Subaru Legacy (2005 year). Manual - part 852

PS-79

POWER ASSISTED SYSTEM (POWER STEERING)

Pipe Assembly [RHD Model]

C: INSPECTION

Check all disassembled parts for wear, damage or other abnormalities. Repair or replace the defective parts
as necessary.

CAUTION:
Although surface layer materials of rubber hoses have excellent weathering resistance, heat resis-
tance and resistance for low temperature brittleness, they are likely to be damaged chemically by 
brake fluid, battery electrolyte, engine oil and automatic transmission fluid and their service lives are 
to be very shortened. Wipe out immediately when the hoses are adhered with the fluids.
Since resistances for heat or low temperature brittleness are gradually declining according to time
accumulation of hot or cold conditions for the hoses and their service lives are shortening accord-
ingly, it is necessary to perform careful inspection frequently when the vehicle is used in hot weather
areas, cold weather areas and a driving condition in which many steering operations are required in
short time.
Particularly continuous work of relief valve over 5 seconds causes to reduce service lives of the hos-
es, the oil pump, the fluid, etc. due to over heat.

Parts

Maintenance Parts

Corrective action

Pipe

• O-ring fitting surface for damage
• Nut for damage
• Pipe for damage

Replace with a new one.

Clamp

• Clamps for weak clamping force

Replace with a new one.

Hose

• Flare surface for damage
• Flare nut for damage
• Outer surface for cracks
• Outer surface for wear
• Clip for damage
• End coupling or adapter for deformation

Replace with a new one.

Trouble

Possible cause

Corrective action

Pressure hose burst

Excessive holding time of relief status

Instruct customers.

Malfunction of relief valve

Replace the oil pump.

Poor cold characteristic of fluid

Replace fluid.

Forced out return hose

Poor connection

Repair.

Poor holding of clip

Retighten.

Poor cold characteristic of fluid

Replace fluid.

Fluid bleeding out of hose 
slightly

Wrong layout, tensioned

Replace the hose.

Excessive play of engine due to deterioration of 
engine mounting rubber

Replace the parts if defective.

Improper stop position of pitching stopper

Replace the parts if defective.

Crack on hose

Excessive holding time of relief status

Replace.
Instruct customers.

Excessive tightening torque for return hose clip

Replace.

Power steering fluid, engine oil, electrolyte adhere 
on the hose surface

Replace.
Pay attention on service work.

Too many times use in extremely cold weather

Replace.
Instruct customers.

PS-80

POWER ASSISTED SYSTEM (POWER STEERING)

Pipe Assembly [RHD Model]

NOTE:
It is likely that although one judges fluid leakage, there is actually no leakage. This is because the fluid spilt
during the last maintenance was not completely wiped off. Be sure to wipe off spilt fluid thoroughly after main-
tenance.

(A)

H6 model

(B)

H4 turbo model

(C)

H4 non-turbo model

Fluid leaking area

Possible cause

Corrective action

Leakage from connecting portions of 
pipes and hoses, numbered with (1) 
through (10) in the figure

Insufficient tightening of flare nut, adhesion of 
dirt, damage to flare or flare nut or eye bolt

Loosen and retighten. Replace if ineffec-
tive.

Poor insertion of hose or clamping

Retighten or replace the clamp.

Damaged O-ring or gasket

Replace O-ring or gasket pipe or hose 
with new one, if ineffective, replace the 
gearbox also.

Leakage from hose (11), (12) and 
(13) in the figure

Crack or damage in hose

Replace with a new one.

Crack or damage in hose hardware

Replace with a new one.

Leakage from surrounding of cast iron 
portion of oil pump (14) and (15) in 
the figure

Damaged O-ring

Replace the oil pump.

Damaged gasket

Replace the oil pump.

Leakage from oil tank (16) and (17) in 
the figure

Crack in oil tank

Replace the oil tank.

Leakage from filler neck (18)

Damaged cap packing

Replace the cap.

Crack in root of filler neck

Replace the oil tank.

High fluid level

Adjust the fluid level.

Leakage from surrounding of power 
cylinder of gearbox (19) in the figure

Damaged oil seal

Replace the oil seal.

Leakage from control valve of gear-
box (20) and (21) in the figure

Damaged packing or oil seal

Replace the problem parts.

Damage in control valve

Replace the control valve.

(22) Leakage from the joints between 
cooler pipe and hose.

Insufficient tightening of connecting portion.

Loosen and retighten.

PS-00698

(5)

(21)

(19)

(9)

(14)

(15)

(10)

(11)

(16)

(18)

(17)

(12)

(13)

(7)

(8)

(20)

(4)

(3)

(6)

(1)

(2)

(22)

(A)

(B)

(C)

(16)

(18)

(17)

(12)

PS-81

POWER ASSISTED SYSTEM (POWER STEERING)

Oil Pump

9. Oil Pump

A: REMOVAL

1. H4 MODEL

1) Disconnect the ground cable from battery.
2) Remove the air intake duct. <Ref. to
IN(H4DOTC)-9, REMOVAL, Air Intake Duct.>
<Ref. to IN(H4SO 2.0)-8, REMOVAL, Air Intake
Duct.>
3) Remove the pulley belt cover.
4) Loosen the belt tension securing bolt and gener-
ator securing bolt, and then remove the power
steering pump V-belt.

5) Disconnect the connector from power steering
pump switch.
6) Disconnect the pressure hose and suction hose
from oil pump.

CAUTION:
• Do not allow fluid to come into contact with
pulley belt.
• To prevent foreign matter from entering the
hose and pipe, cover the open ends with a
clean cloth.
• Non-turbo model

• Turbo model

7) Remove the bolts which hold the power steering
pump bracket.

8) Place the oil pump bracket in a vise, and remove
the two bolts from the front side of oil pump.

CAUTION:
When securing the oil pump bracket in a vise, 
hold the oil pump bracket with the least possi-
ble force between two wood pieces.

9) Remove the bolt from the rear side of oil pump.

(1) Suction hose

(2) Pressure hose

PS-00461

PS-00688

(1)

(2)

(1) Suction hose

(2) Pressure hose

(2)

PS-00459

(1)

PS-00188

PS-00128

PS-82

POWER ASSISTED SYSTEM (POWER STEERING)

Oil Pump

10) Disassemble the oil pump and bracket by in-
serting a flat tip screwdriver as shown in the figure.

2. H6 MODEL

1) Disconnect the ground cable from battery.
2) Remove the cover of pully belt.
3) Remove the V-belt.
4) Remove the power steering pressure switch
connector.
5) Remove the tensioner adjuster.
6) Disconnect the pressure hose and suction hose
from the oil pump.

CAUTION:
• Do not allow fluid to flow from the hose end
and to contact pully belt.
• To prevent entering foreign matter into hose,
cover the hose opening with clean cloth.

7) Remove the bolts which install power steering
pump bracket.

8) Place the oil pump bracket in a vise, and remove
the two bolts from the front side of oil pump.

CAUTION:
When securing the oil pump bracket in a vise, 
hold the oil pump bracket with the least possi-
ble force between two wood pieces.

9) Remove the bolt from back side of oil pump.

10) Remove the oil pump from bracket.

(1) Suction hose

(2) Pressure hose

PS-00129

PS-00700

(1)

(2)

PS-00701

PS-00229

PS-00702