process to level 3pt attachment on b7800

[z0lt3c]

I borrowed a friends box blade to see if it's something I might want to purchase... it's the first time I am using the 3 pt linkage on my B7800.

I managed to get the two lower links and top link connected to the 6' box blade, but the blade is sitting at a severe right to left angle. I have played with all types of adjustments on the lower link turnbuckles, but I can't seem to level out the implement (although this did seem to center it behind the tractor)

It appears that the links which connect the lower links to the lower link lift arms are at different lengths? One of these links is solid and the other is double threaded with a grease fitting. My assumption is that I need to shorten the double threaded link to match the same height as the solid link?

I can't seem to figure out how to do this with the attachment connected. My only thought is to take the attachment back off and then disconnect the double threaded lift arm connector, shorten the lower link arm connecting fork, and then re-assemble everything. I am thinking there must be a better way because this would be a major PITA if I had to make all these adjustments between multiple attachments (box blade, brush hog).

Any help appreciated

 

[DWW68]

You are correct on how to level the box blade. You should not have to remove the box blade to make the adjustment. With the tracktor on level ground raise the blade so it is just off the groung. I use a cressent wrench to turn the adjustable linkage. I stick the handle part of the wrench into the loop on the adjuster to breakit free from the lock nut, move the lock nut out of the way and turn the adjuster with the handle of the wrench. You can watch the blade move while you are doing this, and stop at the desirerd setting. It is pretty easy to do. Once the lift arms are level there should not be any reason to change them for other pieces of equipment unless you want the item at an angle. If the pins for the lower arms are bent up or down you may need to adjust to correct levelness. once you play around with it, you will see how easy it will become.
Dan

 

[z0lt3c]

Thanks for the response, at least I am on the right track...

The adjustable linkage is setup with a top threaded connection to the lift arm, a cylinder with a grease fitting and loop, and then a bottom threaded connection with a fork to attach to the lower link arm. There is one nut on the top threaded connection above the cylinder

I did try to turn the adjustable linkage (didn't think of using a crescent wrench in the loop, that makes it much easier) but this doesn't seem to raise or lower the attachment. Rather, it just seems to change how much of each threaded end is positioned inside the adjustable linkage.

I mentioned taking off the linkage because it seems I need to turn only the bottom fork section to shorten the distance between the center cylinder and bottom fork.


What am I doing wrong here?

 

[Page2]

Thanks for the response, at least I am on the right track...



I did try to turn the adjustable linkage (didn't think of using a crescent wrench in the loop, that makes it much easier) but this doesn't seem to raise or lower the attachment. Rather, it just seems to change how much of each threaded end is positioned inside the adjustable linkage.



What am I doing wrong here?

The adjustable link works like a turnbuckle--the more the threaded ends are in the turnbuckle, the shorter the overall length, and vice versa. By shortening and lenghtening the adjustable linkage, you are raising and lowering that side of your attachment. And subsequently leveling it.

 

[z0lt3c]

Must be something wrong w/ my adjustable link then.

Regardless of which direction i turn it in, it doesn't seem to ever pull both ends in. One direction will consume more thread on the bottom and expose more thread on the top, and opposite is true for turning in the other direction.

In retrospect, the turnbuckles that control the centering of the attachment do pull both ends in when turned one way and lets them both out when turned in the other. I assume this is the same behavior I should have in a functional adjustable link.

 

[teg]

When I cut ditches, my BB will be tilted as in the first photo. To level, (or flatten) you use the adjustable arm. To do that, I place a 4"x4" board in the middle of the box blade to relieve the weight of the BB so I can turn the adjustable arm. I will have to play with the 3ph, raise and lower back down on the 4x4 so that the threads are not under pressure. With the board in the middle of the BB, it allows one side to drop and the other side to rise up.

I just re-read your last post, you are saying that you turn the turnbuckle, the distance doesn't change but the turnbuckle slides up and down... that's just not right Do you have a photo of the threads

 

[MFL]

Hello,

Just used this function this weekend to angle my box blade. I needed to dig a shallow trench, and by lowering one side of my BB I can use the corner to dig a trench about 3-5 inches deep.

If you have the lock nut loosened and you're turning the link that the two threaded ends connect to, you're doing it right. The only reason it would not work is if the center linkage has both ends threaded in the same direction. One end should be threaded clockwise and the other end counter-clockwise. This allows any turnbuckle linkage to either push or pull both ends at the same time. If that's the case, there's nothing for it except getting a new center link.

Cheers,

MFL

 

[z0lt3c]

I had a friend w/ some more tractor experience then me come and look at my side link today. It seems there was something wrong with the way the bottom fork was threaded into the adjustable side link. We removed the bottom side link fork, cleaned up the threads and threaded it back into the adjustable cylinder and after that, when turning the cylinder, the side link correctly expanded and contracted.

Neither of us could quite figure out what was wrong with it originally but it does seem to be operating properly now and I was able to level out my attachment.

After only 2 days I am already craving a hydraulic top link and side link!! What a money pit this tractor can become... even worse then my german cars.

Thanks for the help!