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  1. #11
    Veteran Member
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    Dec 2009
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    2,434
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    gilmer tx
    Tractor
    yanmar 2002d

    Default Re: Hydraulic pump whine after valve installation?

    According to 284 International it is 7cc per revolution meaning 4.8GPM @2600rpm. I believe that is what is on the pump on his 186 and those numbers agree with the factory brochure for the 186. I'm certainly no hydraulic guru and I don't know what your problem is but I don't think hose size is your problem.

  2. #12
    Bronze Member
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    Jul 2011
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    Otis Orchards, WA

    Default Re: Hydraulic pump whine after valve installation?

    I was looking at the factory snowblower manual last night and noticed that all of the factory hoses use pipe ends. That got me thinking.

    I spoke with the hydraulic shop this morning and they confirmed that pipe fittings definately have a larger ID than the JIC swivel ends they used on the current hoses. I measured the straight swivel end for ID and it's only .250" so I believe these fitting are my restriction point.

    I'll update as things are changed.
    In the stable...

    Yanmar 186D, Turfs, Folding ROPS, YCM-60 MMM, YSS-48 Snow Blower
    Hinomoto E2302 (being restored), ROPS, Turned Up Pump, Honed Injectors, Modified JD Turfs, 72" Maschio Finish Mower
    Sakai SW-25 Double Drum Vibratory Roller
    Kubota K008-3 Micro Excavator

    How I pay for 'em - Glacier Diesel Power, Inc.

  3. #13
    Super Member kenmac's Avatar
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    Feb 2005
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    5,480
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    The Heart of Dixie
    Tractor
    yanmar 3110D

    Default Re: Hydraulic pump whine after valve installation?

    don't know if this helps or makes any difference in your case. My lines on my loader valve are 1/2 '' . the fittings (JIC). have a smaller ID than the hoses.I have no whine out of my pump
    Yanmar 3110D
    07 Dodge 2500 5.9 Cummins
    Husky 372xp
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    Maruyama trimmer
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    16' Tow Master Dump Trailer ,20' Yanmar Hauler

  4. #14
    Super Member California's Avatar
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    Jan 2004
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    5,400
    Location
    Sonoma County
    Tractor
    Yanmar YM240, YM186D, and another YM186D

    Default Re: Hydraulic pump whine after valve installation?

    I doubt those quarter-inch openings through the fittings are the problem.

    Could the return lines be sucking air at some point?

  5. #15
    Elite Member Car Doc's Avatar
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    Mar 2009
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    3,246
    Location
    Kansas
    Tractor
    YM3810D Yanmar

    Default Re: Hydraulic pump whine after valve installation?

    I am running 1/2 jic fittings also no problems other than maybe speed but my power is there and no noise either.

    I think he hit it on the head earlier when he re-cleaned the screen and it got better thats my thinking is to follow that path again the pump is apparently sucking air or is starved for fluid. hth
    Yanmar YM3810D, LT duty 3pt hoe, 6' KK2 tiller, 6' KK box blade, 6 1/2' KK disc, 5' Howse bush hog, 5' Howse back blade, 9" Yellow PHD, 3 Husky chain saws 346XP NE, 359, 372XP. 07 HD Heritage Softail, Crack injectors, check compression, take 2 beers and call me. "Hey you didn't build that."

  6. #16
    Super Member California's Avatar
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    Jan 2004
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    Sonoma County
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    Yanmar YM240, YM186D, and another YM186D

    Default Re: Hydraulic pump whine after valve installation?

    Agree, starved.

    I wonder if there is still debris somewhere in a return line or even in the loader valve. Maybe blowing them out with air (messy!) would clear them?

  7. #17
    Bronze Member
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    Jul 2011
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    Otis Orchards, WA

    Default Re: Hydraulic pump whine after valve installation?

    Well, I'm at a real loss here. The whine was eliminated by going to 1/2" on the feed, return, and PBY lines as noted earlier.

    The 3-point works perfectly and the power shift is fine. The system is quiet and smooth when you dead head the pump to check pressure at the valve. All is well as long as fluid isn't flowing thru the work ports via applying the control lever.

    I've checked the strainer again. No debris. Changed the filter again, no change.

    I looped the work ports to take the cylinders/load out of the equation. When the control valve is actuated you can see and feel the line with flow jumping and vibrating. You can also feel light hammering in the hard pressure line from the pump to the divider block. It really feels like air in the system but I have no idea how that could be and the fluid doesn't show signs of air bubbles. It almost feels like pressure chattering over a relief valve but when I dead head to a pressure gauge it's shows steady at 2000 psi.

    I've done a fair share of hydraulic valve installs but this one has me baffled.
    In the stable...

    Yanmar 186D, Turfs, Folding ROPS, YCM-60 MMM, YSS-48 Snow Blower
    Hinomoto E2302 (being restored), ROPS, Turned Up Pump, Honed Injectors, Modified JD Turfs, 72" Maschio Finish Mower
    Sakai SW-25 Double Drum Vibratory Roller
    Kubota K008-3 Micro Excavator

    How I pay for 'em - Glacier Diesel Power, Inc.

  8. #18
    Veteran Member
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    Jan 2010
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    2,380
    Location
    Northern, IL
    Tractor
    Branson 2400H

    Default Re: Hydraulic pump whine after valve installation?

    Quote Originally Posted by Gypsyman View Post
    Well, I'm at a real loss here. The whine was eliminated by going to 1/2" on the feed, return, and PBY lines as noted earlier.

    The 3-point works perfectly and the power shift is fine. The system is quiet and smooth when you dead head the pump to check pressure at the valve. All is well as long as fluid isn't flowing thru the work ports via applying the control lever.

    I've checked the strainer again. No debris. Changed the filter again, no change.

    I looped the work ports to take the cylinders/load out of the equation. When the control valve is actuated you can see and feel the line with flow jumping and vibrating. You can also feel light hammering in the hard pressure line from the pump to the divider block. It really feels like air in the system but I have no idea how that could be and the fluid doesn't show signs of air bubbles. It almost feels like pressure chattering over a relief valve but when I dead head to a pressure gauge it's shows steady at 2000 psi.

    I've done a fair share of hydraulic valve installs but this one has me baffled.
    Do you have the complete model code of the Prince valve? Just curious to see what spool options you have.

    How/where did you connect the tank port on the LVT valve?

    Can you install a pressure gauge in the pressure line to monitor pressures when LVT is in neutral, when the 3PH is raising both empty and with a load on it if possible, and when the noise / pulsation starts while shifting one of the spools on the LVT valve. Trying to see if their is a constant point at where the noise starts.

    Roy
    Can you install a pressure gauge in the pressure line to monitor what the pressure is with the LVT valve in neutral?
    Artificial Intelligence will never overcome natural stupidity.

    Branson 2400H MMM & FEL

    JD 112

    BX1850 gone but not forgotten

  9. #19
    Bronze Member
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    Jul 2011
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    Otis Orchards, WA

    Default Re: Hydraulic pump whine after valve installation?

    The valve I ordered on Jamiesons recommendation is the Prince LVT1GB5AB7. This is what he uses for loader installs and has had good luck with them.

    The tank line is connected per the valves install manual with one end of the line to the T port on the valve and the other going into the return port on the left side of the 186D's transmission.

    Richard
    In the stable...

    Yanmar 186D, Turfs, Folding ROPS, YCM-60 MMM, YSS-48 Snow Blower
    Hinomoto E2302 (being restored), ROPS, Turned Up Pump, Honed Injectors, Modified JD Turfs, 72" Maschio Finish Mower
    Sakai SW-25 Double Drum Vibratory Roller
    Kubota K008-3 Micro Excavator

    How I pay for 'em - Glacier Diesel Power, Inc.

  10. #20
    Bronze Member
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    Jul 2011
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    Otis Orchards, WA

    Default Re: Hydraulic pump whine after valve installation?

    Whoops...

    The noise and "hammering" start as soon as the control lever is moved. Even if you try to creep the control lever.

    I'll have to pick up additional fitting tomorrow for inline pressure testing.

    Richard
    In the stable...

    Yanmar 186D, Turfs, Folding ROPS, YCM-60 MMM, YSS-48 Snow Blower
    Hinomoto E2302 (being restored), ROPS, Turned Up Pump, Honed Injectors, Modified JD Turfs, 72" Maschio Finish Mower
    Sakai SW-25 Double Drum Vibratory Roller
    Kubota K008-3 Micro Excavator

    How I pay for 'em - Glacier Diesel Power, Inc.

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