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Koyker Super K loader bucket pin locations

C

CDB

Member
My new bucket for this loader will roll forward too far and can"t roll back unless I ground the bucket and back up. Does anyone have the measurements where the loader arms and middle cylinder mount to the bucket? I attempted to add pictures. My loader arms are 9 inches up from the ground. The middle cylinder is 3 1/2 inches up from ground and 8 inches out toward tractor from bucket. It seems close when comparing to this link :
http://www.purplewave.com/cgi-bin/mnlist.cgi?101130/5225/showall

Thanks!
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That is a very poor design. The bucket cylinder needs to mount above the bucket pivot point, the stroke of the cylinder will determine how far above. The way it is now you have no leverage for it to work.
 
I would weld a stout peice of bar stock between the bucket flanges on each side so they come up under the lift arms and stop the bucket from going overcenter.
Loren, the Acg
 
I think that bottom bracket, 8 inches out toward the tractor, is way too much. I would consider moving the cylinder attachment point as close to the bucket as possible. Just my opinion.
 
Rusty do you use a shorter breaker bar when you get a hard bolt to remove??? The bracket would need to be further away for him to have more force. This setup has the bucket cylinder pushing down to roll the bucket back. It is poorly designed system.
 
I am going to try. I had the same thing when I put a forklift on my Dunhum 2+2. The side holes(loader arms) are 7 inches above the bucket cyl hole. The bucket cyl hole is 51/2" from the bucket, as I remember the 7" between the pivot points was crtical. Hope this helps.
 
Yes JD it is a poor design but I have used it for years. The distance from the pivot points is causeing the bucket to "break over" and lock. If you spread the pivot points out it should prevent the bucket from going past center.
 
Thanks for the responses. I am not sure which route to go. In your opinions, would it be better to put the bucket cylinder above the bucket pivot point or re-drill the holes so that there is a 7 inch difference with a 5 1/2 inch offset. As it is now, I keep bending the pin at the bottom of the bucket cylinder (grade 8 bolt) and it is hard to get the bucket to stay flat on the ground for pushing snow. I had a Dual 250 loader previously with the same set up on another tractor that worked fine for years....
 
I think I would redrill and leave the cyl below the pivot point. My ten yr. plan is to put two cyl. on top of the arms as others but it has been 35 years.
 
Had a Koyker Big K loader, single tip cylinder just like your set up. Super K"s (neighbor has one) had twin tip cylinders.
I would agree with rusty in that it does look too far away. That being said, I think the easiest fix would be to weld a piece of bar stock where each of the lift arms attach to the bucket making "stops" that won"t allow the bucket to go past the pivot point.
Yes to JD and others, it is a poor design, but that is how early Du-al and early Koykers were built. Mike
 
(quoted from post at 14:24:08 04/13/13) Rusty do you use a shorter breaker bar when you get a hard bolt to remove??? The bracket would need to be further away for him to have more force. This setup has the bucket cylinder pushing down to roll the bucket back. It is poorly designed system.
Click to expand...

He doesn't need more force. He NEEDS less travel.
 
Rusty if you re-read his post he says he can't roll the bucket back with it full so he does need more force. Also he needs the bucket to travel less so a longer arm for the cylinder pivot would make the bucket move less and have more force.

Think about it. With the radius longer the cylinder will have to travel further to get the same amount of motion. Since the cylinder can't travel further the bucket will have less rotary motion.
 
(quoted from post at 21:18:18 04/14/13) Rusty if you re-read his post he says he can't roll the bucket back with it full so he does need more force. Also he needs the bucket to travel less so a longer arm for the cylinder pivot would make the bucket move less and have more force.

Think about it. With the radius longer the cylinder will have to travel further to get the same amount of motion. Since the cylinder can't travel further the bucket will have less rotary motion.
Click to expand...

Okay, I re-read the original post. Here is what he states the problem is.
"My new bucket for this loader will roll forward too far and can"t roll back unless I ground the bucket and back up."

Like I said, he doesn't need more force. He needs less travel.
 
(quoted from post at 21:18:18 04/14/13) Rusty if you re-read his post he says he can't roll the bucket back with it full so he does need more force. Also he needs the bucket to travel less so a longer arm for the cylinder pivot would make the bucket move less and have more force.

Think about it. With the radius longer the cylinder will have to travel further to get the same amount of motion. Since the cylinder can't travel further the bucket will have less rotary motion.
Click to expand...

Come on JD. He's saying it goes over center and he can't get it back without manually moving it back were it's supposed to be.
 
You are right, I need less travel. I think it has plenty of force - it will hold a bucket load of snow and dirt just fine. The old bucket had chains attached to limit travel, but, I thought we had the pin locations correct, so, I got rid of them. There is a K5 koyker loader with the single cylinder that is nearby. The middle cylinder appears to be the 7 inches below the loader arms, but, the distance out from the bucket appears to be the same as the arms. Would the K5 have the same measurements as the Super K? Thought about stopping and measuring if they were supposed to be the same.
 
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