"Spukhafte wirkung" in the idler bracket on J44 mow deck
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    Member hempdiddy's Avatar
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    "Spukhafte wirkung" in the idler bracket on J44 mow deck

    Hi please see this video.

    I was mowing and everything was going well for over an hour. After finishing one section, I moved to a new area of the yard and engaged the PTO... while the deck was in transport mode. It ran like this for about 5 second. It was after the 5 seconds I noticed the wild vibrating and that the deck was in transport mode. I lowered the deck and restarted the PTO. Same vibrating. What happened? How to fix?



    • Blades are not bent
    • Bearings are all solid
    • Both belts are fine (drive belt OK), (deck belt brand new)
    • Idler spring set to proper tension when in cutting mode



    Seems strange to me that this would just start suddenly, as it did.

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    Well,

    Watching the video, first thing that comes to mind is a piece of belt missing, have you checked your pulleys as well?

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    Member hempdiddy's Avatar
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    Quote Originally Posted by Lionel View Post
    Well,

    Watching the video, first thing that comes to mind is a piece of belt missing, have you checked your pulleys as well?
    You're talking about the drive belt, correct? The drive belt is totally intact.

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    Senior Member Gordy's Avatar
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    Quote Originally Posted by hempdiddy View Post
    Hi please see this video.


    • Blades are not bent
    • Bearings are all solid
    • Both belts are fine (drive belt OK), (deck belt brand new)
    • Idler spring set to proper tension when in cutting mode



    Seems strange to me that this would just start suddenly, as it did.

    Are you saying you had it apart and checked all of that after it started acting up? If not you need to.


    Gordy

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    Member hempdiddy's Avatar
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    Last week I had it apart rebuilt the mow deck. Right before this occurred I cut for 90 mins without hitting anything.

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    Senior Member dave1mn2's Avatar
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    Quote Originally Posted by hempdiddy View Post
    Last week I had it apart rebuilt the mow deck. Right before this occurred I cut for 90 mins without hitting anything.
    Yeah but that was then.

    Now, you have something seriously out of whack.

    Check the pulleys for caught debris, trueness and that they aren't pinched.

    Belts for missing chunks.

    You'll find it. Let us know what it is when you do.

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    Gordy (06-01-2020)

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    Super Mod Harry's Avatar
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    One thing is for sure hempdiddy. There is a lot of vibration going on under the deck from something. Looks like your going to have to take the deck off and recheck your rebuild. Please keep us posted on what you find.

    Keep the Peace
    Harry

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    It looks like you don't have enough tension on it. Your spring should have 1/8" gap between the coils. Turn it tighter to get the gap and see if it changes.

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    Member 78_220's Avatar
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    Should you find no issues with everything that has been mentioned you may have stretched the drive belt.

    I understand that you mentioned it was visually "ok" but belts can and do stretch over time. In my experience a tensioner moving that much is not at the right tension (adjustment, worn, etc) or the belt has stretched.

    I also read through my operators manual for the J series deck and found no specific warning for engaging the PTO in transport mode, however this seems to be the event that triggered your current problem. Suspect this is an old belt and the angle of the belt in transport mode coupled the initial torque of the PTO engagement caused the belt to stretch.

    If you do arrive at the conclusion of everything else being okay, I'd get a new drive belt and compare them side by side for confirmation.

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    Super Moderator tss8690's Avatar
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    Silly question but had you been mowing thick, wet grass before the excessive vibrations started? You might have a clump of grass on one (or more) of the blades that are causing an imbalance.

    FWIW, in my time working on these machines, more often than not problems can be resolved though the simplest of explanations.

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