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Old 06-28-2018, 09:13 PM   #1 (permalink)
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Full hydro pump noise

I have a psc double ended ram, Eaton valve, and a new Saginaw pump. Pump started whining last trip. First replaced the filter, topped off and bled system. No difference. Pump had allot of end play so I replaced it, topped off and bled system. Still whines.

All I can think is it's drawing air in somewhere. Can't find any leaks. Not sure where to go from here.

Any pointers?
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Old 06-28-2018, 09:53 PM   #2 (permalink)
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foamy fluid?
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Old 06-28-2018, 10:03 PM   #3 (permalink)
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foamy fluid?
I wouldn't say foamy. But there are some tiny bubbles in the fluid. The surface is free of foam.
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Old 06-29-2018, 07:41 AM   #4 (permalink)
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So its a new pump then? Still has air in tbe system and thats causing the noise and bubbles.

I had small bubbles after following PSC's step by step how to bleed the system 2X. Drove me nuts, did it again and bubbles dissappeared... easy to have a little air trapped in the system...
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Old 06-29-2018, 08:26 AM   #5 (permalink)
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So its a new pump then? Still has air in tbe system and thats causing the noise and bubbles.

I had small bubbles after following PSC's step by step how to bleed the system 2X. Drove me nuts, did it again and bubbles dissappeared... easy to have a little air trapped in the system...
Yes, new reman pump. But the old one whined too. Done the psc bleed procedure several times. Lock to lock, wait, lock to lock, wait. Probably a dozen times.
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Old 06-29-2018, 08:36 AM   #6 (permalink)
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How big of a ram are you running and what's your axle/wheel/tire/scrub radius setup?
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Old 06-29-2018, 08:43 AM   #7 (permalink)
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How big of a ram are you running and what's your axle/wheel/tire/scrub radius setup?
2x8psc DE. king pin 60. Centered h1s. 42 inch pitbulls. The funny thing is, it worked flawlessly for the last year.

Edit: it's a 2.5x8 ram

Last edited by banjobend; 06-29-2018 at 09:37 AM.
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Old 06-29-2018, 08:48 AM   #8 (permalink)
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2x8psc DE. king pin 60. Centered h1s. 42 inch pitbulls. The funny thing is, it worked flawlessly for the last year.
I had this same scenario with my TJ. May not be your problem but it is worth looking into.

PSC system. So all the pieces came from PSC. I had my pump off and back to them multiple times before I got really pissed off sitting at the trail head in Arizona. The next week I took all the stuff off and sent it back. Tom called and asked what I was doing. I was running a 2.5" ram with really wide everything and he stated that my pump was having to work at its maximum capacity at all times just to function. So I kept burning them up.

Swapped to a 2.75" ram and haven't had an issue since.
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Old 06-29-2018, 10:21 PM   #9 (permalink)
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Billavista hydro steering bible gives some information on whining.
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Old 06-30-2018, 06:11 AM   #10 (permalink)
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Is the whine constant? Just at high RPM? Just at full lock? Or maybe just at idle?

The pump pulling too much suction due to restrictions in the supply line will cause the same cavitation problem as sucking in air.
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Old 07-03-2018, 05:06 PM   #11 (permalink)
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Is the whine constant? Just at high RPM? Just at full lock? Or maybe just at idle?

The pump pulling too much suction due to restrictions in the supply line will cause the same cavitation problem as sucking in air.
Only when under load and above idle. I bypassed the filter and cooler to help narrow it down. Currently have an 8 inch return from the valve to the pump, no kinks or restrictions. Still whines.

Anyone have a way to troubleshoot an Eaton steering valve?

Last edited by banjobend; 07-03-2018 at 05:07 PM.
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Old 07-04-2018, 05:01 PM   #12 (permalink)
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Also, I'm running an inline fluid filter. I believe it's for tranny fluid. Would that make to much resistance?
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Old 07-04-2018, 08:32 PM   #13 (permalink)
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get a pressure gauge it will tell you a lot.

ive also heard of hydro boost guys having issues getting the proper pump because they lump
all of the hydro and non hydro pumps under one pn. so its hit and miss if you get a pump that flows and builds enough pressure.

as i get older buying a complete system from howe or psc doesnt seem so expensive once i factor in my time chasing issues cause by parts not being deaigned to work together.
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Last edited by mobil1syn; 07-04-2018 at 08:38 PM.
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