What's the story on my MMM?
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    What's the story on my MMM?

    My 54" MMM seems to leave a row of partially cut grass right in the middle. I have sharpened the blades and the alignment seems good. I have noticed that the problem is worse in turns. I admit that I mow quickly but the problem is only a little better when I slow down. I was at 190 RPMs on the PTO this morning, and the grass was a little high. But it just appears that there is a coverage problem of some sort in the middle, where there is no overlap. The problem diminishes when I go over the same area again (cutting less grass). Solve this problem and you'll be the recipient of a coveted polite round of applause.

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    Keeper of the GTT Cookies dieselshadow's Avatar
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    Two things that can help. 1, make sure there is no buildup under the deck restricting grass and airflow. 2, run your mower at rated RPM. I run full tilt for optimal performance. Donít worry, it wonít hurt your machine. And you arenít saving anything including fuel by running it slower.
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    etcallhome's Avatar
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    Another thought, when was the last time you greased the spindles ..

    If after mowing at higher or recommended RPM , remove the deck and then slip belt off the pulleys and see if the middle blade turns as easy as the outer blades.
    Gene

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    JD 1025R, H120 FEL 54" bucket, 54" mmm Auto Conn, 54" Front blade, JD back hoe ,JD IMatch, 48" Bush Hog tiller, Middlebuster from MF dealer, used King Kutter 5' rear blade, a new 47" JD Front blower and Original Tractor cab w/heater.
    We have a Red Honda Pioneer 700-4 (4 seater) w/soft top , doors, and winch.

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    DRobinson's Avatar
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    If the blades are old and been sharpened many times, they will leave a streak. Compare them to new ones to see if they are the same length.
    Last edited by DRobinson; 05-06-2018 at 05:07 AM.
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    Don

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    ejb69's Avatar
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    Your blades are likely a little short. Might be time for new blades.
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    Eric

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    Thanks

    Thanks for the replies, and I will look into those suggestions next time I have the MMM off. But just mowing again solved the problem in the short run. The grass grew in some places nearly a foot in two weeks (no idea why - hasn't happened before) and when I mowed over parts of it again the cut was perfect. It may be that the grass was just too high to get it all in one cut. For the moment I will just have to plan on mowing every week until things slow down.
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    etcallhome's Avatar
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    Quote Originally Posted by drynoc View Post
    Thanks for the replies, and I will look into those suggestions next time I have the MMM off. But just mowing again solved the problem in the short run. The grass grew in some places nearly a foot in two weeks (no idea why - hasn't happened before) and when I mowed over parts of it again the cut was perfect. It may be that the grass was just too high to get it all in one cut. For the moment I will just have to plan on mowing every week until things slow down.
    As others , raise the RPMs especially in tall grass. Yes I mow at 26-2800rpm for the engine , but if grass is high RPMs go to the 3200rpm makes a world of difference .
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    Gene

    Have fun and be safe !!!
    USAR 8yr 8 mo SSG 99th ARCOM
    JD 1025R, H120 FEL 54" bucket, 54" mmm Auto Conn, 54" Front blade, JD back hoe ,JD IMatch, 48" Bush Hog tiller, Middlebuster from MF dealer, used King Kutter 5' rear blade, a new 47" JD Front blower and Original Tractor cab w/heater.
    We have a Red Honda Pioneer 700-4 (4 seater) w/soft top , doors, and winch.

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    Quote Originally Posted by dieselshadow View Post
    Two things that can help. 1, make sure there is no buildup under the deck restricting grass and airflow. 2, run your mower at rated RPM. I run full tilt for optimal performance. Donít worry, it wonít hurt your machine. And you arenít saving anything including fuel by running it slower.
    Same here - been doing that all my life.
    ~Stan~
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    2520 w/200CX w/62D2

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    Zebrafive's Avatar
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    T also mow at full throttle. I want the fastest blade speed possible. I even considered changing the gear box pulley ( I have the 62C deck) to the one from a 54C deck to increase blade speed, but decided not to try and "out think" the JD engineers.
    J
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    Keeper of the GTT Cookies dieselshadow's Avatar
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    If you were mowing very tall grass, thereís not many finishing mowers, including yours, that will perfectly cut it on the first pass. That is very normal to stripe and leave extra bits behind. Rough cut mowers will get it all in one pass but leave a ďnot-so-niceĒ finish. Two passes with a finishing mower will get it. You should also increase the frequency of how often you cut if itís that high.
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    2720 w/ 200CX FEL
    , Ken's weld-on hooks, Fit Rite Hydraulics Top and Tilt kit, Artillian forks.
    1954 60 - getting full restoration, 1964
    110 round fender in the shop for crustoration
    Ferris IS3200Zzero turn mower

    Quote Originally Posted by Gizmo2 View Post
    Dieselshadow is my Hero.


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