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  1. #1
    New Member
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    branson 4720h

    Default 4720h jerkiness and hydro whine

    I've had my 4720h for a few months, and it now has about 45 hours on it. Two things bother me. First, there is a pronounced jerkiness in 2nd range, especially when gently pressing the go-pedals. The other issue is a loud whine from the hydrostatic transmission, especially in high range. Thoughts? Other than that, I'm pretty happy with it.

  2. #2
    Elite Member
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    Guin, AL
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    Kubota L3200 DT w/LA524 FEL, Loaded rear tires, LP RCR 1860 5' Cutter, LP RTA 1258 5' Tiller, LP PFL 2042 Pallet Forks w/60" Extensions, KK BB60 Box Blade, KK PHD-12" Post Hole Digger

    Default Re: 4720h jerkiness and hydro whine


    To the TBN forum. You came to the right place to get answers.

    A lot of people say that using full synthetic hydro fluid will quieten down the transmission.
    US Air Force Retired (1966-1988) ... mike

    Kubota TG1860G w/RCK54TG
    24 HP V-Twin Pro Yard Tractor
    Ohio Steel 12.5 cu. ft. Poly Swivel Dump Cart

  3. #3
    Platinum Member Slowpoke Slim's Avatar
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    Jan 2017
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    580
    Location
    Bismarck, ND
    Tractor
    Husqvarna YTH24V48 riding mower, Branson 3725CH

    Default Re: 4720h jerkiness and hydro whine

    Welcome to the forums.

    I talked to my dealer about synthetic hydro in my tractor when it came up for service. He said he's had a couple customers that switched to synthetic and weren't happy with the switch. Seemed to make the hydro more noisy and less smooth. I think they even switched back to standard hydro. I am running synthetic engine oil in mine, but not synthetic hydro. My dealer did have to change the hydro type he put in mine at the 50 hr. The first oil he put in was too heavy for winter use up here, and was giving me problems. I'll ask him what he switched to in mine, but I've had no problems since, even running in the hot (90's) summer running my bush hog.

    See if you can find out what hydro oil is in your tractor now, maybe a change to a different oil will help the issue as well?

    There is an adjustment to the forward/reverse pedals, to keep them "centered". When your tractor is sitting in gear, on level ground, does it sit still, or does it creep forward or reverse? Perhaps your pedals just need a slight adjustment?

    I would talk to your dealer about the issues you're having. There really shouldn't be any "jerky-ness" to your movement pedals. I'm going to assume your hydro level is correct, and you can see it in your sight glass when on level ground? It can be really hard to see through the glass, the oil is so light and clean. They do make a dye you can put in it to make it easier to see through the glass.

    It did take me a few hrs run time to get used to the pedals on my tractor. They are quite touchy, both coming on, and coming off the pedal. I have to very slowly press the pedal down to get a smooth take off in 1st or 2nd range. Same with coming off the pedal, very slow and smooth, or it's like slamming on the brakes. The "pedal response" is instant.

    3rd range on my hydro I only use when I transport or "road" my tractor to my neighbor's or a buddy's house a few miles away. I never use that range around my place, or to do any work on site. The gear range is just too tall for "work", just for running at road speed down the road. And yes, 3rd range definitely whines pretty good while I'm using it, but once I'm up to full road speed, on level ground, then the whine becomes very faint, almost completely drowned out by the engine.

  4. #4
    Veteran Member
    Join Date
    Nov 2016
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    1,155
    Location
    Santa Cruz Mountains, Ca
    Tractor
    Branson 3725H

    Default Re: 4720h jerkiness and hydro whine

    Mine whines when I'm making it work hard with a small amount of HST pedal. Like when starting up a steel hill in second range or starting out on the flat in high range. My last tractor also whined more in similar situations. I don't think mine is jerky in second range but it is responsive.
    My dealer said not to use SUDT.

  5. #5
    New Member
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    Jun 2018
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    branson 4720h

    Default Re: 4720h jerkiness and hydro whine

    Quote Originally Posted by Slowpoke Slim View Post
    Welcome to the forums.

    I talked to my dealer about synthetic hydro in my tractor when it came up for service. He said he's had a couple customers that switched to synthetic and weren't happy with the switch. Seemed to make the hydro more noisy and less smooth. I think they even switched back to standard hydro. I am running synthetic engine oil in mine, but not synthetic hydro. My dealer did have to change the hydro type he put in mine at the 50 hr. The first oil he put in was too heavy for winter use up here, and was giving me problems. I'll ask him what he switched to in mine, but I've had no problems since, even running in the hot (90's) summer running my bush hog.

    See if you can find out what hydro oil is in your tractor now, maybe a change to a different oil will help the issue as well?

    There is an adjustment to the forward/reverse pedals, to keep them "centered". When your tractor is sitting in gear, on level ground, does it sit still, or does it creep forward or reverse? Perhaps your pedals just need a slight adjustment?

    I would talk to your dealer about the issues you're having. There really shouldn't be any "jerky-ness" to your movement pedals. I'm going to assume your hydro level is correct, and you can see it in your sight glass when on level ground? It can be really hard to see through the glass, the oil is so light and clean. They do make a dye you can put in it to make it easier to see through the glass.

    It did take me a few hrs run time to get used to the pedals on my tractor. They are quite touchy, both coming on, and coming off the pedal. I have to very slowly press the pedal down to get a smooth take off in 1st or 2nd range. Same with coming off the pedal, very slow and smooth, or it's like slamming on the brakes. The "pedal response" is instant.

    3rd range on my hydro I only use when I transport or "road" my tractor to my neighbor's or a buddy's house a few miles away. I never use that range around my place, or to do any work on site. The gear range is just too tall for "work", just for running at road speed down the road. And yes, 3rd range definitely whines pretty good while I'm using it, but once I'm up to full road speed, on level ground, then the whine becomes very faint, almost completely drowned out by the engine.
    The oil that's in it is what it came with new....whatever that is.
    It's not the pedals I'm talking about, it's the movement of the tractor as I depress the pedal. In second range, if I press lightly on the pedal, the tractor hesitates, then lurches a bit, then then hesitates, then lurches... very annoying.
    The hydraulic fluid level is correct.
    In low or high range, that pause/lurch effect is not present. But there is a lot of hydro whine in high range. I don't love it but I can live with it.

  6. #6
    Veteran Member
    Join Date
    Nov 2016
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    1,155
    Location
    Santa Cruz Mountains, Ca
    Tractor
    Branson 3725H

    Default Re: 4720h jerkiness and hydro whine

    Mine has a bit of that lurching feeling at very low speeds. I think it's the liquid in the filled tires sloshing.

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