Add More Bucket Curl to Jinma 284

[3RRL]

With both cylinders set at the same measurement, I went on to make the new top mounting holes using a 3/8" plate to lift it off the FEL arm a little also. I welded that up together and pinned the top of the cylinder to it. Where it sat on the FEL arm is where I clamped and tacked it into place. I had to grind off the FEL arm welds in the center of the arms to make it fairly flat first. You can see the new position on top is approximately 3" or so higher up the arm than before. Then I cut those sharp points off and radius'ed them.
I painted the modified QA unit yellow so you can see the difference between the old position (original plates in the last photo) and the new one.
As far as the curl improvement, I felt I was successful.
We'll have to see with the bucket attached though.



The stops I planned for worked perfectly with the cylinder sucked up.
These photos show how not only the QA plate hits the top FEL torque tube, but also how the lower QA torque tube hits the FEL arm at the same time ... positive stop(s) for the curl.
I am pretty happy at this point.

 

[3RRL]

OK, now to address the full dump position, which led to this minor change in design after my first attempt.
Look at how much dump I get now. It is nearly as much as with the original crappy set up. Except this mod also addresses the very bad thing of the rod bending over the end of the FEL arm. Looks to me this position works for that too. Note that with the 3/8" plate added to the top FEL mount, the cylinder body also does not hit the FEL arm anymore either. Looking at the photos, you can see a slight gap of light between both rod and cylinder body and the FEL arm.

The last 2 photos show the stops I made for the full dump position. Remember I told you there was several inches of travel left in full extension. Even with the 1" of cylinder travel used up for the curl, the cylinder can still extend another 3" even with the modified hole locations. So I had to make a positive stop for that to keep it from doing the same thing. I used 2 pieces of 3/4" thick steel and clamped and welded them when I got the desired dump. The stop allows full dump yet does not let the rod nor cylinder touch the FEL arm, which avoids bending.

You may ask why not just add the stops to keep the original setting from hitting and bending?
Well, I thought about that and checked it out. If you do that, because of the original mounting holes, you will lose a LOT of dump if you set the stop when the cylinder does not hit the FEL arm.

 

[3RRL]

Now, before the acid test of putting the bucket back on and trying it out, I had to make one other change.
It turns out where this new location is, there is very little room for the Zerk fitting at the lower end of the cylinder rod. So I had to turn the Zerk upside down. I caught this (luckily) before tilting the bucket up and down, or it might have snapped off. These close ups show you how the hook misses the rod end, but the Zerk was almost touching.
But in ALL positions of the bucket, the hook never touched the cylinder body or rod end. So this is a good position.
You can access the Zerk by uncurling the bucket about half way as shown in the last photo.

 

[Eagleview]

That tilted back angle still does'nt look to be enough . I hope i'm wrong .

 

[3RRL]

OK, finally a direct comparison of the new with the old...
New QA is painted yellow and the old QA (original) is painted black.
First, I see a definite improvement in curl, in fact, very close to when I took the bucket off at the very beginning to see where the hook had to be.



Second, is that I lost very little dump position. Please note that in the new QA (yellow) photo, the FEL is higher than in the old QA photo. So if you lowered it a little, the dump would be very close to being the same... not quite, but closer than the photos show.
I'd for sure rather have to live with this much dump than with a bent cylinder rod.
You can compare the photos.

 

[Eagleview]

Sorry , i was looking at the second photo in post #31 . That is a big improvement . And as you lift from the pile that angle will get greater . How's your Chinese ? You may get a job in R&D .

 

[3RRL]

lol ... how's this? 让您告别龟速网络，轻松写日志！ 立即使用！
I have no idea what it means, but it's pretty cool, hahaha.
Thanks Iron horse, I'm very happy with the results. Loretta was able to drive into a pile of dirt, curl and lift at the same time filling her bucket for the first time ever. It's hard for a beginner to learn how to do that, especially if there's not enough curl to allow the bucket to "slice off" on the upstroke. And as you say, it's better as it travels upwards.

I was hoping that this thread might help those that have a similar problem. It's not that hard to do, now that I have the proper location for the QA mounting hole. The top attachment is duck soup as once the bottom one is established, your merely tack the top one in place.
Adding the stops is a must in both directions, but especially for the dump to avoid the rod bending and cylinders hitting.

 

[Eagleview]

lol ... how's this? 让您告别龟速网络，轻松写日志！ 立即使用！
.

Well you wont get the job in R&D but you will certainly be in charge of the lunch orders...

 

[SPIKER]

that looks like the ticket great job!

mark M

 

[Brad_Blazer]

出色的工作！