Go BottomJD 47 backhoe
 | John Weaver
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2000-04-24 15065
JeffM, I see that you have a JD 47 back hoe. I do not understand how it mounts, please explain. I see in the JD info. that the 3 point hitch is used. Thanks, John.
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| JeffM
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2000-04-25 15083
John, I actually have a JD48 backhoe, but it mounts the same as a 47, so here goes. Short version: The backhoe is actually mounted to a "subframe", not the 3-pt hitch, during operation; it only uses the rockshaft lift on the 3-pt hitch to position the backhoe on this frame mount during attachment or detachment. Now for the long-winded version (you all can stop reading right here if you get bored easily): The "subframe" I mention is actually not a conventional backhoe subframe. A true subframe usually runs half the length of the tractor or more parallel to the frame or drivetrain to provide strength and mounting stability, especially on lighter compacts built on frames (like the Kubota B-series). One of the tradeoffs then becomes subframe incompatibility with belly mowers, since they both want to occupy the same physical space under the tractor. The JD47/48 backhoe "subframe" is actually a pair of heavy steel mounting plates that are bolted to the rear axle assembly. The JD 4200-4700 compacts are heavy tractors with conventional cast iron drivetrain assemblies that provide sufficient strength for backhoe-induced stresses, alleviating the need for a long subframe. These mounting plates carry the load of the backhoe very securely close to the tractor without the play or physical separation that a 3-pt hitch setup entails. To mount the backhoe, I first pull pins and remove the 3-pt hitch draft links, draft rods, center link, and drawbar. I then back the tractor up to the backhoe with the 3-pt rockshaft arms lowered. Then I lift the rockshaft arms to engage the rockshaft pins under two "hooks" on the backhoe and continue to lift the backhoe until it seats in place up against the mounting plates (there are two other "hooks" that it seats into). Once the backhoe is seated in place there are two large L-pins that I secure with hitch pins through the backhoe and mounting plate. Then I drop the rockshaft arms a little so that the weight of the backhoe is transferred to the large L-pins. I then hook up two hydraulic hoses and I'm done. Deere calls this mounting process RSA (RockShaft Assist) and it has been engineered very well. Whole process can be safely done by one person in a couple minutes. ....
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| John Weaver
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2000-04-25 15102
JeffM, Thanks for the best explination I have received. I was not bored. I think I have a better understanding, but what is the rock shaft? The "arms" that are directly connected to the hydraulic unit? PS I talked to the JD "help line" today. The person I talked to knew less than I did. Thanks again, John. ....
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| JeffM
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2000-04-27 15132
Yeah, the rockshaft arms are the lift mechanism for a 3-point hitch. I've also seen them referred to as "lift arms". ....
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