How to Change the Shear Hub on a John Deere MOCO Disc Mower

Changing the shear hub on a John Deere MOCO disc mower on a dairy farm in Wisconsin. It hit a rock and sheared a "shear hub." We can see that all are lined up with every other one and the third one from the right hand side is hitting the one next to it. We shut it down right away. It hit against the ones next to it. we got to pull the "turtle" off with a Dewalt impact driver and remove it. This video might be helpful for someone. Things are going easier if they aren't connected to the tractor PTO. The bolts do have Loctite on them but the Dewalt does break them loose. The shear hub is a rectangular piece with teeth on it around a gear in the middle that we can pull off with an impact driver. There is a lock but the shear hub has teeth and is designed to not have all the teeth on it so that it actually will be sure to shear. I'll use a hammer to line it up. We lined it up and are checking to see what it looks like. Here's the shear hub. You can see the teeth are sheared off it. Better to shear the shear hub than the gear. We'll clean off the pieces of the shear hub to make sure they don't get stuck in there. here is the part number. AE71036, it was about $80 to $100. They come with instructions on how to do this. I used to write manuals like that. that's what a good shear hub looks like. They got enough teeth to work but enough to shear so you don't run into a bigger problem. you have to time this to make sure it doesn't run into other discs. There is a timing mark on the gear and the hub and you line up the two marks to make sure they fit right.
(5:08) where he talks about lining up shear hub marks to make sure it fits.

[jimon]

Just bought an older MoCo . Thanks for video.

[jacob]

We had this exact problem. Thanks for the helpful video!

[harrymorton]

just bought a 630, guess it works the same? thanks alot.

[andylieffring]

How do you like the flails as compared to rollers?

[sacongo]

Truly believe John Deere has been making most there profits in part sales for the last 20-30 years I had a JD sickle style mower conditioner it was new then my friends New Holland and my neighbor had old international they both did more cutting than me and I had more breakdowns. 100 bucks for a Shear Hub I'm surprised the engineers didn't make it a little heavier and little more complex to charge you $200 to $300 that's what you usually spend when you visit the JD stealership.

[farmingforfunandprofit]

John Deere Usually Handles sound equipment but When it came time for us to purchase Hay Equip, our first mower was sold by The J.D. dealer was A kuhn.... we kept it one year, sold it and bought a Krone 320 Easy WE presently have 3 mounted on KMC 4760 Caddies.... We average about 600 to 800 acres a year, , , , During the last 6 years of use we have yet to replace any roll pins in the cutter-bar protection Our Variety of Hay has thin stems and slender leaves, so not much drying time is gained by conditioning....