Infiniti QX56 (Z62). Manual - part 1095

PRESSURE REDUCING METHOD

SCS-17

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PRESSURE REDUCING METHOD

Work Procedure

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CAUTION:

• Clean surrounding areas of oil injection jack using steam before starting operation, since there may

be mud on it.

• Clean oil pressure gauge (special service tool: KV40108000) jack with steam before use.

1.

Lift up the vehicle.

2.

Remove protector of PPMU.

3.

Remove cap of oil injection jack.

4.

Install an oil pressure gauge (SST: KV40108000) (A) to oil injec-
tion jack. 

CAUTION:

• Jack must be securely inserted until a click sound can be

heard.

• Pressure reducing valve (B) of the oil pressure gauge

must be closed.

5.

Loosen needle valves A, C, and E of PPMU by approximately 2
rotations.

CAUTION:

Never loosen the needle valve more than required.

6.

Loosen pressure reducing valve (A) of oil pressure gauge and
then lower pressure.

CAUTION:

Be careful since oil drains swiftly from oil drain hole (B).

7.

Check that reading of oil pressure gauge is 0 MPa.

8.

Tighten needle valves A, C, and E of PPMU to the specified
torque.

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Tightening torque

: 8.3 N·m (0.85 kg-m, 73 in-lb)

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AIR BLEEDING METHOD

AIR BLEEDING METHOD

Work Procedure

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WARNING:

• Always check the piping for loose connections, damage, or twists before starting operation, since

pressure in hydraulic circuit becomes high during operation.

• When repairing or replacing a malfunctioning part, always release pressure from hydraulic circuit,

since dangerous conditions may be created when oil leakage occurs during air bleeding operation.

CAUTION:

• Clean surrounding areas of oil injection jack and air bleeder using steam before starting operation,

since there may be mud on it.

• Clean suspension oil pump (special service tool: KV40107700) jack with steam before use.
• Check system pressure again 1 day or more after bleeding operation is complete, since system pres-

sure may decrease when air bleeding is insufficient.

1.

Lift up the vehicle.

2.

Remove protector of PPMU.

3.

Remove cap of oil injection jack.

4.

Install hose (A) of a suspension oil pump (SST: KV40107700) to
oil injection jack. 

CAUTION:

Jack must be securely inserted until a click sound can be
heard.

5.

Loosen pressure reducing valve (A) of hose portion of suspen-
sion oil pump.

6.

Set knob (A) of suspension oil pump to the direction as shown in
the figure.

7.

Close pressure reducing valve of hose portion of suspension oil
pump while sending oil by applying pressure using suspension
oil pump. (Air bleeding in hose is complete.)

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AIR BLEEDING METHOD

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8.

Loosen needle valves A, C, and E of PPMU by approximately 2
rotations.

CAUTION:

Never loosen the needle valve more than required.

9.

Install bleeder tube and drain tank to bleeder valve in upper side
of rear shock absorber RH.

10. Loosen bleeder valve and bleed air while sending oil by applying

pressure using suspension oil pump, and then quickly tighten air
bleeder.

CAUTION:

Be careful that oil in suspension oil pump is not at half or
less.

11. Repeat step 10 until no air appears in bleeder tube.

12. Tighten bleeder valve to the specified torque. Refer to 

SCS-32, "FRONT TUBE ASSEMBLY : Exploded

View"

 (front shock absorber), 

SCS-39, "PPMU, MIDDLE TUBE ASSEMBLY, PPMU PIPE : Exploded

View"

 (upper side of rear shock absorber).

13. Perform operation according to steps 9 to 12 in the order of rear shock absorber RH (lower side) 

→

 front

shock absorber RH (upper side and lower side) 

→

 rear shock absorber LH (upper side and lower side) 

→

front shock absorber LH (upper side and lower side).

14. Repeat steps 9 to 13 (2nd turn).

15. Refer to the figure and send oil by applying pressure.

16. Tighten needle valves A, C, and E of PPMU to the specified torque.

17. Set knob (A) of suspension oil pump to the direction as shown in

the figure and check that reading of pressure gauge is 0 MPa.

18. Remove hose of suspension oil pump.

19. Install cap of oil injection jack.

20. Install protector of PPMU. Refer to 

SCS-39, "PPMU, MIDDLE

TUBE ASSEMBLY, PPMU PIPE : Exploded View"

.

Lower side of rear shock absorber

Tightening torque

: 8.3 N·m (0.85 kg-m, 73 in-lb)

JSEIA0187ZZ

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Tightening torque

: 8.3 N·m (0.85 kg-m, 73 in-lb)

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CHECK INTERNAL LEAKAGE

CHECK INTERNAL LEAKAGE

Work Procedure

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CAUTION:

• Clean surrounding areas of oil injection jack using steam before starting operation, since there may

be mud on it.

• Clean oil pressure gauge (special service tool: KV40108000) jack with steam before use.

1.

Remove protector of PPMU.

2.

Remove cap of oil injection jack.

3.

Install an oil pressure gauge (SST: KV40108000) (A) to oil injec-
tion jack.

CAUTION:

• Jack must be securely inserted until a click sound can be

heard.

• Pressure reducing valve (B) of the oil pressure gauge

must be closed.

4.

Loosen needle valves A, C, and E of PPMU by approximately 2 rotations.

CAUTION:

Never loosen the needle valve more than required.

5.

Lift up the vehicle.

CAUTION:

Check that tires never contact the ground.

6.

Tighten needle valves C and E of PPMU.

7.

Loosen lock nut of needle valve D of PPMU and then tighten
needle valve D.

8.

Lift down the vehicle.

CAUTION:

Check that the lift is fully lowered.

9.

Write down a value of the oil pressure gauge after 5 minutes.

10. Tighten needle valve A of PPMU.

11. Loosen lock nut of needle valve B of PPMU and then tighten needle valve B.

12. Loosen needle valve C of PPMU by approximately 2 rotations.

CAUTION:

Never loosen the needle valve more than required.

13. Read a value of oil pressure gauge.
14. Compare difference of reading with pressure reading in step 9.

15. Tighten needle valves A, C, and E of PPMU to the specified torque.

16. Loosen needle valves B and D of PPMU by approximately 2 rotations and then tighten lock nut to the

specified torque.

CAUTION:

Never loosen the needle valve more than required.

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Pressure difference

0.1 MPa or more

: Normal

0.1 MPa or less

: Malfunction

: 8.3 N·m (0.85 kg-m, 73 in-lb)

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