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    06 797

    My 797 has a little over 1000 hrs on it. I had been mowing fine today when suddenly the right wheel would not drive.

    Pulling the right handle back gives no result, pushing it forward gives a shuddering sound but no motion.
    Left side work as normal.

    with engine off and park brake off I can roll machine forward by hand. The right side will roll backward by hand but the
    left side will not roll backward.

    I can see no leaks, none in the grass and none on the trailer.

    I have not got it in the air yet, took awhile to get it back on the trailer and off the trailer back at home.

    ANy ideas what the problem could be other than obvious things I may see after I pull a wheel tomorrow and look around?

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    flyweight's Avatar
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    Welcome to GTT.

    Just a thought. Check to see if one of the bypass(free-wheeling) valves backed out.

    Click image for larger version. 

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    Using the Free-Wheeling Pump Release Valves


    NOTE: The free-wheeling pump release valves must be turned fully clockwise (closed) during normal vehicle operation.
    When the machine needs to be moved without starting the engine, use the free-wheeling pump release valves:
    1. Lock the park brake.
    2. Lift and secure operator seat platform in the raised position.

    3. Loosen the jam nut on each free-wheeling valve using a 17 mm wrench. Use an 8 mm wrench to turn both free-wheeling pump release valves (A) counterclockwise approximately 1/4 turn.
    4. Lower seat.
    5. Unlock park brake.
    6. Push machine to desired location. Due to hydraulic system drag, machine will move slowly.
    IMPORTANT: Avoid damage! The free-wheeling valves can be damaged if overtightened. Use care not to overtighten.


    7. To return to service, tighten both free-wheeling valves to 6.9 N·m (61 lb-in.). Tighten jam nuts to 19.6 N·m (173 lbin.).
    Last edited by flyweight; 08-18-2017 at 11:12 PM.
    Gizmo2 and Levi like this.
    Michael

    2019 JD Z540R, 54" cutting deck w/MulchControl™
    1984 JD 750 Tractor
    1971 JD 15 Chainsaw, ← hasn't run since ~1975

    Also have a bunch of other useless stuff.










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    Gizmo2 (08-19-2017)

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    Senior GTT Super Slacker Gizmo2's Avatar
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    flyweight, Is that one unit (motor/pump) for both wheels?
    Keith

    JD 2320, 200CX FEL/61" bucket , 46 BH/16" bucket, Artillian Forks, 72" Snow Blade, Landscape Rake, Ballast Box, PHD,
    BX42 Chipper, XUV 560 Gator, Z915B ZTrak

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    I adjusted both the release valves but there was no improvement.

    With the mower lifted, the right side wheel can be rotated by hand in both directions,
    the left side will rotate forward but not reverse. Park brake off, engine off.

    I have around 1200 hrs, I maintain it myself as I am a mechanic.
    I failed to write down the hours of the last hydraulic filter change, it was 2014 and I put at most 100 hrs a year so I should be OK there.

    I did get lax this summer on cleaning the mower, often just a quick
    blow off with compressed air. Last week I power washed it thoroughly but can't see where
    that would have caused any problems with the drive system since I have done it numerous times thru the years.

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    coaltrain's Avatar
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    Might be time for some serious diagnosis. The Deere Technical manuals are great for this - you would be able to troubleshoot the system step by step to find the problem.

    https://techpubs.deere.com/Products/ProductSearch.aspx
    ~Stan~
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    2520 w/200CX w/62D2

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    I have the service manual, always have one for equipment I own.
    (except for the Simplicity Sunstar I can't find)

    It does not help with diagnostics of one side not working.
    Gizmo2 likes this.

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    flyweight's Avatar
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    Quote Originally Posted by Gizmo2 View Post
    flyweight, Is that one unit (motor/pump) for both wheels?
    Dual pump, sharing the same housing.

    Quote Originally Posted by Technova View Post
    I adjusted both the release valves but there was no improvement.

    With the mower lifted, the right side wheel can be rotated by hand in both directions,
    the left side will rotate forward but not reverse. Park brake off, engine off.


    I have around 1200 hrs, I maintain it myself as I am a mechanic.
    I failed to write down the hours of the last hydraulic filter change, it was 2014 and I put at most 100 hrs a year so I should be OK there.

    I did get lax this summer on cleaning the mower, often just a quick
    blow off with compressed air. Last week I power washed it thoroughly but can't see where
    that would have caused any problems with the drive system since I have done it numerous times thru the years.
    I'd have to think the problem is in the Pump(s) itself. A wheels should not be able to be turned by hand if the pump is in good working order.
    Gizmo2 likes this.
    Michael

    2019 JD Z540R, 54" cutting deck w/MulchControl™
    1984 JD 750 Tractor
    1971 JD 15 Chainsaw, ← hasn't run since ~1975

    Also have a bunch of other useless stuff.










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    I sent an Email to zeroturnman.com.
    He answered my email twice even on a SUnday.
    He knew right away it was a broken shaft that caused debris to take out one side of the pump.

    When I took the wheel motor apart, the shaft was broken and there was debris in the fluid.
    He supplied info on using gun cleaning equipment and a cable to clean the lines with kerosene
    and disassembling the other wheel motor to clean it.

    Basically the entire system needs to be cleaned out and the right wheel motor and entire pump replaced.
    I have not taken the pump apart, but I bet it looks like the bad pump in his video.

    He provided this help before I ordered any parts from him, let's hope the parts ordering goes as well.

    Thanks GTT forum.
    Kennyd, Gizmo2, flyweight and 2 others like this.

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    flyweight's Avatar
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    Technova, glad to hear you're on the right path to repair.
    Michael

    2019 JD Z540R, 54" cutting deck w/MulchControl™
    1984 JD 750 Tractor
    1971 JD 15 Chainsaw, ← hasn't run since ~1975

    Also have a bunch of other useless stuff.










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    Lotsa cash will fix it. I plan to replace the other wheel motor rather than risk a problem, it has 1200 hours on I anyway.
    This is my personal mower for my property, so it hurts a little since it won't make me any money back.
    Gizmo2, BigJim55 and Herminator like this.

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