Steamer

[RCLogger]

This looks like your ADT Rob !

https://www.youtube.com/watch?v=9wOqtNVsSx4

[mcCracken15]

Magom has aluminum ones and aluminum sprockets that were for the tracked loader. Prob the same

[Cooper]

I can't believe I missed your progress on the mammoth, particularly the lift cylinders. I'm working on a similar project and came to the conclusion to make double acting cylinders. Problem I found was like you said about having the holes in side of cylinders. I still have to tackle a cylinder head with both ports on it and tube inside first stage. Hade same thing with cylinders not coming down very well with reversing pump. But it is possible and in a couple months I'll not be able to put it off anymore .

[steamer]

Well fellas looks like Greg let the Cat out of the bag, so to speak. Greg and I did a little horse trading in the spring and we both started our part of the build then. He did the chassis and I'm doing the box. The machine I chose was the Cat D400E ejector.

Greg worked his magic and turned out a great chassis and cab assembly by mid summer and I took the summer off and fell behind. Fabricated the box out of steel and aluminum with a lot of the work done on my mill. Progressed this far and now have the tail gate operating as per the video. Here's a couple of pictures so far



I was able to find some of these small gear motors used for rc aircraft landing gear and the fit in where the hydraulics cylinders for the dump door goes and the speed is just about right

The real machine has two cylinders but I used the other side to install micro switches to control the open and closed function and have them on the the radio gear switch.

Now it's on to the ejector shuttle and slider, thanks for looking Rob

[RCLogger]

You better get that ADT ready to go to work, as Reg will need help to make his Dirt Bike Track Flat ! He has to knock those jumps down before he breaks a finger nail...
Lots of dirt to move. Full time work for a few years ! hhaha

greg

[steamer]

Some of you were wondering how I made out with the cylinders on the 789. After I saw the the multi stage cylinders on rcbrmin web site I ordered up a pair of cylinders, they are well built and you can completely rebuild then if needed.

Bore sizes are 21mm 17mm 13mm and 9mm with a total stroke of 60cm.


As I only needed an 8.5in stroke I removed the top two stages and modifyied the small bore rod so i could feed the cylinder from the rod end.
I should say that the real trucks have flip over valve on the dump box circuit the senses when the load goes and changes the pressure to the down side of the cylinder.
In the video you can see what happens to me with an 25lb load of buck shot in the box as it rips the cylinder mounts right out of the box .

https://www.youtube.com/watch?v=5fOYh-MdV8s

[tracksntreadslou]

Awsome rob...perfect speed ..with a little reinforcement this build is done ..now for a 992 to load the suckr lol ..Greg and i will need bigger buckets for the excavators in the meen time been..lol

[Lil Giants]

Sweet work Rob, it's great to see you making headway on this project again.

One these summers soon I hope to get back out to the Island & catch up on what's new with Lou & Greg's workshops & see your spread too.

[sandfarmer]

It's a shame photobucket totally ruined a lot of our threads!