Subaru Legacy IV (2008 year). Service manual — part 970
PS-42
Pipe Assembly
POWER ASSISTED SYSTEM (POWER STEERING)
C: INSPECTION
Check all disassembled parts for wear, damage or other problems. Repair or replace the defective parts as
necessary.
CAUTION:
Although the surface layer materials of rubber hoses have excellent weathering resistance, heat re-
sistance 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 off hoses immediately if any of these come into contact with the hoses.
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.
Continuous discharge of the relief valve for 5 seconds or more will reduce the service lives of hoses,
oil pump, fluid, etc., due to over heating.
Part
Maintenance parts
Corrective action
Pipe
• O-ring fitting surface damage
• Nut damage
• Pipe damage
Replace with a new part.
Clamp
• Loose clamps
Replace with a new part.
Hose
• Flare surface damage
• Flare nut damage
• Outer surface cracks
• Outer surface wear
• Clip damage
• End coupling or adapter deformation
Replace with a new part.
Trouble
Possible cause
Corrective action
Pressure hose burst
Excessive holding time of relief status
Instruct customers.
Malfunction of the relief valve
Replace the oil pump.
Poor cold characteristic of fluid
Replace fluid.
Disconnection of the return
hose
Improper connection
Repair.
Loosening of the clip
Retighten.
Poor cold characteristic of fluid
Replace fluid.
Fluid slightly leaking out of
hose
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.
Be careful during service work.
Too many uses in extremely cold weather
Replace.
Instruct customers.
PS-43
Pipe Assembly
POWER ASSISTED SYSTEM (POWER STEERING)
NOTE:
There are conditions in which a fluid leak is diagnosed, but is not actually leaking. This is because the fluid
spilt during the last maintenance was not completely wiped off. Be sure to wipe off spilt fluid thoroughly after
maintenance.
Fluid leaking area
Possible cause
Corrective action
Leakage from pipe and hose connec-
tions numbered with (1) through (8) 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.
Improper installation of hose or clamp
Retighten or replace the clamp.
Damaged O-ring or gasket
Replace the O-ring, gasket pipe or hose
with new part, if still no improvement,
replace the gearbox as well.
Leakage from hose (9) through (13) in
the figure
Crack or damage in hose
Replace with a new part.
Crack or damage in hose hardware
Replace with a new part.
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 of (18)
Damaged cap gasket
Replace the cap.
Crack in root of filler neck
Replace the oil tank.
Fluid level too high
Adjust the fluid level.
Leakage from power cylinder of gear-
box area (19) in the figure
Damaged oil seal
Replace the oil seal.
Leakage from (20), (21) in the figure
and control valve of gearbox
Damaged gasket or oil seal
Replace the problem parts.
Damage in control valve
Replace the control valve.
(10)
(17)
(1)
(13)
(19)
(4)
(2)
(9)
(8)
(7)
(12)
(15)
(14)
(11)
(16)
(18)
(5)
(6)
(20)
(3)
(21)
PS-00805
PS-44
Oil Pump
POWER ASSISTED SYSTEM (POWER STEERING)
7. Oil Pump
A: REMOVAL
1. H4 MODEL
1) Disconnect the ground cable from the battery.
2) Remove the air intake duct. <Ref. to
IN(H4DOTC)-9, REMOVAL, Air Intake Duct.>
<Ref. to IN(H4SO)-8, REMOVAL, Air Intake Duct.>
3) Remove the pulley belt cover.
4) Loosen the belt tension securing bolt and gener-
ator securing bolt, then remove the power steering
pump V-belt.
5) Disconnect the connector from the power steer-
ing pressure switch.
6) Disconnect the pressure hose and suction hose
from the oil pump.
CAUTION:
• Do not allow fluid to come into contact with
the pulley belt.
• To prevent foreign matter from entering the
hose and pipe, cover the open ends with clean
cloth.
• Non-turbo model
• Turbo model
7) Remove the installation bolt of the power steer-
ing pump bracket.
8) Place the oil pump bracket in a vise, and remove
the two bolts from the front side of the 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 pieces of wood.
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-45
Oil Pump
POWER ASSISTED SYSTEM (POWER STEERING)
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 the battery.
2) Remove the cover of the pulley belt.
3) Remove the V-belts.
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 contact the pulley belt.
• To prevent foreign objects from entering the
hose, cover the hose openings with a clean
cloth.
7) Remove the bolts which holds the power steer-
ing pump bracket.
8) Place the oil pump bracket in a vise, and remove
the two bolts from the front side of the oil pump.
CAUTION:
When securing the oil pump bracket in a vice,
hold the oil pump bracket with the least possi-
ble force between two pieces of wood.
9) Remove the bolt from the back side of the oil
pump.
10) Remove the oil pump from the bracket.
(1) Suction hose
(2) Pressure hose
PS-00129
PS-00700
(1)
(2)
PS-00701
PS-00229
PS-00702
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