power steering pump pressure (1 Viewer)

[Mace]

as I mentioned, my fan uses the fluid pressure after the fluid leaves the gear box so it is in series with the follow and not "T"ed directly from the pump. I installed a gauge at the fan input (which is the same as gear box output) and pressure is about 200 PSI at idle and it pressure ranges from 25 PSI to 200 psi during low to high RPM changes . at 2500 RPM, the pressure goes back and fort between 200 and 25 every second or so like a pulse.

I am guessing that this pressure changes is caused by a spring loaded check valve at the pump so I am planning to remove the check valve and play with the spring to see what happens.

I am VERY surprised to hear it is 200 psi in the return line from the PS box. that seems super high to me. Most return lines (mine included) are held on with hose clamps. Something a 200 psi "spike" should easily blow apart considering I can pull them off with my bare hands.

Does your pressure change when you turn the wheel?

If you bump up the pressure coming out of the PS pump, you can blow out all of the seals in your PS box..

Do you ever notice your PS being hard to turn?

 

[Mace]

the fan is in series with power steering gear box outlet, meaning the outlet pipe from the power steering gear box goes in to inlet of the fan and the outlet of the fan returns back in to reservoir.

The lexus system is little different. the high pressure divides in two part. one directly runs to PS gear box and one with an electric check valve run the fan. when temp reaches the proper rating, the fan switch kicks in and allows high pressure to rurn the fan.

I may run the pump directly with PS pump just see what is happening this weekend and I will let you know how that turns up.

as I mentioned, my fan uses the fluid pressure after the fluid leaves the gear box so it is in series with the follow and not "T"ed directly from the pump.

I still want to see a pic of this system. Your statements contradict themselves a lot. You are either describing it horribly, don't have a clue how it is supposed to be hooked up, or have hooked it up wrong.

BTW, f it is supposed to only take the return psi from the PS gear box, if you hook it directly up to the pump, it will blow up.

 

[FJn00b]

you guys have a series of problem understanding a simple system

Here is one more time and how mine is set

[/URL]


on lexus, the red line (fan input) is Ted from pump so pump supplies high pressure to fan and box at the same time

 

[FJn00b]

I am VERY surprised to hear it is 200 psi in the return line from the PS box. that seems super high to me. Most return lines (mine included) are held on with hose clamps. Something a 200 psi "spike" should easily blow apart considering I can pull them off with my bare hands.

Does your pressure change when you turn the wheel?

If you bump up the pressure coming out of the PS pump, you can blow out all of the seals in your PS box..

Do you ever notice your PS being hard to turn?

yes hose clamp to reservoir that has no resistance but once you try to run it in to anything with resistance, it will blow the clamp off so technically you could have 10000 psi pressure from return to any circulating tank as long as nothing is in the middle.

 

[Marc311]

you guys have a series of problem understanding a simple system

I guess that makes us all even. You seem to have a "series" problem understanding simple manners.

I hope you get all the info you need before that vinegar and water attitude gets you banned.

 

[Mace]

you guys have a series of problem understanding a simple system

Here is one more time and how mine is set

[/URL]



on lexus, the red line (fan input) is Ted from pump so pump supplies high pressure to fan and box at the same time

The only thing I am having a hard time understanding is why you keep disagreeing with yourself and coming off as a Jerk to people that are trying to help you. I still want to see a pic. Unless there is some reason you do not want to show off your mad mechanical skills?

So if this is a lexus system, why would you not follow the stock design. 200 psi is woefully inadequate on the pressure side if it is designed to run 1000ish psi. If the fan is designed to run off of full pump PSI you will not get that from the other side of your PS box. Remember that the PS box does add assist by using PS pump pressure. Don't you think there is going to be at least a bit of parasitic loss??

Your own gauge said it only has 200 psi on the output from the box. go hook it up to the pressure side fo the box and see what happens.

yes hose clamp to reservoir that has no resistance but once you try to run it in to anything with resistance, it will blow the clamp off so technically you could have 10000 psi pressure from return to any circulating tank as long as nothing is in the middle.

Again do you not believe that the PS box will remove some of the pressure from the system? And maybe the cause of your issues???

25 psi to 200 psi?? To run a system that is designed (apparently) to run at 1000ish psi???