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Old 01-18-2019, 05:55 PM   #1 (permalink)
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PSC Pump and Borgeson Box Whine

I have a 4,000mi PSC Type II pump that I cannot seem to get the whine out of. It's not quite in a 4x4 but you all know steering systems much better than anyone else I know to reach out to. I've put up with the whine for awhile, the last two people that rode in my car both commented on it.

Problem: I get a low whine out of the pump with any steering input, hot, cold, whatever. It does not make any noise with just rpm, adding steering load creates the whine.

Attempts to fix:
  1. Bleed, bleed, bleed - No improvement. Same whine for 4,000mi
  2. Installed a cooler to ensure temps stay resonable

System:
  • This P/S Pump
  • Borgeson Steering Box [5,000mi on it]
  • AC Delco Brand P/S Fluid

Should I consider using the super-fancy Swepco fluid?

Any and all ideas are welcome.



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Old 01-19-2019, 09:18 AM   #2 (permalink)
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I had a low whine in my PSC hydro assist setup (1600psi pump, 1.75" ram), and I was using the Swepco fluid they recommended.

Some friends of mine who do competition wheeling/racing suggested the Amsoil hydraulic fluid. Cured the whine and the overflow problem I was having, great stuff!
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Old 01-19-2019, 03:51 PM   #3 (permalink)
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Thanks for the feedback. About all I can think of doing is to put a catch can on the reservoir lid and try to force a higher fluid level. Or change the fluid.
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Old 01-20-2019, 07:11 PM   #4 (permalink)
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Any other suggestions? I think I'm fluid shopping, hoping something else will fix it.

Currently running AC Delco 10-5073 fluid
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Old 01-20-2019, 08:55 PM   #5 (permalink)
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how long are your lines , how big is cooler ? You may need more reservoir capacity.

The Royal Purple synthetic is good fluid to.

What are you turning, tire size ? hows the scrub radius and steering set up ? whats the vehicle weight ?

where is the pump mounted ? is it above steering box ?

What is the ratio of the steering box ? it may be line size related.
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Old 01-21-2019, 05:55 AM   #6 (permalink)
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Quote:
Originally Posted by peesalot View Post
how long are your lines , how big is cooler ? You may need more reservoir capacity.

The Royal Purple synthetic is good fluid to.

What are you turning, tire size ? hows the scrub radius and steering set up ? whats the vehicle weight ?

where is the pump mounted ? is it above steering box ?

What is the ratio of the steering box ? it may be line size related.


My setup is on a car, 1972 ‘Cuda with a 5.7L Hemi swap.

The lines are pretty short, about 1.5’ to the pump, 3’ to and from the cooler, all 6AN.

The cooler is a 8”x12” stacked plate.

Tires and scrub shouldn’t be an issue. 255/45 tired Nitto 555s

Pump is fairly high on the motor and is above the box with an integral reservoir. The cold fluid level is slightly below my pressure line, however I’ve noticed factory systems be like this as well.

The steering box is 14:1, I don’t believe PSC sells these pumps with larger outputs than 6AN.

Fluid level shown as red line








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Old 01-22-2019, 08:42 AM   #7 (permalink)
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Quote:
Originally Posted by goodysgotacuda View Post

The cooler is a 8”x12” stacked plate.

alk
I have never had good flow out of a stacked plate cooler for a power steering system, I'd just bypass that cooler and see if your whine goes away.
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Old 01-22-2019, 04:58 PM   #8 (permalink)
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Sounds like its cavitating, change to synthetic and see.
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Old 01-22-2019, 05:15 PM   #9 (permalink)
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Try tighten the drive belt or spray some dressing? The wrap around the pulley seem to be lacking.
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Old 01-22-2019, 06:02 PM   #10 (permalink)
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Quote:
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I have never had good flow out of a stacked plate cooler for a power steering system, I'd just bypass that cooler and see if your whine goes away.
Fair point, I will have someone run the steering wheel with the cap off. It should be pretty obvious if the return isn't keeping up. Thanks!


Quote:
Originally Posted by peesalot View Post
Sounds like its cavitating, change to synthetic and see.
Which fluids are considered "synthetic", I am not the most savvy when it comes to hydraulic fluids.

Quote:
Originally Posted by TrailTamer XJ View Post
Try tighten the drive belt or spray some dressing? The wrap around the pulley seem to be lacking.

Thanks, I marked the belt and pulley and do not seem to be having any slippage issues at this time.
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Old 01-22-2019, 09:02 PM   #11 (permalink)
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Many companies make a synthetic, Amsoil & Royal Purple have worked great for us.

I believe they are not petroleum based.
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Old 01-23-2019, 08:17 AM   #12 (permalink)
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Thanks. I’ll look into it.

I initially started with generic ps fluid and converted to the AC Delco. During that the fluid made a nasty brown mixture for quite some time.

I’ll have to see about flushing the Delco clean then adding the Royal Purple.


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Old 01-23-2019, 09:19 AM   #13 (permalink)
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Had a similar issue... NO LEAKS but a whine when turning. Ended up being a slight air leak on the input side of the pump.

Good LUCK
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Old 01-23-2019, 10:21 AM   #14 (permalink)
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As one person I saw already said, likely cavitation.

This happens when the pressure differential between the inlet of the pump and the outlet of the pump is too large. This means either too much back pressure, or not enough inlet pressure.

Making sure the fluid level is high, there is no blockage from the reservoir to the inlet, no leaks on the lower pressure side, no restrictions (coolers that wind back and fourth across aluminum fins are BAD, you need a straight through cooler).

Your reservoir needs to be the highest point in the system and the path back to it from the RAM / gearbox needs to all be uphill or else it wont bleed well.
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