Infiniti M45 (Y34). Manual - part 709

POWER STEERING OIL PUMP

PS-27

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PRE-DISASSEMBLY INSPECTION

Disassemble power steering oil pump only if following items are
found.

●

Oil leak from any point shown in the figure

●

Deformed or damaged pulley

●

Poor performance 

DISASSEMBLY

NOTE:
Fix oil pump in vise as the occasion demands.

CAUTION:

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

1.

Unscrew four rear cover bolts and remove rear cover from housing.

2.

Remove gasket from body assembly.

3.

Remove lock pin, cartridge and side plate from housing.

4.

Remove pulley from drive shaft assembly.

5.

Remove snap ring from drive shaft assembly and press out it.

CAUTION:

When removing snap ring, be careful not to damage drive
shaft assembly.

6.

Using a screwdriver, remove oil seal from housing.

7.

Remove O-ring from housing.

19. O-ring

20. Connector bolt

21. Joint

22. Spring washer

23. Cartridge

SGIA0419E

SST010B

SST034A

PS-28

POWER STEERING OIL PUMP

8.

Loosen lock nut and remove washer, joint then remove connec-
tor bolt, O-ring and pull out flow control valve and spring from
housing.

CAUTION:

Be careful not to drop and deform flow control valve. 

9.

Remove suction pipe from housing

10. Remove O-ring from housing.

INSPECTION AFTER DISASSEMBLY
Housing and Rear Cover Inspection 

●

Check housing 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 housing

Cartridge Assembly Inspection

●

Check cam ring, side plate, rotor and vane for damage. If any damage is found, replace cartridge assem-
bly with new one.

ASSEMBLY

NOTE:
Fix oil pump in vise as vise occasion demands.

CAUTION:

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

1.

Apply a coat of Genuine Nissan PSF or equivalent to oil seal lip
and to the circumference of oil seal. Using proper tool, such as
hand press machine, install it to housing.
NOTE:
Do not reuse oil seal.

2.

Apply a coat of Genuine Nissan PSF or equivalent to drive shaft
assembly and press drive shaft assembly into housing with suit-
able tool, then install snap ring.

NOTE:
Do not reuse snap ring.

3.

Apply a coat of Genuine Nissan PSF or equivalent to O-ring and
install O-ring into housing.

NOTE:
Do not reuse O-ring.

4.

Install side plate to housing.

SST036A

SST038A

SGIA0422E

POWER STEERING OIL PUMP

PS-29

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5.

Install lock pin into lock pin hole, and install cam-ring as shown
in the figure.

NOTE:
Do not reuse oil O-ring.

●

When installing cam-ring, turn carved face with a letter (E) of
it to rear cover.

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.

6.

Install rotor to housing.

●

When installing rotor, turn punch mark face on rotor to hous-
ing.

7.

Install vane to rotor with facing the round portion outside.

8.

Check if drive shaft assembly turns smoothly.

9.

Install gasket to housing.

NOTE:
Do not reuse gasket.

SST497A

SST289A

SST843A

PS-30

POWER STEERING OIL PUMP

10. Install rear cover to housing and tighten bolts at the specified

torque.

11. Install pulley to drive shaft assembly then tighten lock nut at the

specified torque.

12. Install spring, flow control valve, O-ring, connector bolt, joint,

washer to housing. Then tighten lock nut at the specified torque.

NOTE:
Do not reuse O-ring.

13. Apply a coat of Nissan PSF or equivalent to O-ring and install O-

ring to housing.
NOTE:
Do not reuse O-ring.

14. Install suction pipe to housing.

SGIA0425E