equipment on any circuit related to the SRS unless instructed to in this Service Manual. SRS wiring harnesses can be identified by yellow and/or orange harnesses or harness connectors.

Precautions for Steering System

EGS000U5

G Before disassembly, thoroughly clean the outside of the unit.
G Disassembly should be done in a clean work area. It is important to prevent the internal parts from becoming contaminated by dirt or other foreign matter.
G For easier and proper assembly, place disassembled parts in order on a parts rack.
G Use nylon cloth or paper towels to clean the parts; common shop rags can leave lint that might interfere with their operation.
G Before inspection or reassembly, carefully clean all parts with a general purpose, non-flammable solvent.
G Before assembly, apply a coat of recommended Genuine NISSAN PSF or equivalent to hydraulic parts. Petroleum jelly may be applied to O-rings and seals. Do not use any grease.
G Replace all gaskets, seals and O-rings. Avoid damaging O-rings, seals and gaskets during installation. Perform functional tests whenever designated.

Revision: October 2005

PS-2

2005 QX56

PREPARATION

PREPARATION Special Service Tools (SST)

PFP:00002
A
EGS000U6

The actual shapes of Kent-Moore tools may differ from those of special service tools illustrated here.

Tool number (Kent-Moore No.) Tool name

Description

ST3127 S000 (See J-25765-A) Preload gauge 1. GG9103000
(J25765-A) Torque wrench 2. HT62940000 ( -- ) Socket adapter 3. HT62900000 ( --) Socket adapter
HT72520000 (J-25730-A) Ball joint remover a: 33 mm (1.30 in) b: 50 mm (1.97 in) r: 11.5 mm (0.453 in)

S-NT541

Inspecting of pinion rotating torque and rota-

tional torque for ball joint

F
Removing steering outer socket
PS

H
NT546

-- (J-46213) Rear cover wrench a: 21.6 mm (0.850 in) b: 34.9 mm (1.374 in)

Removing rear cover
I

SGIA0516E

KV48104400 (-- ) Teflon ring correcting tool a: 50 mm (1.97 in) dia. b: 36 mm (1.42 in) dia. c: 100 mm (3.94 in)

Installing of rack Teflon ring
K
L

KV48103400 ( -- ) Torque adapter

S-NT550

Inspecting rotational torque

ZZA0824D

Revision: October 2005

PS-3

2005 QX56

Tool number (Kent-Moore No.) Tool name

1. KV48105300-4 and 5295262U10

(

)

Connector A and O-ring

2. KV48105300-3 and 5295262U00

(

)

Eye-bolt and O-ring

3. KV48103500

(J26357 and J26357-10)

Pressure gauge and shut-off valve

4. KV48105300-1 and 5295262U00

(

)

Connector B and O-ring

5. KV48105300-2

(

)

Nut

-- (J-44372) Spring gauge

PREPARATION
Description Measuring oil pump relief pressure
SGIA0427E
Measuring steering wheel turning force

KV481J0010 (J-1859A) Steering wheel puller

LST024

Removing steering wheel

KV481J0020 (J-42578) Steering wheel puller legs

LHIA0043E

Removing steering wheel

Commercial Service Tools
Tool name Power tool

LHIA0044E
Description Removing nuts and bolts

EGS000U7

PBIC0190E

Revision: October 2005

PS-4

2005 QX56

NOISE, VIBRATION, AND HARSHNESS (NVH) TROUBLESHOOTING

NOISE, VIBRATION, AND HARSHNESS (NVH) TROUBLESHOOTING NVH Troubleshooting Chart

Use chart below to help you find the cause of the symptom. If necessary, repair or replace these parts. B

C
Reference page
D

Possible cause and sus-

pected parts

Symptom ×: Applicable

Revision: October 2005

Noise Shake Vibration Shimmy Shudder

× × ××××× × ×

Fluid level

PS-6

Air in hydraulic system

PS-6

Outer socket ball joint swinging force

PS-20

Outer socket ball joint rotating torque

PS-20

Outer socket ball joint end play

PS-20

Steering fluid leakage

PS-6

Steering wheel play

PS-7

PS-5

Steering gear rack sliding force

PS-7

Drive belt looseness

EM-12, "Checking Drive Belts"

×××

×××××

×××

Improper steering wheel

PS-7

Improper installation or looseness of tilt lock lever

PS-13

Mounting rubber deterioration

PS-15

Steering column deformation or damage

PS-11

Improper installation or looseness of steering column

PS-10

Steering linkage looseness

PS-15

× × × × × ×× × K

PROPELLER SHAFT

PR-3, "NVH Troubleshooting Chart"

FRONT FINAL DRIVE

FFD-6, "NVH Troubleshooting Chart"

× × × ×× ×

×××

××××

WHEEL HUB

FAX-4, "NVH Troubleshooting Chart"

SUSPENSION

FSU-4, "NVH Troubleshooting Chart"

TIRES

WT-4, "NVH Troubleshooting Chart"

PFP:00003
A
EGS000U8

2005 QX56

ROAD WHEEL

WT-4, "NVH Troubleshooting Chart"

DRIVE SHAFT

FAX-4, "NVH Troubleshooting Chart"

BRAKES

BR-5, "NVH Troubleshooting Chart"

POWER STEERING FLUID

POWER STEERING FLUID
Checking Fluid Level
Check fluid level, referring to the scale on reservoir tank. Use HOT range for fluid temperatures of 50° 80°C (122° 176°F). Use COLD range for fluid temperatures of 0° 30°C (32° 86°F).
CAUTION: G Do not overfill.
G Do not reuse any used power steering fluid.
G Recommended fluid is Genuine NISSAN PSF or equivalent. Refer to MA-11, "RECOMMENDED FLUIDS AND LUBRICANTS" .

PFP:KLF20
EGS000U9

LGIA0021E

Checking Fluid Leakage

EGS000UA

Check the hydraulic piping lines for improper attachment and for leaks, cracks, damage, loose connections, chafing or deterioration.

1. Run engine until fluid temperature reaches 50° 80°C (122° 176°F) in reservoir tank. Keep engine speed idle.

2. Turn steering wheel right-to-left several times.

3. Hold steering wheel at each "lock" position for five seconds to check fluid leakage.

CAUTION: Do not hold steering wheel in a locked position for more than 10 seconds. (There is the possibility that oil pump may be damaged.)

SG IA0 50 6E

4. If fluid leakage at connections is noticed, then loosen flare nut and then retighten. Do not over tighten connector as this can damage O-ring, washer and connector.

5. If fluid leakage from oil pump is noticed, check oil pump. Refer to PS-26, "POWER STEERING OIL PUMP" .

6. Check steering gear boots for accumulation of fluid indicating a leak from the steering gear.

Air Bleeding Hydraulic System

EGS000UB

Incomplete air bleeding causes the following. When this happens, bleed air again.
G Air bubbles in reservoir tank.
G Clicking noise in oil pump.
G Excessive buzzing in oil pump.
NOTE: When vehicle is stationary or while steering wheel is being turned slowly, some noise may be heard from oil pump or gear. This noise is normal and does not affect any system.
1. Stop engine, and then turn steering wheel fully to right and left several times.
CAUTION: Do not allow steering fluid reservoir tank to go below the MIN level line. Check tank frequently and add fluid as needed.
2. Run engine at idle speed. Turn steering wheel fully right and then fully left, hold for about three seconds. Then check for fluid leakage.
3. Repeat step 2 several times at about three second intervals.
CAUTION: Do not hold steering wheel in the locked position for more than 10 seconds. (There is the possibility that oil pump may be damaged.)
4. Check for air bubbles or cloudy fluid.
5. If air bubbles or cloudiness still exists, stop engine, perform steps 2 and 3 again until air bubbles or cloudiness does not exist.
6. Stop engine, check fluid level.

Revision: October 2005

PS-6

2005 QX56

STEERING WHEEL

STEERING WHEEL
On-Vehicle Inspection and Service
CHECKING CONDITION OF INSTALLATION

PFP:48430
A
EGS00 0U C

G Check installation condition of steering gear assembly, front suspension, axle and steering column.

G Check if movement exists when steering wheel is moved up and down, to the left and right and to the axial

direction.

End play of the axial direction for steering wheel : 0 mm (0 in)

G Check if the mounting nuts for steering gear assembly are loose. Refer to PS-15, "POWER STEERING GEAR AND LINKAGE" . D

LGIA0024E

CHECKING STEERING WHEEL PLAY

1. Turn tires straight ahead, start engine, then turn steering wheel to the left and right lightly, and measure

steering wheel movement on the outer circumference when steering wheel is turned up to the point where

tires start moving.

Steering wheel play on the outer circumference : 0 - 35 mm (0 - 1.38 in)

CHECKING NEUTRAL POSITION ON STEERING WHEEL

G Check neutral position on steering wheel after confirming that front wheel alignment is correct. Refer to

FSU-6, "Front Wheel Alignment" .

1. Turn tires straight ahead, check if steering wheel is in the neutral position.

2. If it is not in the neutral position, remove steering wheel and reinstall it correctly.

3. If the neutral position cannot be attained by repositioning the steering wheel two teeth or less on steering stem, loosen tie-rod lock nuts of steering outer sockets, then adjust tie-rods by the same amount in the K opposite direction.

CHECKING STEERING WHEEL TURNING FORCE

1. Park vehicle on a level, dry surface and set parking brake.

2. Start engine.

3. Bring power steering fluid up to operating temperature of 60° 80°C (140° 176°F).

4. Tires need to be inflated to specified pressure. Refer to WT-34, "Tire" .

5. Check steering wheel turning force using Tool when steering wheel has been turned 360° from the neutral position.

Tool number : J-44372

Steering wheel : 39 N (4 kg-f, 9 lb-f) or less turning force

6. If steering wheel turning force is out of specification, inspect the following:

G Steering column. Refer to PS-11, "INSPECTION AFTER REMOVAL" .

WGIA0035E

G Power steering oil pump. Refer to PS-26, "CHECKING RELIEF OIL PRESSURE" .

7. If steering column and power steering oil pump meet specifications, replace steering gear. Refer to PS-15, "Removal and Installation" .

Revision: October 2005

PS-7

2005 QX56

STEERING WHEEL

CHECKING FRONT WHEEL TURNING ANGLE When checking front wheel turning angle, refer to FSU-8, "FRONT WHEEL TURNING ANGLE" .
Removal and Installation
REMOVAL 1. Set the front wheels in the straight-ahead position. 2. Remove the driver air bag module. Refer to SRS-46, "Removal and Installation" . 3. Disconnect steering wheel switches. 4. Remove the steering wheel center nut. 5. Remove the steering wheel using Tools.
Tool number A: KV481J0010 (J-1859A)
B: KV481J0010 (J-42578)
CAUTION: Place a piece of tape across the spiral cable so it will not be rotated out of position. 6. Inspect the steering wheel near the puller holes for damage. If damaged, replace the steering wheel. G Remove steering wheel rear cover and steering wheel
switches, if required.
INSTALLATION Installation is in the reverse order of removal. G Align spiral cable correctly when installing steering wheel. Make
sure that the spiral cable is in the neutral position. The neutral position is detected by turning left 2.6 revolutions from the right end position and ending with the knob at the top.

Steering wheel center nut

: 34.3 N·m (3.5 kg-m, 25 ft-lb)

EGS000UD WHIA0124E

WGIA0038E
CAUTION: The spiral cable may snap due to steering operation if the cable is installed in an improper position. Also, with the steering linkage disconnected, the cable may snap by turning the steering wheel beyond the limited number of turns. (The spiral cable can be turned up to 2.6 turns from the neutral position to both the right and left.)

Revision: October 2005

PS-8

2005 QX56

TILT SYSTEM
Removal and Installation
TILT MOTOR AND TILT SENSOR Removal

TILT SYSTEM

PFP:48810
A
EGS000UE
B

1. Tilt sensor

2. Tilt motor

LGIA0022E
H

1. Remove the steering column cover and lower driver instrument panel. Refer to IP-10, "INSTRUMENT

PANEL ASSEMBLY" .

2. Remove knee protector.

3. Disconnect the tilt sensor electrical connector.

4. Remove the two tilt sensor screws and the tilt sensor.

5. Disconnect the tilt motor electrical connector.

6. Remove the tilt motor bolt and the tilt motor. K

Installation Installation is in reverse order of removal.
NOTE: Make sure the tab in the tilt sensor is engaged in the bracket on the tilt motor.

L
LGIA0026E
M

Revision: October 2005

PS-9

2005 QX56

STEERING COLUMN Removal and Installation

STEERING COLUMN

PFP:48810
EGS000UF

1. Driver air bag module

2. Steering wheel

4. Combination switch and spiral cable 5. Steering column assembly

7. Hole cover seal

8. Clamp

10. Hole cover

11. Upper joint

13. Boot clamp

14. Lower joint shaft

WGIA0139E
3. Steering wheel side cover 6. Collar 9. Hole cover mounting plate 12. Upper shaft 15. Boot and clips (plastic)

CAUTION: G Do not exert any load or impact in the axial direction immediately before or after column removal.
G Do not to move steering gear during removal of steering column assembly.
REMOVAL 1. Remove combination switch and spiral cable from steering column assembly. Refer to SRS-48, "Removal
and Installation" . 2. Remove the tilt motor and tilt sensor. Refer to PS-9, "Removal and Installation" .
3. Remove steering column cover, ADP steering switch and ignition key finisher. Refer to IP-10, "Removal and Installation" .

Revision: October 2005

PS-10

2005 QX56

STEERING COLUMN

4. Remove lock nut and bolt, then separate upper shaft from upper

joint.

5. Remove two nuts and two bolts, then remove steering column assembly from steering member.

C
LGIA0027E
D
E

6. Remove hole cover seal and clamp.
7. Remove mounting nuts, then remove hole cover from dash panel.
8. Raise vehicle, then remove mounting bolt (lower side) of lower joint shaft and remove lower joint shaft and upper shaft as an assembly.

LGIA0028E

PS H

INSPECTION AFTER REMOVAL

LGIA0029E

G Check for damage to steering column jacket tube. If damage is found, replace steering column with new

one.

G If vehicle has been in a collision, check column length "L1" and "L2" as shown. If out of specification, replace steering column

with new one.

Steering column length

L1 : 158 mm (6.22 in)

L2 : 262 mm (10.31 in)

G Check for proper lubrication, apply grease as necessary. INSTALLATION Installation is in the reverse order of removal.

Revision: October 2005

PS-11

SG IA0 47 5E
2005 QX56

STEERING COLUMN
CAUTION: G When installing the steering column, finger-tighten all of the lower bracket and joint retaining
bolts; then tighten them to specification. Do not apply undue stress to the steering column. G The lower nut on the upper joint may not be reused. NOTE: Align slit of the coupling joint with projection on dust cover. Insert the joint until surface "A" contacts surface "B". G After installation, turn steering wheel to make sure it moves
smoothly. Make sure the number of turns are the same from the straight-forward position to left and right locks. Make sure that the steering wheel is in a neutral position when driving straight ahead. G When installing steering column to steering member, install mounting nut from front side of vehicle.
SST491C
INSPECTION AFTER INSTALLATION G After installing steering column to vehicle, check tilt device and its operation range is as specified.
Range "A" : 61.3 mm (2.41 in) G Check if steering wheel operation can turn to the end of the left
and right stops smoothly.
WGIA0083E

Revision: October 2005

PS-12

2005 QX56

STEERING COLUMN Disassembly and Assembly

EGS000UG
A

1. Steering column assembly 4. Tamper resistant self-shear screw

2. Upper joint

3. Ignition switch

WGIA0091E
K

DISASSEMBLY

1. Remove mounting bolt from upper joint, then remove upper joint from steering column assembly.

2. Remove ignition switch tamper resistant self-shear screws with a drill or other suitable tool.

Revision: October 2005

PS-13

2005 QX56

STEERING COLUMN
ASSEMBLY G Assembly is in the reverse order of disassembly. G Install new tamper resistant self-shear screws.

WGIA0009E
INSPECTION AFTER ASSEMBLY
When the steering wheel does not turn smoothly, check the steering column as follows:
1. Check the column bearings for damage or unevenness. Lubricate with recommended multi-purpose grease. Replace the steering column as an assembly, if necessary.
2. Check the column tube for deformation or breakage. Replace the steering column as an assembly, if necessary.
3. If the vehicle has been involved in a collision, or if noise and rattles are heard during a turn, check the length "L" of the column. If out of specification, replace the steering column as an assembly.

Steering column length "L" : 610 mm (24.02 in)
4. Check for proper lubrication, apply grease as necessary. 5. Check for wear around the seal edges, replace the steering col-
umn as an assembly as necessary. 6. Check for corrosion or pitting around the seal sliding area.

WGIA0080E

7. After installing the steering column, check the tilt mechanism for proper operation.
Tilt mechanism range : 3° per notch at 5 stops (Manual tilt)
CAUTION: G Replace the column if it is depleted of grease, worn, dam-
aged, or if any scratches or coating separation is present on the shaft seal area.
G During lower joint detachment, insert a tool into the yoke groove to prevent gouging damage.

WGIA0026E

Revision: October 2005

PS-14

2005 QX56

POWER STEERING GEAR AND LINKAGE
POWER STEERING GEAR AND LINKAGE Removal and Installation

PFP:49001
A
EGS00 0U H
B

1. Cotter pin 4. Washer

2. Mounting bracket 5. Steering gear assembly

3. Bushing 6. Mounting insulator

WGIA0092E

PS H

CAUTION:

Spiral cable may snap due to steering operation if steering column is separated from steering gear

assembly. Therefore secure steering wheel to avoid turning.

REMOVAL

1. Turn wheels to the straight-ahead position.

2. Remove tires from vehicle using power tool.

3. Remove undercover using power tool.

4. On 4WD model, remove front final drive, then support drive shafts with wire. Refer to FFD-11, "Removal and Installation" .

5. Remove cotter pin at steering outer socket and discard, then loosen mounting nut.

6. Remove steering outer socket from steering knuckle using Tool. Be careful not to damage ball joint boot.

CAUTION:

Temporarily tighten mounting nut to prevent damage to

threads and to prevent Tool from coming off.

Tool number : HT72520000 (J-25730-A)

SDIA1434E
7. On 2WD model, remove stabilizer bar mounting bolts and reposition stabilizer bar. Refer to FSU-12, "STABILIZER BAR" .

Revision: October 2005

PS-15

2005 QX56

POWER STEERING GEAR AND LINKAGE
8. Remove oil piping (high pressure side and low pressure side) from steering gear assembly, then drain fluid from piping.

9. Remove lower joint mounting bolt of lower shaft.

LGIA0032E

10. Remove mounting bolts and nuts of steering gear assembly using power tool, and then remove steering gear assembly from vehicle.

LGIA0029E

LGIA0024E
INSTALLATION
Installation is in the reverse order of removal.
G After removing/installing or replacing steering components, check wheel alignment. Refer to FSU-6, "Front Wheel Alignment" .
G After adjusting wheel alignment, adjust neutral position of steering angle sensor. Refer to BRC-62, "Adjustment of Steering Angle Sensor Neutral Position" .
G With steering wheel in straight ahead position, make sure slit of lower joint fits with the projection on rear cover cap, while checking that mark on steering gear assembly aligns with mark on rear cover cap

SST491C
G After installation, bleed the air from the steering hydraulic system. Refer to PS-6, "Air Bleeding Hydraulic System" .

Revision: October 2005

PS-16

2005 QX56

POWER STEERING GEAR AND LINKAGE

INSPECTION AFTER INSTALLATION Check if steering wheel turns smoothly when it is turned several times fully to the left and right lock positions. A

Disassembly and Assembly

EGS000UI

1. Outer socket 4. Inner socket 7. Cylinder tubes 10. O-ring 13. Rack assembly 16. End cover assembly

2. Boot clamp (small) 5. Boot clamp (large) 8. Rear cover cap 11. Sub-gear assembly 14. Rack Teflon® ring

K
WGIA0093E

3. Boot

6. Gear housing assembly

9. Rear cover

12. Rack oil seal

15. O-ring

CAUTION: G Secure steering gear assembly with a vise, using copper plates or something similar to prevent it
from being damaged. Do not grip cylinder with a vise.
G Before performing disassembly, clean steering gear assembly with kerosene. Be careful not to bring any kerosene into contact with the discharge and return port connectors.

DISASSEMBLY 1. Remove cylinder tubes from gear housing assembly. 2. Remove rear cover cap from gear housing assembly.

Revision: October 2005

PS-17

2005 QX56

POWER STEERING GEAR AND LINKAGE
3. Measure adjusting screw height from gear housing assembly, then loosen adjusting screw. CAUTION: G Do not turn adjusting screw more than twice. G Replace steering gear assembly when adjusting screw is removed or more than twice.
4. Use a Tool to remove rear cover from sub-gear assembly. Tool number : -- (J-46213)

SG IA0 56 8E

5. Remove O-ring with a flat-bladed screwdriver, and pull out rear cover.

SG IA0 50 7E

SG IA0 50 8E
6. Remove sub-gear assembly from gear housing assembly. CAUTION: In order to protect oil seal from any damage, pull sub-gear assembly straight out.
7. Loosen lock nut of outer socket, and remove outer socket. 8. Remove boot clamps of the small diameter side and the large diameter side, then remove boot.
CAUTION: When removing boots, be careful not to damage inner socket and gear housing assembly. If they are damaged, replace them to avoid fluid leaks. 9. Drill out the clinching part of cylinder outer rim with a 3 mm (0.12 in) drill bit, drill to a depth of 1.5 mm (0.059 in).

Revision: October 2005

PS-18

STC0013D
2005 QX56

POWER STEERING GEAR AND LINKAGE

10. Remove end cover assembly with a 45 mm (1.77 in) open head

wrench or suitable tool.

CAUTION:

Be careful not to damage gear housing assembly. If it is

damaged, replace gear housing assembly. Otherwise, fluid

leaks may result.

11. Pull rack assembly with oil seal out of gear housing assembly.

SST081B
D

CAUTION: Be careful not to damage cylinder. If it is damaged, replace gear housing assembly. Otherwise, E fluid leaks may result.

12. Heat rack Teflon® ring to approximately 40°C (104°F) with a

dryer, then remove it and O-ring from rack assembly.

CAUTION:

Be careful not to damage rack assembly. If it is damaged,

replace with a new one to avoid fluid leaks. PS

13. Use a taped 29 mm (1.14 in) socket and an extension bar. Remove rack oil seal from gear housing assembly.
CAUTION: Be careful not to damage gear housing assembly and cylinder inner wall. If it is damaged, gear housing assembly must be replaced. Otherwise, fluid leaks will result.

H
SG IA0 15 1E
I
J
K

L
SG IA0 17 9E
M

Revision: October 2005

PS-19

2005 QX56

POWER STEERING GEAR AND LINKAGE
INSPECTION AFTER DISASSEMBLY Boot Check boot for cracks and deformation. Replace if necessary.
Rack Assembly Check rack gear for damage and wear. Replace if necessary.
Sub-Gear Assembly G Check pinion gear for damage and wear. Replace if necessary. G Check bearing while rotating it. Replace bearing if bearing ball race was dented, worn, or damaged.
Gear Housing Assembly Check gear housing assembly for damage and scratches (inner wall). Replace if necessary.
Outer Socket and Inner Socket Swing Torque Hook a spring balance at the point shown in the figure. Confirm if the reading is within the specification. When ball stud and inner socket start moving the measured value must be within the specification. If the reading is outside the specification, replace socket.

SG IA0 54 7E

Item

Outer socket

Measuring point Swing torque Measuring value

Cotter pin hole of stud 0.3 - 2.9 N·m (0.03 - 0.29 kg-m, 3 - 25 in-lb)
4.84 - 46.7 N (0.50 - 4.7 kg, 4 - 34 lb)

Outer Socket and Inner Socket Rotating Torque
Using Tool, check if reading is within the value specified below. If the value is outside the standard, replace outer sockets.

Tool number : ST3127S000 (J-25765-A)

Inner socket Shown as "L": 83.2 mm (3.276 in) 1.0 - 7.8 N·m (0.11 - 0.79 kg-m, 9 - 69 in-lb) 12.1 - 93.7 N (1.3 - 9.5 kg, 9 - 69 lb)

Rotating torque : 0.3 - 2.9 N·m (0.03 - 0.29 kg-m, 3 - 25 in-lb)

Outer Socket and Inner Socket Axial End Play Apply load of 490 N (50 kg, 110 lb) to ball stud axially. Use a dial gauge to measure the amount of the movement that the stud makes. Check if the reading is within specification. If the value is outside specification, replace outer and inner sockets.
Outer socket : 0.5 mm (0.020 in) or less
Inner socket : 0.2 mm (0.008 in) or less

Revision: October 2005

PS-20

SST882B
SG IA0 05 7E
2005 QX56

POWER STEERING GEAR AND LINKAGE

ASSEMBLY

1. Apply Genuine NISSAN PSF or equivalent to O-ring. Put an O-ring into rack Teflon® ring.

G Refer to MA-11, "RECOMMENDED FLUIDS AND LUBRICANTS" .

CAUTION:

Do not reuse O-ring.

2. Heat rack Teflon® ring to approximately 40°C (104°F) with a

dryer. Assemble it to mounting groove of rack.

CAUTION:

Do not reuse rack Teflon® ring.

SG IA0 15 3E

3. To fit rack Teflon® ring on rack, use rack Teflon® ring installation tool from tooth side. Compress rim of F ring using Tool.

Tool number : KV48104400 ( -- )

SG IA0 15 4E
J 4. Apply multi-purpose grease to rack oil seal. Insert rack oil seal, then insert rack assembly to gear housing
assembly. Refer to MA-11, "RECOMMENDED FLUIDS AND LUBRICANTS" .

CAUTION:

G Do not reuse rack oil seal.

G When inserting rack assembly, do not damage retainer sliding part. If it is damaged, replace gear housing assembly. L
G When inserting rack assembly, do not damage cylinder inner wall. If it is damaged, it may cause oil leaks. Replace gear housing assembly.

G Attach rack oil seal. Both inner lip and outer lip should face each other.

Revision: October 2005

PS-21

SG IA0 20 5E
2005 QX56

POWER STEERING GEAR AND LINKAGE
a. To avoid damaging inner rack oil seal, wrap an OHP sheet [approximately 70 mm (2.76 in) × 100 mm (3.94 in)] around rack teeth. Place oil seal on sheet. Then, pull oil seal along with OHP sheet until they pass the toothed section of rack, then remove sheet.
b. Insert rack oil seal (inner) to piston (rack Teflon® ring) position and push retainer to adjust screw side with fingers lightly. Then make rack move in gear housing assembly and install rack oil seal (inner) to fit with gear housing assembly.
c. When installing outer rack oil seal, cover the end of rack with an OHP sheet [70 mm (2.76 in) × 100 mm (3.94 in)]. It will avoid damaging rack oil seal. Then place oil seal on sheet. Pull rack oil seal along with OHP sheet until they pass rack end, then remove sheet.
d. Install end cover assembly to rack, move it to gear housing assembly. 5. Using a 45 mm (1.77 in) open head wrench or suitable tool,
tighten end cover assembly to specification. CAUTION: Do not damage rack surface. If it is damaged, it may cause oil leaks. Replace rack assembly.

SG IA0 15 5E WGIA0095E SG IA0 15 7E SST081B

Revision: October 2005

PS-22

2005 QX56

POWER STEERING GEAR AND LINKAGE

6. After tightening end cover assembly, caulk cylinder at one point

as shown using a punch. This will prevent end cover from get-

ting loose.

SG IA0 15 8E
D

7. Install sub-gear assembly to gear housing assembly.

CAUTION:

Oil seal may be damaged if sub-gear assembly is not installed correctly.

8. Apply Genuine NISSAN PSF or equivalent to O-ring. Refer to MA-11, "RECOMMENDED FLUIDS AND LUBRICANTS" . Then install O-ring to rear cover.

NOTE:

Do not reuse O-ring.

9. Install rear cover to gear housing assembly using Tool. PS
Tool number : -- (J-46213)

10. Make sure projection on rear cover cap aligns with mark on gear housing assembly.

11. Apply thread locking sealant (Refer to GI-45, "RECOMMENDED

CHEMICAL PRODUCTS AND SEALANTS" ) to the thread of

the adjusting screw. Then set adjusting screw height from gear

housing assembly. The adjusting screw height is the same as it

was measured previously.

12. Rotate pinion ten times through entire rack range to seat gears and to check operation.
13. With steering gear in neutral position, measure pinion rotating torque using Tool from within 180° to +180°, while applying and holding maximum torque to pinion gear.
Tool number : ST3127S000 (J25765-A), KV48103400 ( -- )

SG IA0 56 8E

SG IA0 48 3E
14. After loosening adjusting screw once, tighten it again with torque of 5.4 N·m (0.55 kg-m, 48 in-lb). Then loosen it within 20° 40°.

Revision: October 2005

PS-23

2005 QX56

POWER STEERING GEAR AND LINKAGE
15. Measure pinion rotating torque using Tool, then confirm whether the reading is within the specified value. If the reading is not within the specified value, readjust screw angle with adjusting screw. If the reading is still not within the specified value or the rotating torque of adjusting screw is less than 5 N·m (0.51 kg-m, 44 in-lb), replace the steering gear assembly.
Pinion rotating torque: Around neutral position (within ±100°)
Average "A": 0.8 - 2.0 N·m (0.09 - 0.20 kg-m, 7 - 17 in-lb)
Other than above (more than ±100°) Maximum variation "B":
2.3 N·m (0.23 kg-m, 20 in-lb)
16. Turn pinion to the full left lock position with inner socket to gear housing assembly. 17. Mount dial gauge to rack as shown. Measure vertical movement
of rack when pinion is turned counterclockwise with torque of 19.6 N·m (2.0 kg-m, 14 ft-lb). Check if reading is within the specified value. If reading is outside of the specification, readjust screw angle with adjusting screw. 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 the steering gear assembly.

SG IA0 16 0E

SG IA0 48 4E

Amount of vertical movement with rack

Less than 0.265 mm (0.010 in)

Measuring point

Axial direction of rack Radius direction of rack

5 mm (0.197 in) away from end of gear housing
Shaft direction of adjusting screw

18. Install large-diameter side of boot to gear housing assembly.
19. Install small-diameter side of boot to the mounting groove of inner socket boot.
20. Install boot clamp to the small-diameter side of boot.

SG IA0 55 0E

Revision: October 2005

PS-24

2005 QX56

POWER STEERING GEAR AND LINKAGE
21. Install new boot clamps and crimp securely. CAUTION: Do not reuse boot clamps.
22. Install cylinder tubes to gear housing assembly. 23. Install lock nut and outer socket to inner socket. 24. Tighten lightly tie-rod in specified length "L", then tighten lock nut
at specified torque. Refer to PS-17, "Disassembly and Assembly" . Reconfirm if tie-rod length is within limit of specified length "L".
Inner socket length "L" : 115.2 mm (4.54 in) CAUTION: Perform toe-in adjustment after this procedure. Length achieved after toe-in adjustment is not necessarily the value given here.

AST139

PS H

SG IA0 16 7E

Revision: October 2005

PS-25

2005 QX56

POWER STEERING OIL PUMP

POWER STEERING OIL PUMP
On-Vehicle Inspection and Service
CHECKING RELIEF OIL PRESSURE
CAUTION: Before starting work, confirm belt tension is proper.
1. Connect Tool between oil pump discharge connector and high pressure hose and then bleed air from the hydraulic circuit.

PFP:49110
EGS000UJ

Tool number:

Pressure gauge and shut-off valve

KV48103500 (J26357 and J26357-10)

Oil pump side

Connector A and O-ring

KV48105300-4 and 5295262U10 (--)

Eye-bolt and O-ring

KV48105300-3 and 5295262U00 (--)

High pressure piping side

Connector B and O-ring
Nut

KV48105300-1 and 5295262U00 (--)
KV48105300-2 (-- )

SG IA0 57 0E

2. Start engine. Allow engine to run until tank temperature reaches 50 80°C (122 176°F). CAUTION: G Warm up engine with shut-off valve fully opened. If engine is started with shut-off valve closed, fluid pressure in power steering pump increases to maximum. This will raise fluid temperature excessively. G Be careful not to contact hose with belt when engine is started.
3. With engine at idle, close shut-off valve and read the relief oil pressure.
Relief oil pressure : 9.0 9.8 mPa (91.77 99.93 kg/cm2 , 1305.34 1421.37 psi)

CAUTION: Do not close shut-off valve of pressure gauge for more than 10 seconds.
4. After measurement, open shut-off valve slowly.
G If relief oil pressure is outside the specification, disassemble and repair oil pump. Refer to PS-17, "Disassembly and Assembly" .
5. After inspection, disconnect oil pressure gauge and oil pressure gauge adapter from hydraulic circuit, connect oil pump discharge connector and high pressure hose. Add fluid and bleed air from hydraulic circuit thoroughly. Refer to PS-6, "Air Bleeding Hydraulic System" .

Removal and Installation
REMOVAL

EGS000UK

1. Drain power steering fluid from reservoir tank.

2. Remove engine room cover. Refer to EM-11, "Removal and Installation" .

3. Remove air duct assembly. Refer to EM-14, "Removal and Installation" .

4. Remove power steering reservoir tank.

5. Remove serpentine drive belt belt from auto tensioner and power steering pump. Refer to EM-12, "Removal and Installation" .

6. Disconnect pressure sensor electrical connector.

7. Remove high pressure and low pressure piping from power steering oil pump. Refer to PS-31, "HYDRAULIC LINE" .

8. Remove mounting bolts, then remove power steering pump.

INSTALLATION

Installation is in the reverse order of removal. Refer to PS-31, "HYDRAULIC LINE" for tightening torque.

G After installation, bleed air. Refer to PS-6, "Air Bleeding Hydraulic System" .
NOTE: Belt tension is automatic and requires no adjustment.

Revision: October 2005

PS-26

2005 QX56

POWER STEERING OIL PUMP Disassembly and Assembly

EGS000UL
A

1. Bracket 4. Lock pin 7. Vane 10. O-ring 13. Drive shaft assembly 16. Spring washer 19. Connector bolt 22. Suction pipe

2. Rear cover 5. Cam ring 8. Cartridge 11. Body assembly 14. Snap ring 17. Flow control valve 20. Copper washer 23. O-ring

3. Gasket 6. Rotor 9. Side plate 12. Oil seal 15. Pulley 18. Pressure sensor 21. Bracket

WGIA0076E

INSPECTION BEFORE DISASSEMBLY

Disassemble power steering oil pump only if the following conditions are found.

G Oil leakage from oil pump

G Deformed or damaged pulley

G Poor performance

DISASSEMBLY

CAUTION:

When retaining drive shaft in a vise, always use copper or aluminum plates between vise and shaft.

NOTE:

Mount the oil pump in a vise as needed.

1. Unscrew three bracket bolts and remove bracket from rear cover.

2. Unscrew four rear cover bolts and remove rear cover from body assembly.

3. Remove gasket from body assembly.

4. Remove lock pin, cartridge and side plate from body assembly.

5. Remove pulley from drive shaft assembly.

Revision: October 2005

PS-27

2005 QX56

POWER STEERING OIL PUMP
6. Remove snap ring from drive shaft assembly, then press out drive shaft assembly. CAUTION: When removing snap ring, be careful not to damage drive shaft assembly.
7. Using a screwdriver, remove oil seal from body assembly.

SST010B

8. Remove O-ring from body assembly.
9. Remove connector bolt, then flow control valve and spring from body assembly.
CAUTION: Be careful not to drop and deform the flow control valve.

SST034A

SG IA0 52 4E
10. Remove suction pipe from body assembly. 11. Remove O-ring for suction pipe.
INSPECTION AFTER DISASSEMBLY Body Assembly and Rear Cover Inspection G Check body assembly and the inside of rear cover for damage. If any damage is found, replace with new
part for rear cover and replace with new power steering pump assembly for body assembly.
Cartridge Assembly Inspection G Check cam ring, side plate, rotor and vane for damage. If any damage is found, replace cartridge assem-
bly with new one.
ASSEMBLY CAUTION: When retaining drive shaft assembly in a vise, always use copper or aluminum plates between vise and shaft. NOTE: Mount the oil pump in a vise as needed. 1. Apply a coat of Genuine NISSAN PSF or equivalent to oil seal lip and to the circumference of oil seal.
Refer to MA-11, "RECOMMENDED FLUIDS AND LUBRICANTS" .

Revision: October 2005

PS-28

2005 QX56

POWER STEERING OIL PUMP

2. Install oil seal to body assembly using suitable tool.

NOTE:

Do not reuse oil seal.

SST038A
D 3. Apply a coat of Genuine NISSAN PSF or equivalent to drive shaft assembly and press drive shaft assem-
bly into body assembly with suitable tool, then install snap ring.

NOTE:

Do not reuse snap ring.

4. Apply a coat of Genuine NISSAN PSF or equivalent to O-ring and install O-ring into body assembly.

NOTE:

Do not reuse O-ring.

5. Install side plate to body assembly.

6. Install lock pin into lock pin hole, and install cam-ring as shown.
G When installing cam ring, align letter "E" to rear cover as shown.
CAUTION: Do not confuse the assembling direction of cam ring. If cam ring is installed facing the incorrect direction, it may cause pump operation malfunction.

I
SG IA0 42 2E
J
K
L
M

7. Install rotor to body assembly. Revision: October 2005

PS-29

WGIA0079E
2005 QX56

POWER STEERING OIL PUMP
G When installing rotor, the punch mark on the face of the rotor faces the body assembly.
8. Install vane to rotor with round portion facing outside.

SG IA0 42 4E

SST843A
9. Check if drive shaft assembly turns smoothly. 10. Install gasket to body assembly.
NOTE: Do not reuse gasket. 11. Install rear cover to body assembly and tighten bolts to the specified torque. 12. Install bracket to rear cover and tighten bolts at the specified torque. 13. Install pulley to drive shaft assembly then tighten lock nut at the specified torque. 14. Install spring and flow control valve, copper washers, joint and connector bolt to body assembly. Then tighten connector bolt to the specified torque. NOTE: Do not reuse O-ring. 15. Apply a coat of Genuine NISSAN PSF or equivalent to O-ring, then install O-ring to suction pipe. NOTE: Do not reuse O-ring. 16. Install suction pipe to body assembly.

Revision: October 2005

PS-30

2005 QX56

HYDRAULIC LINE
HYDRAULIC LINE Removal and Installation
Refer to the following illustration for hydralic line removal.

PFP:49721
A
EG S00 0UM
B C D E F PS H I J K L M

1. Reservoir tank 4. Oil cooler 7. Eye bolt
Revision: October 2005

2. Suction hose 5. Steering gear assembly
PS-31

3. High pressure hose 6. Reservoir tank bracket

WGIA0096E

2005 QX56

HYDRAULIC LINE
Installation is in the reverse order of removal. G Confirm mating marks are aligned with hose and clamp, then
correct if needed.
G To install eye joint, align projection of eye joint with notch of power steering pump, and attach eye joint to power steering pump properly. Tighten eye bolt by hand fully, then torque to specification.

SG IA0 56 3E WGIA0089E

Revision: October 2005

PS-32

2005 QX56

SERVICE DATA AND SPECIFICATIONS (SDS)

SERVICE DATA AND SPECIFICATIONS (SDS) Steering Wheel
End play of the axial direction for steering wheel Steering wheel play on the outer circumference Steering wheel turning force
Steering Column
Inspection After Assembly

0 mm (0 in) 0 - 35 mm (0 - 1.38 in) 39 N (4 kg-f, 9 lb-f) or less

PFP:00030
A
EGS00 0U N
B

EGS000UO

Unit: mm (in)
D

Steering column length "L"
Inspection After Removal

WGIA0080E

PS
610 (24.02)
H
Unit: mm (in)
I

Steering column length "L2" Steering column length "L1"

SG IA0 47 5E

K
L
262 (10.31) 158 (6.22)
M

Revision: October 2005

PS-33

2005 QX56

SERVICE DATA AND SPECIFICATIONS (SDS)
Inspection After Installation

Range "A" Tilt mechanism range (Manual tilt)
Steering Outer Socket and Inner Socket

WGIA0083E

61.3 mm (2.41 in) 3° per notch at 5 steps
EGS000UP

Tie-rod ball joint outer socket Tie-rod ball joint inner socket

SG IA0 35 8E
Swinging torque Measurement on spring balance G Measuring point: cotter pin hole of stud Rotating torque Axial end play Swinging torque Measurement on spring balance G Measuring point: "L" mark see above,
"L"=83.2 mm (3.276 in). Axial end play

0.3 - 2.9 N·m (0.03 - 0.29 kg-m, 3 - 25 in-lb) 4.84 - 46.7 N (0.50 - 4.7 kg, 4 - 34 lb)
0.3 - 2.9 N·m (0.03 - 0.29 kg-m, 3 - 25 in-lb) 0.5 mm (0.020 in) or less
1.0 - 7.8 N·m (0.11 - 0.79 kg-m, 9 - 69 in-lb)
12.1 - 93.7 N (1.3 - 9.5 kg, 9 - 69 lb)
0.2 mm (0.08 in) or less Unit: mm (in)

Inner socket length "L"
Revision: October 2005

SG IA0 16 7E
PS-34

115.2 (4.54)
2005 QX56

SERVICE DATA AND SPECIFICATIONS (SDS)

Steering Gear
Steering gear model Rack neutral position, dimension "L" (rack stroke)

PR26AM 85.5 mm (3.36 in)

EGS0014O
A
B

Rack sliding force
Oil Pump

At the neutral point: Range within ± 11.5 mm (±0.453 in) from the neutral position (in power ON)

Relief oil pressure
Steering Fluid

Fluid capacity

E
STC0034D

Area average value

250.1 - 308.9 N (25.5 - 31.5 kg, 56.2 - 69.5 lb)

Area minimum value

200 N (20.4 kg, 45 lb)

Allowable variation

98 N (10 kg, 22 lb) or less

PS EGS000UR
9.0 - 9.8 mPa (91.77 - 99.93 kg/cm2 , 1305.34 - 1421.37 psi)
H
EGS000US
Approx. 1.0 (1-1/8 US qt, 7/8 Imp qt)
I

Revision: October 2005

PS-35

2005 QX56

SERVICE DATA AND SPECIFICATIONS (SDS)

Revision: October 2005

PS-36

2005 QX56

FrameMaker SGML 5.5.6p145 Acrobat Distiller 4.05 for Windows