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Old 11-01-2010, 07:50 PM   eBay Motors  #1 (permalink)
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hydroboost leaking

hey guys, I have a leak that I think is coming from the hydroboost. master and hydroboost are oily and inside the wheel well on the drivers side is also oily. Is the hydro a common problem on these trucks? Do i just need to replace it or is there any parts to fix them? also ive noticed lately that when Im turning the wheel quickly the p.s. pump whines like it is low on fluid. I did a H.B. flush recently hoping that would help the prob but it didnt. I guess im leaning toward the HB, just looking for anyone who has had a similar problem before i go replacing parts! Thanks!
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That's what I had...untill the block heater caught fire and burned her down!
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Old 11-01-2010, 10:05 PM   eBay Motors  #2 (permalink)
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Please post back if you solve your whining issue. It sounds like your flow control valve needs a spring shim. Whining usually comes from resonance stemming from pressure bypass. Increase the pressure with a spring mod, and the whining should stop.

Is it the same kind of whine you hear at the steering limit?
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Old 11-03-2010, 03:02 PM   eBay Motors  #3 (permalink)
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I dont really have much of a whine at the steering limit...mine sounds like when you do the HB flush on your last turn of the wheel when you first start to get low on fluid. dont really know how else to describe it.
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2004.5 LLY Extended cab 4x4 2500HD
4" Turbo Back Exhaust
PPE Standard------------->melted
KB Modded mouthpiece---->melted
Hook'em modded air box--->melted

That's what I had...untill the block heater caught fire and burned her down!
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Old 11-03-2010, 03:23 PM   eBay Motors  #4 (permalink)
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Itís whining because you have a leak and itís low on fluid in the pump reservoir. Flushing regularly will extend the life, you may have waited too long to start. The unit swap only takes about 30 minutes total and itís easy to do.

The GM part number is 15854059 for a new one.
Quote:
GMpartsdirect.comís price:
GM PART # 15854059
CATEGORY: All
PACK QTY: 1
CORE CHARGE: $0.00
GM LIST: $598.90
OUR PRICE: $305.44
Remans can be had for cheaper, but Iíve never tried those.
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Use-ta Haves 2006-6.0 3500 WT DRW ExCab Flatbed, 2005-LLY 3500 LS DRW Crew Cab, 2002-LB7 3500 LS DRW Crew Cab
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Old 11-03-2010, 03:24 PM   eBay Motors  #5 (permalink)
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KB, where do I get a spring shim? Also, I checked the steering limit and could hear the slight whine that you mentioned...not the same whine that I have. Dont know If the pump could be going bad also? First thing Im trying to fix is my fluid leak near the the HB...havnt pinpointed it yet.

Thanks!
__________________
2004.5 LLY Extended cab 4x4 2500HD
4" Turbo Back Exhaust
PPE Standard------------->melted
KB Modded mouthpiece---->melted
Hook'em modded air box--->melted

That's what I had...untill the block heater caught fire and burned her down!
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Old 11-03-2010, 03:30 PM   eBay Motors  #6 (permalink)
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Hook'em, It actually kept doing it even after my last hb flush when it was topped off...I thought the flush would take care of it but no luck. wondering if the pump is getting weak or if the shim would help it out?? BTW...how bout that Iowa State football team!?? Sorry!, not very often I get to say that about ISU!!
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2004.5 LLY Extended cab 4x4 2500HD
4" Turbo Back Exhaust
PPE Standard------------->melted
KB Modded mouthpiece---->melted
Hook'em modded air box--->melted

That's what I had...untill the block heater caught fire and burned her down!
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Old 11-03-2010, 04:04 PM   eBay Motors  #7 (permalink)
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1st thing is to correct the HB prob. If it's leaking where it joins the Master, the seals on the rod are worn and leaking by...you have to replace the unit. When you do, most likely everything else will behave and run normal again.

Football? What's that?
At least we're better than the Cowboys (and I don't mean OSU).
__________________
2007 LBZ 3500 LT3 DRW Crew Cab, Sulastics, Putnam XDR 15K, B&W 30K-Turnover GN+Companion, Ride-Rite Air...EFI'd by Rob
2008 LMM 3500WT DRW Crew Cab, 8 'Flat/GN, Workforce Alum Toolbox, Ride-Rite Air, Sulastics
Use-ta Haves 2006-6.0 3500 WT DRW ExCab Flatbed, 2005-LLY 3500 LS DRW Crew Cab, 2002-LB7 3500 LS DRW Crew Cab
I Live my life in such a way that when my feet hit the floor in the morning...Satan shudders & says "Oh shit, he's awake!"


Last edited by Hook'em_Horns!; 11-03-2010 at 04:07 PM.
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Old 11-03-2010, 04:31 PM   eBay Motors  #8 (permalink)
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while you are working on the hb make sure your pressure lines aren't leaking. I just replaced both of my lines, i had the same problem with trying to find a leak, turns out the lines were only half the problem. hb is next.
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