D9R and 463 pull scraper

[td9clyde]

Hey Joe try it in the dirt first you get a load in it it should hold your ejector back i would try it in the dirt might work then

[Tamiya Cowboy]

Looks great Joe a true work of art for sure. I think what Steve is saying will work or the dirt in the pan. It looks in the video that there is more resistance in the cylinder for the gate then on the crowd.. Springs holding it back or a valve block restricting the oil flow to the crowd should fix the issue.

[pugs]

Do they make sequence valves small enough??

Otherwise you could put pressure relief valves in the gate cylinder lines (and a check valve in each as well), but have the dump of the pressure relief valve run the crowd cylinder instead of being a tank drain. This way the Gate cylinder would open fully first, then the relief valve would allow fluid to the crowd cylinder. Need the check valve in the non pressurozed side to allow fluid from the rod end of the crowd to bypass the pressure relief valve on the rod end of the gate cyl and return to tank. Same thing in reverse.

I'll see if I can't draw up a schematic quick of what I mean.

[ihbuilder]

you don't want to much resistance . just enough to get the apron open when empty . when loaded you'll have plenty of resistance

IHSteve

[pugs]

A crude drawing but it should work. Only downside is the the crowd will retract after the door goes down. If you want that to be reversed then just switch the relief valve and check valve directions on the rod end of the cylinders to make the sequence that the door opens first and closes last.

As drawn the door opens first and closes first. The pressure reliefs would be set just a tad higher pressure than is required to operate the Gate reliebly, but also under system pressure.

I'm not sure what is all available in the small hydraulic valves and such, so hopefully there is something you can fit in.

[jffhrvstr]

Nice work on the dozer & scraper!

[D8R]

Can´t wait to see it working!
For my own calculations, have you messured drawbar force from machine?

[rc_farmer]

Joe your pan is looking mitty fine.....can't wait to see it in Stlouie

[modelman]

Joe-your scraper looks great! I'm sure you will get it worked out. Can't wait to see it load & unload!

[dirtpusher9]

Thanks guys, it wont be long now. I put it in the dirt and MAN it does good, dozer has plenty of power, it loads like a dream, and a BIG bowl full. However the only problem is that the apron gets dirt hungup in between it and the bowl, not letting the apron move. So I think I'm going to cut the apron sides down a little and see if that helps. Going to put a stiff arm on the apron too and maybe it will force it some. I think once the apron is working right, it will solve the resistence problem. The crowd didn't hang up at all like I had thought it would, so that made me feel better. Steve, I have leather sweeps in front of the crowd too keep the roller track clean.

Dan, the dozer will push a little better than 200 lbs, not sure on the drawbar pull yet.

Thanks for all the imput guys and the drawing Jeff.

Hope to have a video soon. It looks so cool running around, not rubbing it in, just excited.

[SmallHaul]

Wow, your scraper looks great! Even just the vid of it running on the bench looks cool.

Very nice work. I can't wait to see it full of dirt.

[D8R]

Joe, can´t wait see it in action. What´s the weight of the D9? Do you have a pic on that leather sweep and will you put in some similar in the apron?
Sorry for all question but you are running into problems that I could expect to happen with my models, guess I just sitt and wait for you to solve it, just kidding!
It´s project like this one and others on this forum that keeps myself trying to get something done,
hat of, I ´m impressed.
Dan

[dirtpusher9]

Originally Posted by D8R

Joe, can´t wait see it in action. What´s the weight of the D9? Do you have a pic on that leather sweep and will you put in some similar in the apron?
Sorry for all question but you are running into problems that I could expect to happen with my models, guess I just sitt and wait for you to solve it, just kidding!
It´s project like this one and others on this forum that keeps myself trying to get something done,
hat of, I ´m impressed.
Dan

Dan, here is a pic of the leather sweeps to keep the roller rails clean.


I had planed on making a video today but had some problems when the dozer through a drive chain on one of the motors and all that torque is good until the chain raps up on the sprocket and then it gets ugly quick. Burnt up some small ground wires and twisted the motor around in the mount. But it is all fixed now so maybe when my nephew comes down next weekend I can get another video. Unless I can get my wife to do a video for me sooner.

The new apron works well except for the side of the apron are still binding so I'm going to cut them down and that should fix that little problem.

[td9clyde]

awsome Joe that is really cool i can't wait to see the videos and more pics and then what might be the next build???? lol very nice work

[dirtpusher9]

Thanks guys, the dozer is 97 lbs. Dan. I'll try and get a pic on the leather strip up soon. Not sure what I'm going to do on the apron yet, probly play with a few things.

Still running some numbers on the next build, Henry but I have narrowed my options to 2 machines. Now just got to deside which one.

[td9clyde]

Awwww well i bet i know the 2 choices 6 tires or tracks that pivot lol

[dirtpusher9]

Here is a really short video of the scraper loading. Still working on the apron issue, so I won't be showing the unloading fiasco. lol
http://www.youtube.com/watch?v=ezqdLdLWeoQ

[RAIDERS]

looks good keep up the good work...

[JAMMER]

Joe video looks great, did you solve your problem yet. Ed

[pugs]

Looking good!