Subaru Legacy 2003 Service Manual page 3397

POWER ASSISTED SYSTEM (POWER STEERING)
C: INSPECTION
Check all disassembled parts for wear, damage or
other abnormalities. Repair or replace faulty parts
as required.
Part name Inspection
• O-ring fitting surface for
damage
Pipe
• Nut for damage
• Pipe for damage
• Clamps for weak clamping
Clamp
force
• Flared surface for damage
• Flare nut for damage
• Outer surface for cracks
Hose • Outer surface for wear
• Clip for damage
• End coupling or adapter for
degradation
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. It is very important to keep the hoses free from before mentioned fluids and to
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 area and/or 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.
So, avoid to keep this kind of condition when servicing as well as driving.
Trouble
Pressure hose burst
Forced out return hose
Fluid bleeding out of hose
slightly
Crack on hose
PIPE ASSEMBLY
Remedy
Replace with
new one.
Replace with
new one.
Replace with
new one.
Possible cause
Excessive holding time of relief status
Malfunction of relief valve
Poor cold characteristic of fluid
Poor connection
Poor holding of clip
Poor cold characteristic of fluid
Wrong layout, tensioned
Excessive play of engine due to deterioration of
engine mounting rubber
Improper stop position of pitching stopper
Excessive holding time of relief status
Excessive tightening torque for return hose clip
Power steering fluid, brake fluid, engine oil, electro-
lyte adhere on the hose surface
Too many times use in extremely cold weather
PS-76
Corrective action
Instruct customers.
Replace oil pump.
Replace fluid.
Correct.
Retighten.
Replace fluid.
Replace hose.
Replace defective parts.
Replace defective parts.
Replace.
Instruct customer.
Replace.
Replace.
Pay attention on service work.
Replace.
Instruct customers.