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it indicates that when the pump gears are placed under pressure /load that they are interfering with the pump housing or are not being held in the correct mesh situation
the situation of powers steering that when in the relaxed position ( no steering wheel movement) the valves are so placed that the oil is by passed straight back to the reservoir but any movement of the wheel closes those valves and diverts the oil to the cylinder/actuator and so power assists the steering
AT this point is when load is applied to the pump and the noise is heard
I would suggest that the pump be removed and inspected for wear on the idler gear shaft, wear on the tips of the teeth from contact with the housing
Mostly the best fix is a replacement pump because it the clearance between the teeth and the housing is excessive or scored then the full pressure will not be achieved
Depends on what the noise sounds like. Some noise can be normal if you are holding the steering wheel at full lock . That is the pressure from the pump pushing hydraulic fluid through the steering box. If it is usually loud at the slightest turn..could be bad steering pump , leaking hose, leaking seal at steering box, even a bad belt.
nil to very low until you turn the steering wheel. At this point the valves close and the pressure can go up to 2000psi until wheel movement stops and then it drops to original reading as the valves close off and allow the pumped oil to by-pass back to the reservoir.
There is a pressure relief valve to prevent the pump locking up and destroying itself. You will hear it working when you hold the steering hard on full lock. Otherwise the fluid is recycled back to the reservoir through the valves until you turn the wheel and that upsets the valves which close off until the wheel movement stops and no fluid is let in or released until the wheel is again moved.
There is a pressure relief valve in the pump that allows excessive pressure to bleed out and so not lock up the pump. This is spring loaded so I would be checking the spring tension as the noise may be the valve vibrating from repeated unloading of the pressure more rapidly than it should . It will go when the steering is being turned but will reappear when the wheel movement is stopped . As power steering pumps are the same as sump pumps ( 2 spur gears in a case ) they are mostly un repairable as when the case is worn there is excessive clearance between the teeth and the body and the teeth of the gears will have excessive back lash . As one gear is on a shaft and the other gear is driving from the pulley any misalignment will cause problems as the gears will tend to be out of mesh. It is always best to replace a pump with a new item and not reconditioned as they are seldom repaired correctly.
normally, the only part of your automatic transmission that will make a whining noise is the pump. it usually whines when iether the fluid is low or more commonly when the transmission oil filter is getting plugged up.
the power steering pump will also make a whining noise too.
turn the wheel all the way to the right and hold steady pressure against the stop. this puts maximum force on the power steering pump and, if the power steering pump is the one making the whine, it will change the sound of it. (usually louder).
if the trans pump is making the whine noise, it should sound different in neutral compared to drive. this test will really only work if it make the noise without the vehicle moving. if it wont do it at idle hold the rpms at 2000 or so.
if you decide the noise is coming from the transmission, and the transmission filter has not been replaced (assuming you installed a used transmission), replace the filter by removing the oil pan.
oh and also, if it is the power steering pump you should be able to make it make the whining noise while the vehicle is stationary. if it wont make noise unless its moving its not the power steering pump.
the power steering only turns good when your accelerating then the pump is bad .it will not build pressure unless the pump runs faster ,replace the pump its about $300 installed at a shop.please rank this thanks.
lift the vehichle to check for wheel bearing play apply pressure to the top and bottom of the tire in a rocking motion. any movement indicates bad wheel bearings or ball joints. watch for where the movement is