POWER ASSISTED SYSTEM (POWER STEERING) > Pipe Assembly [RHD Model]

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

Part	Inspection	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.

CAUTION:

Although the surface layer materials of rubber hoses have excellent weathering resistance, heat resistance and resistance for low temperature brittleness, they will be damaged chemically by brake fluid, battery electrolyte, engine oil and automatic transmission fluid and their service lives will be very shortened. Wipe off hoses immediately if any of these come into contact with the hoses.

Since resistances for heat and low temperature brittleness gradually declines according to long periods of exposure to hot or cold conditions, and their service lives are shortening accordingly. It is necessary to perform careful inspection frequently when the vehicle is used in hot weather areas, cold weather areas and in frequent driving conditions where a lot of steering work is required.

Particularly when there is continuous operation of the relief valve for 5 seconds or more, the life of the hoses, oil pump, and fluid will be shortened due to overheating.

Malfunction	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	Correct
	Loosening of the clip	Retighten
	Poor cold characteristic of fluid	Replace fluid.
Fluid slightly leaking out of hose	Wrong piping layout and tension	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, brake fluid, engine oil, or electrolyte coming into contact with the hose surface	• Replace • Be careful during service work.
	Too many uses in extremely cold weather	• Replace • Instruct customers.

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 the connections of pipes and hoses, numbered (1) through (10) in the figure	Insufficient tightening of flare nuts, dirt accumulation, damage to flare or flare nut or eye bolt	Loosen and retighten. Replace if ineffective.
	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 parts, and if there is still no improvement, replace the gearbox.
Leakage from hose (11), (12) and (13) in the figure	Crack or damage in hose	Replace with a new part.
Leakage from hose (11), (12) and (13) in the figure	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 reservoir (16) and (17) in the figure	Crack in the reservoir tank	Replace the reservoir tank.
Leakage from filler neck of (18)	Damaged cap gasket	Replace the cap.
	Crack in root of filler neck	Replace the reservoir tank.
	Fluid level too high	Adjust the fluid level.
Leakage from power cylinder of gearbox 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.