The risk of damage to the aluminum rear axle assembly that GTT member Driveshaft is referring to, is from pushing backwards on implement connections which are meant to be pulled forward.
If the edge of the blade catches something solid, it can put a tremendous strain on the housing where the top link connects and snap off the flanges which hold the top link pin and secure it to the rear of the tractor.
It's happened before to others here on GTT. Some were able to have the damage welded, others were not so lucky and had to replace the rear case at incredible cost (if I remember, it was more than $7k in parts for the case).....
Personally, I would do the following if I HAD to use a rear blade on my machine...
1. I would go 5' minimum and preferably 6' in width.
2. I would put a flexible rubber squeegee edge on it the plow entire width, with about 1.5" of rubber BELOW the steel blade scraper edge. This will help to protect you and the machine from the corner of the blade or the cutting edge from"digging in" or catching a fixed object. The rubber edge, when installed correctly, will clear snow very well, but also provide important protection for the machine, operator and even the landscape.
3. I would
pull most snow forward to clear it and angle move it off the driveway.
4. I would be
EXTREMELY careful pushing snow backwards,
especially into snow piles with the rear blade. Prior placed piles freeze solid and its like hitting solid rock at times.
5. Also be very careful pushing snow OFF the driveway when going backwards. All it takes is one solid object and you find out just how violently the tractor stops, aluminum case tabs crack and bones can break.
6. The 3ph arms and top link are meant to be
PULLED behind the tractor, its not designed to be a "push implement". While some limited pushing is often done, I would certainly be very careful in doing so and limit the need to push backwards as the machine isn't designed to be used in this manner. Same with pushing backwards with a box blade. It's done, but not without incredible risk.
The tabs to mount the top link to the rear case and how your rear 3ph blade is connected to your tractor, are in the rear trans axle housing, which is cast aluminum. Many tractors have cast iron rear axle castings and assemblies. Weight is a GOOD thing on a tractor which makes cast iron an excellent choice. However, the 1 and small 2 series Deere machines use aluminum rear trans axle case assemblies, probably for reduced production costs and machining flexibility.
Aluminum is more likely to break than a comparable cast iron housing under extreme loads or shock impacts.
Here is the image and cost from the John Deere parts catalog. Keep in mind, this is simply
the parts cost, not labor. Just be prepared that if you shear the top link tabs off the rear trans axle case or otherwise cause damage to your machine which is under warranty, Deere is likely to balk at repairing it, possibly claiming the machine has been "misused".......
Simply be aware......as it has happened to others before.........and its a very expensive lesson to learn. Sure, the price shown is for the entire assembly and you can purchase the bare case and transfer components. But surprisingly, the case components aren't much cheaper than the entire assembly and the labor cost of transferring all of the parts from a machine with a broken case to a new case add up very quickly....
In many cases, its less expensive to buy an entire new component, than to transfer all of the internal components from a damaged case to a new case because of the labor involved.
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