D125 Drive belt is loose on a brand new belt.
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Thread: D125 Drive belt is loose on a brand new belt.

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    D125 Drive belt is loose on a brand new belt.

    I just changed the main drive belt in my 2 year old D125 and put on new pulley's as well. I ordered the parts from John Deere (GX20006KIT1) so I didn't have any issues. I noticed the old belt was pretty tight and when I put on the new one there was a lot of slack. I compared the belt size and pulley sizes and they are the same. I made a quick video as a visual. I know it's something dumb I'm doing but not sure what. Can someone tell me what I did wrong?


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    felixm22's Avatar
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    Doesn't look like a complex belt route but double check you have it going around the pulleys correctly.

    Click image for larger version. 

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    John Deere 318, 50in deck, 54in blade w/ power angle

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    jgayman's Avatar
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    Quote Originally Posted by felixm22 View Post
    Doesn't look like a complex belt route but double check you have it going around the pulleys correctly.
    I believe he is referring to the main drive belt, not the mower deck belt.
    2012 2720 -- 200CX Loader -- 54" Quick Attach Snow Blower -- Frontier LR5060 Rake -- Land Pride RB1660 Blade (Hydraulic Angle) -- Artillian 42" Forks -- Ken's Bolt on Grab Hooks -- Fit Rite Hydraulic top-link -- 2013 X500 for mowing duties

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    felixm22's Avatar
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    Quote Originally Posted by jgayman View Post
    I believe he is referring to the main drive belt, not the mower deck belt.
    Jgayman You are correct. Here is the drive belt digram:

    Click image for larger version. 

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    longfello likes this.
    John Deere 318, 50in deck, 54in blade w/ power angle

    Looking for JD Parts check here on JD's official parts website.

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    jgayman's Avatar
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    I see there is a spring and tensioning mechanism. Is something stuck or did something get disconnected? Can you confirm that the tensioner has full range of motion?
    2012 2720 -- 200CX Loader -- 54" Quick Attach Snow Blower -- Frontier LR5060 Rake -- Land Pride RB1660 Blade (Hydraulic Angle) -- Artillian 42" Forks -- Ken's Bolt on Grab Hooks -- Fit Rite Hydraulic top-link -- 2013 X500 for mowing duties

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    Quote Originally Posted by stroker351w View Post
    I just changed the main drive belt in my 2 year old D125 and put on new pulley's as well. I ordered the parts from John Deere (GX20006KIT1) so I didn't have any issues. I noticed the old belt was pretty tight and when I put on the new one there was a lot of slack. I compared the belt size and pulley sizes and they are the same. I made a quick video as a visual. I know it's something dumb I'm doing but not sure what. Can someone tell me what I did wrong?


    Is the brake on? It normally slacks the belt before actually applying the brake. When you release it the belt should get tight.

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    I believe you have routed the wrong side of the belt thru the idlers. The side of the belt you had your hand should wrap thru the idlers.
    I could be wrong of course, but looking at a belt diagram from the top down, and then looking at the tractor from the bottom up, is a bit confusing for me, too.

    tommyhawk

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