50 hour hydraulic oil change 6 mm Allen head bilt
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    50 hour hydraulic oil change 6 mm Allen head bilt

    I am trying to finish up my 50 hour hydraulic oil change and I cannot get the 6 mm Allen head loosened. I am now using a 1/2 breaker bar and it still will not budge. Has anybody else run into this problem. I don’t want to round the Allen head inside the bolt.

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    Busman's Avatar
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    Quote Originally Posted by Frogtoons View Post
    I am trying to finish up my 50 hour hydraulic oil change and I cannot get the 6 mm Allen head loosened. I am now using a 1/2 breaker bar and it still will not budge. Has anybody else run into this problem. I don’t want to round the Allen head inside the bolt.
    Sometimes a little shock therapy works. If there is room, tap the head of the Allen wrench with a hammer whilst applying moderate force to the lever end.
    PaDave, Jeff B and PJR832 like this.
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    I took the left tire off so I do have room. I banged on the bolt with a hammer and still no luck. During manufacturing could it get crossed threaded or somehow over torqued

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    SRG
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    Right tighty, lefty loosey?
    Seems obvious, but sometimes when working from underneath, its easy to get turned around. If it's underneath, I don't know your machine.

    Try tapping the Allen key like mentioned above.
    PaDave, SulleyBear, PJR832 and 1 others like this.


    1997 JD 870 (28hp Yanmar), FWA, R1's, 300x loader, 61" bucket, 42" Titan forks, Pat's Easy Change.
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    2004 JD 797 (29hp Kawasaki) Z-Trak, 72" 7-Iron deck, Mulch blades, Carlisle AT101's.
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    I wish it was that simple. Included photo
    Attached Thumbnails Attached Thumbnails image_1558976984014.jpg  

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    A 16 inch breaker bar should easily loosen the bolt. I am afraid to pull left any harder as it probably round over the Allen head inside the bolt

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    SRG
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    What is that for? (the Allen head in the pic)
    Last edited by SRG; 05-27-2019 at 12:19 PM.


    1997 JD 870 (28hp Yanmar), FWA, R1's, 300x loader, 61" bucket, 42" Titan forks, Pat's Easy Change.
    [72" KK box blade, 72" KK landscape rake, 72" Titan pine straw rake, 72" Express Steel snow pusher{XP24}, 60" KK tiller, 60" rotary cutter, middle buster, boom pole]
    2004 JD 797 (29hp Kawasaki) Z-Trak, 72" 7-Iron deck, Mulch blades, Carlisle AT101's.
    Stihl: MS250C/18", FS70R, HS45/18".

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    The 6 mm bolt holds the hydraulic magnetic suction screen. Watching Tractor Time with Tim he is using a 1/4 inch wrench over the Allen head socket to loosen. That is how easy it’s suppose to be. Not for me
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    Hmmmm. Mine came off pretty easy. Its the allen head bolt to get at, and clean, the trans filter screen. You try hittin it with PB Blaster or Liquid torch first? Maybe you can add a little heat to it? Though i think the rupper hose may be a bit close. Also if the worst happens and you strip the allen you could always weld a nut onto it (if you have a welder) in order to get the bolt out.


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    In my experience, I have never rounded the inside hex of an allen bolt if it is fully inserted, I usually round the hex wrench or twist it. Just make sure that there is no paint preventing full seating of the wrench in the bolt. If the wrench is partially in that is when bolt rounding can occur.

    As I remember, there is a lot of paint on that bolt, both inside the hex and around it. Try getting some of the paint off with a small chisel around the outside, and a pick to clean up the inside. The tapping may also help loosen the bolt too. (like the impact advise just previously).

    Using a good quality allen key is also "key" in not stripping either wrench or bolt. Once one or the other starts to strip you're going to have trouble, so go cautiously.

    (note the reference to "key" ... maybe I should post it in that infamous thread too. )

    But seriously, be careful.

    Just my 2 cents.

    Edit. One other thing, if your allen key is already part rounded, that won't help the issue, just make it worse. Maybe also grind down the tip to a good area, but grind lightly so you don't lose hardness.
    Last edited by Tomfive; 05-27-2019 at 12:34 PM. Reason: Added content.
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