Question about 2005 Lexus LS400

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My 97 lexus sc300 started making whining sounds a few weeks ago .

I was losing power steering .about 20km later it had no power steering
i have changed the rack and pump and it still doesnt work .

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Keith Covington

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OK! Here is what you are going to have to do about your car.power steering problem. How do i know?? Trust me, my 1999 SC300 did the same thing last week. Remove the power steering pump from the car. Remove the PS resevoir and drain it of the old fluids. Then look very closely into the resevoir and look to see if there is what appears to be a small piece of screen in the bottom of it. this screen is attached to the inside of the resevoir to filter out any larger pieces of debris that may be introduced into the system. If you will notice, with the help of good flashlight ,check at the bottom of the resevoir you will see the pump feed hole. This screen/filter has been detached from it's mounting and has been sucked down into the pump feed hole. Remove the screen section that has broken loose and trash it. This screen is stopping up pump feed causing your power steering problems. Good luck bud!! Hope this helps out

Posted on Sep 17, 2012

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Anonymous

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Check to make sure there power streering fuild in da pump,and check hoses for leaks.

Posted on Jul 02, 2009

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2004 chevy Tahoe. hard to turn left. turn right is ok


steering rack or gear . 2X2 - 4X4 engine . Depends on steering system .
When you turn the steering wheel, the steering gear rotates the pitman arm which forces the relay rod to one side. The tie rods connect to the relay rod with the ball studs. The tie rods transfer the steering force to the wheels. Use the tie rods in toe adjustments. The tie rods are adjustable. The pitman arm support the relay rod. The idler arm pivots on a support attached to the frame rail and the ball stud attaches to the relay rod.
The 2 tie rod are threaded into the tube and secured with jam nuts. Right and left hand threads are used in order to permit the adjustment of toe.

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Power Steering System Description and Operation (w/o Electro-Hydraulic Steering)
The hydraulic power steering pump is a constant displacement vane-type pump that provides hydraulic pressure and flow for the power steering gear. The hydraulic power steering pumps are either belt-driven or direct-drive, cam-driven.
The power steering fluid reservoir holds the power steering fluid and may be integral with the power steering pump or remotely located. The following locations are typical locations for the remote reservoir:
• Mounted to the front of the dash panel
• Mounted to the inner fender
• Mounted to a bracket on the engine
The 2 basic types of power steering gears are listed below:
• A recirculating ball system
• A rack and pinion system
In the recirculating ball system, a worm gear converts steering wheel movement to movement of a sector shaft. A pitman arm attached to the bottom of the sector shaft actually moves one tie rod and an intermediate rod move the other tie rod.
In the rack and pinion system, the rack and the pinion are the 2 components that convert steering wheel rotation to lateral movement. The steering shaft is attached to the pinion in the steering gear. The pinion rotates with the steering wheel. Gear teeth on the pinion mesh with the gear teeth on the rack. The rotating pinion moves the rack from side to side. The lateral action of the rack pushes and pulls the tie rods in order to change the direction of the vehicle's front wheels.
The power steering pressure hose connects the power steering pump union fitting to the power steering gear and allows pressurized power steering fluid to flow from the pump to the gear.
The power steering return hose returns fluid from the power steering gear back to the power steering fluid reservoir. The power steering return line may contain an integral fin-type or line-type power steering fluid cooler.
In a typical power steering system, a pump generates hydraulic pressure, causing fluid to flow, via the pressure hose, to the steering gear valve assembly. The steering gear valve assembly regulates the incoming fluid to the right and left chambers in order to assist in right and left turns.
Turning the steering wheel activates the valve assembly, which applies greater fluid pressure and flow to 1 side of the steering gear piston, and lower pressure and flow to the other side of the piston. The pressure assists the movement of the gear piston. Tie rods transfer this force to the front wheels, which turn the vehicle right or left.


Your best bet , take it to a qualified repair shop.

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1 Answer

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