Infiniti Q45 (FY33). Manual - part 539

SST308B

Checking Gear Housing Movement

Check the movement of steering gear housing during station-
ary steering on a dry paved surface.

Apply a force of 49 N (5 kg, 11 lb) to steering wheel to check
the gear housing movement.
Turn off ignition key while checking.

Movement of gear housing:

±2 mm (±0.08 in) or less

If movement exceeds the limit, replace mount insulator after
confirming proper installation of gear housing clamps.

SST839C

Adjusting Rack Retainer

Perform this driving test on a flat road.

Check whether vehicle moves in a straight line when steering
wheel is released.

Check whether steering wheel returns to neutral position when
steering wheel is released from a slightly turned (approx. 20°)
position.

If any abnormality is found, correct it by resetting adjusting
screw.

Checking and Adjusting Drive Belts (For power
steering)

Refer to MA section, “Checking Drive Belts”.

SMA898C

Checking Fluid Level

Check fluid level with dipstick on reservoir cap. Use “HOT” range
at fluid temperatures from 50 to 80°C (122 to 176°F). Use “COLD”
range at fluid temperatures from 0 to 30°C (32 to 86°F).

CAUTION:

Do not overfill.

Recommended fluid is Genuine Nissan PSF II or equiva-
lent.

IDX

ON-VEHICLE SERVICE

ST-7

SST836C

Checking Fluid Leakage

Check the lines for improper attachment and for leaks, cracks,
damage, loose connections, chafing or deterioration.
1.

Run engine at idle speed or 1,000 rpm.
Make sure temperature of fluid in oil tank rises to 60 to
80°C (140 to 176°F).

Turn steering wheel right-to-left several times.

Hold steering wheel at each “lock” position for five seconds
and carefully check for fluid leakage.

CAUTION:

Do not hold the steering wheel in a locked position for more
than 15 seconds.
4.

If fluid leakage at connectors is noticed, loosen flare nut and
then retighten.

Do not overtighten connector as this can damage O-ring,
washer and connector.
5.

If fluid leakage from power steering pump is noticed, check
power steering pump. Refer to ST-27.

Check rack boots for accumulation of power steering fluid.

Bleeding Hydraulic System

Raise front end of vehicle until wheels clear ground.

Add fluid into oil tank to specified level. Meanwhile, quickly turn
steering wheel fully to right and left and lightly touch steering
stoppers.
Repeat steering wheel operation until fluid level no longer
decreases.

Start engine.
Repeat step 2 above.

Incomplete air bleeding will cause the following to occur. When
this happens, bleed air again.

Generation of air bubbles in reservoir tank

Generation of clicking noise in oil pump

Excessive buzzing in oil pump

Fluid noise may occur in the valve or oil pump. This is common
when the vehicle is stationary or while turning the steering wheel
slowly. This does not affect performance or durability of the system.

ON-VEHICLE SERVICE

ST-8

SST491B

SST090B

Checking Steering Wheel Turning Force (For
power steering)

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

Start engine.

Bring power steering fluid up to adequate operating tempera-
ture. [Make sure temperature of fluid is approximately 60 to
80°C (140 to 176°F).]

Tires need to be inflated to normal pressure.
4.

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

Steering wheel turning force:

39 N (4 kg, 9 lb) or less

If steering wheel turning force is out of specification, check
rack sliding force.

Disconnect steering column lower joint and knuckle arms from
the gear.

Start and run engine at idle to make sure steering fluid has
reached normal operating temperature.

While pulling tie-rod slowly in the ±11.5 mm (±0.453 in) range
from the neutral position, make sure rack sliding force is within
specification.

Rack sliding force:

16 inch tire

235 - 294 N (24 - 30 kg, 53 - 66 lb)

17 inch tire

255 - 294 N (26 - 30 kg, 57 - 66 lb)

Check sliding force outside above range.

Rack sliding force:

Not more than 294 N (30 kg, 66 lb)

If rack sliding force is not within specification, overhaul steer-
ing gear assembly.

SST834-F

Checking Hydraulic System

Before starting, check belt tension, driving pulley and tire pressure.
1.

Set Tool. Open shut-off valve. Then bleed air. Refer to “Bleed-
ing Hydraulic System”, ST-8.

Run engine at idle speed or 1,000 rpm.

Make sure fluid temperature in reservoir tank rises to 60 to
80°C (140 to 176°F).

WARNING:

Warm up engine with shut-off valve fully opened. If engine is
started with shut-off valve closed, fluid pressure in the power
steering pump increases to maximum. This will raise fluid tem-
perature abnormally.
3.

Check pressure with steering wheel fully turned to left and right
positions with engine idling at 1,000 rpm.

CAUTION:

Do not hold the steering wheel in a locked position for more
than 15 seconds.

Power steering pump maximum operating pressure:

8,140 - 8,728 kPa (83 - 89 kg/cm

, 1,180 - 1,266

psi)

If pressure reaches maximum operating pressure, system is
OK.

IDX

ON-VEHICLE SERVICE

ST-9

If pressure increases above maximum operating pressure,
check power steering pump flow control valve. Refer to ST-27.

If power steering pressure is below the maximum operating
pressure, slowly close shut-off valve and check pressure
again.

CAUTION:

Do not close shut-off valve for more than 15 seconds.

If pressure increases to maximum operating pressure, gear is
damaged. Refer to “Removal and Installation”, ST-15.

If pressure remains below maximum operating pressure, pump
is damaged. Refer to “Disassembly”, ST-27.

After checking hydraulic system, remove Tool and add fluid as
necessary. Then completely bleed air out of system. Refer to
ST-8.

ON-VEHICLE SERVICE

Checking Hydraulic System (Cont’d)

ST-10

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