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  1. #31
    Bronze Member
    Join Date
    Nov 2008
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    72
    Location
    Canada
    Tractor
    JD 3720

    Default Re: JD Front mount 59" blower

    Again, I have no issues with however anybody wants to operate this equipment. I even operate some equipment contrary to the way planned by the manufacturer. I just think if you're going to do that you should at least understand what the starting point is. In this case the starting point is that as designed there is shear bolts for the auger. Period. If one wants to experiment that is fine.

    My blower was assembled by the dealer according to the Deere manuals. Unless someone can provide some documentation from Deere to prove otherwise. The operations manual only references the auger shear bolts. The parts manual provides the part numbers for the keys to be installed in the universals.

    Rob, I expect you missed the key. That is fine if that is how you want to operate the blower but it means you can't get full power to the blower as that 1/4 ' bolt is now the shear bolt for the impeller AND auger. Just because your dealer agrees with you means very little, all the Deere documentation disagrees. The date on the parts manual I looked at online appears to be March 6, 2012 and it still shows the keys I've described. So you are modding the equipment from what information is provided by the manufacturer, unless you think your dealers opinion overides the manufacturers written documentation. I'm more than willing to admit i'm wrong, all I ask is that someone provide documentation (ops manual/ parts manual/technical bulletin). That being said, I've left enough information on the thread for people to make an informed decision so I'm done.

  2. #32
    Elite Member Rob-D's Avatar
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    Oct 2006
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    3,078
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    Catskills
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    John Deere 3320

    Default Re: JD Front mount 59" blower

    Quote Originally Posted by xkbal View Post
    I think you'll find that what you're looking at is not a shear bolt. If the key was not installed, contrary to what the online Deere parts manual shows, then you can experiment with that bolt acting as a shear bolt. I had no luck doing that. The spare shear bolts you refer to are for the auger and have been there for a long time, it's the impeller that is missing protection. If you have a look at your operator manual it will likely only reference the shear bolts on the auger. If it mentions any other shear bolts please let me know and I'll discuss it with my dealer.

    Here's the key part number from the manual and attached is the picture from the parts manual showing the driveshaft you mentioned.

    20 M84550 Shaft Key 1 (3120, 3320, 3520, 3720 CUT)

    Attachment 286666
    OK, I just went out and checked my shaft which is off as I didn't use my blower last year. What I found was indeed a key and a bolt that I had put in a plastic bag and left with the shaft, so I would say there is no specific way to prevent the U joint from breaking if there is a jamb in the shoot impeller. Reading the info with my blower it mentions being careful when crossing a gravel area. I'm wondering if this blower is not intended for gravel driveways. Anyway, I'll have to decide how I will handle the problem as I'd rather not blow up a U joint. What Deere's thinking on this is I have no idea, my 47" blower, as I stated previously, does have shear bolts on both the impeller and the rotor. I do remember that I don't run the blower at PTO speeds until after the driveway is frozen and there is a layer of snow down so that I no longer shoot rocks out the impeller.
    Has anyone contacted JD on this? I'd like to know their answer.
    Rob

  3. #33
    Silver Member dschuffert's Avatar
    Join Date
    Jun 2012
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    125
    Location
    Beecher, IL
    Tractor
    John Deere 3720 Premium Cab

    Default Re: JD Front mount 59" blower

    Thanks xkbal. I learned a lot from this thread. I assembled the unit myself and made a lot of assumptions on what the different bolts were for. I thought the key and bolt that hold the driveshaft to the gearbox were both shear types of material (similar to small engine flywheel or crankshaft shear keys, etc.). You are correct that John Deere lists the key as a "shaft key" and nothing about it having a shear rating. I found Woodruff shear keys all over the internet but not sure what to try yet. I would like to find a Woodruff shear key that fits this application, and shears at a point before the join fatigues, but not sure what the numbers are yet.
    2012 John Deere 3720 Deluxe Cab, 300CX Loader w/ 73" HD Bucket, Artillian Forks, 681 Tiller, 72D AutoConnect Mower, 59" Two-stage Snow Blower, Ballast Box, Frontier TR2058 Overseeder, Frontier SS2067B Broadcast
    Spreader, iMatch.

    1953 Ford NAA Golden Jubilee - Currently disassembled waiting for restoration.
    1947 Allis Chalmers Model B - Still running great - handed down from my Grandfather to my Father to me.

  4. #34
    Elite Member Rob-D's Avatar
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    John Deere 3320

    Default Re: JD Front mount 59" blower

    I would try 6061-T6 or 2024 aluminum first. Key material is generally made from lower carbon steels, 1018, etc, you can try leaded steels if the aluminum doesn't hold up to your conditions. If it does fail I would go to a leaded steel, 12L14, 12L15. These are available in small quantities on the net. You can try Speedy Metals, they should have all materials I mentioned.

    For the benefit of my friends on TBN I just measured the Rockwell Hardness of the key supplied with my blower. It measures 43 on the Rockwell C scale. This means it is medium hardness, 12L14 (the "L" stands for leaded) for example measures about 14 Rockwell C.

    It's probably a good bet to shear before the shaft breaks but I would start with the aluminums I mentioned, that's what I'm going to do. I'd rather change material than shafts!

    Hope this helps and thanks for bringing this to our attention. I remember thinking about it at the time I put my blower on and should have researched it further.
    Rob

    ps: aluminum has been used as a shear material in keys for years. Briggs uses it on their flywheels, any of you who have ever repaired a Briggs engine or other small engine can attest to this.

  5. #35
    Gold Member jjmarotz's Avatar
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    Oct 2007
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    365
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    Ashton, Idaho
    Tractor
    JD 3720 cab

    Default Re: JD Front mount 59" blower

    Quote Originally Posted by Rob-D View Post
    A good idea is to also grease the cables that turn the shoot, they rot out quickly and I've changed them more than once. Grease helps keep them from rotting.
    Rob
    On the subject of these cables.
    http://www.tractorbynet.com/forums/j...er-cables.html

  6. #36
    Elite Member Rob-D's Avatar
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    Catskills
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    John Deere 3320

    Default Re: JD Front mount 59" blower

    Quote Originally Posted by jjmarotz View Post
    Thanks for the info.
    What I've found here is that the salt used on the roads deteriorates the cables prematurely.
    Rob

  7. #37
    Platinum Member
    Join Date
    Mar 2008
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    599

    Default Re: JD Front mount 59" blower

    I recently purchased a 3 year old 59 snow blower. While making brackets to adapt it to my 4110 I noticed the drive shaft did not have the key in the key way. I thought someone may have forgot to put it in but now it makes sense. Thanks for the info and I won't be replacing something that should not be there. I could not find a 47 and this 59 came up at a reasonable price. The future calls for an upgrade to a 30-40 horse power model and this will transfer.

  8. #38
    Veteran Member Rockgod's Avatar
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    Oct 2010
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    CNY
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    JD Cabbed 3720

    Default Re: JD Front mount 59" blower

    Quick update:

    Finally arrived yesterday, let it snow!



    JD 3720 Premium Cab, 300CX, 59" Front Mt. Blower, 72d MMM auto-connect deck.

  9. #39
    Elite Member Rob-D's Avatar
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    Default Re: JD Front mount 59" blower

    Beautiful! You could go commercial with that rig.
    Rob

  10. #40
    Veteran Member Rockgod's Avatar
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    JD Cabbed 3720

    Default Re: JD Front mount 59" blower

    Quote Originally Posted by Rob-D View Post
    Beautiful! You could go commercial with that rig.
    Thanks Rob!

    Commercial, I might have to. These types of deals have a way of emptying on the ole bank acc. Thank god for 0% for 60 months.
    JD 3720 Premium Cab, 300CX, 59" Front Mt. Blower, 72d MMM auto-connect deck.

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