Re: D8R +463 in 1/5,6
 

Too bad you couldn't put a release on the planetaries like I have on my manlift, when it breaks down, you remove covers for the release buttons, push them in to freewheel the hubs.

Re: D8R +463 in 1/5,6
 

Too bad Warn 4wd hubs are out of scale, lol!
(they're on American 4wd pickup trucks)
Cheers, Neil.

Re: D8R +463 in 1/5,6
 

Wow! I love the little details! In a larger scale like this, you really can see all the small touches, and they add so much to the model. I bet when it's finished, and in the proper outdoor setting, it's going to look like the fullsized machine it replicates!

Re: D8R +463 in 1/5,6
 

Wow, over 50.000 views! Could never dream that there so much interest in my build:o:o

Thanks for all nice words, keeps me going. Guess I owe you a update, no pics because nothing new to show. Did work this weekend sandblasting some components, old paint was chipping (2K). With new primer and a top layer today, went back to borrowed shop to pics up att parts, only to discover that new paint didn't dry correctly like before:mad::mad:

Since the shop I borrowed will be in business tomorrow morning, had to bring all parts back home, trying to do as little harm as possible. This is the last time I will have a limited time when painting. So much can go wrong and it did!

Was planning for a show 2 weeks ahead but guess has to cancel that now. Will not do any repainting before machine is working.

But weekend was not totaly disaster, did find a solution on the rubber cusions in bogie assemblies. Did move the steps on push arms to a correct lower position (did not have any pics with me when I welded them last week:mad: )

By the way, said earlier that I have built this during the last 10 years, that's correct but found a drawing I made, dated to 1998 on a D8N. Lucky for you that this forum was not started at that time, compared to other builds here this is a borring slowly build!

Happy eastern
/Dan

Re: D8R +463 in 1/5,6
 

Last update before start up of engine:)

Did get most things done for this weekend show here in Stockholm, now only missing windows for cab, hydr lines to ripper tooth cylinder, lamps.
Everything else done. No, engine not started, the gray over engine is some sun reflections!
http://i1014.photobucket.com/albums/...psd2cc2ac5.jpg

Yes, I know the ripper should be yellow but couldn't start up painting equip only for this item, will do that later
http://i1014.photobucket.com/albums/...psdc163bc6.jpg

Some other pictures showing displays
Next to me was nice gentleman with a 1/6 Tiger tank, electric powered
http://i1014.photobucket.com/albums/...ps67921979.jpg

Some RC trucks at display
http://i1014.photobucket.com/albums/...psa72a7992.jpg

Nice small scene with a Beetle bus
http://i1014.photobucket.com/albums/...psf2ba54c1.jpg

A 1/24(25) scale model of an UPS tractor
http://i1014.photobucket.com/albums/...ps3c6b20fc.jpg

Old beaten Volvo F16 truck, plastic 1/24
http://i1014.photobucket.com/albums/...ps1696f840.jpg

/dan

Re: D8R +463 in 1/5,6
 

Screw that!!! Sink it in the dirt & burn the paint off... is how it should look. ;) :D

Re: D8R +463 in 1/5,6
 

Thanks for the update Dan, great photo's... I am sure your CAT WOOOWED the people at the show...

cheers
Greg

Re: D8R +463 in 1/5,6
 

This has to be the best build ever your skill is amassing do you keep a parts list and cad drawings for parts

Re: D8R +463 in 1/5,6
 

Truly amazing work. Can't wait to see some video....

Re: D8R +463 in 1/5,6
 

Hi everyone, hope you have nice holidays!
Have not been so active with this Cat, but did get it running 3 months ago.
Found out that servos did not work as well as planned, felt like not having enough power (they should).
As you can see on link to vid bellow, that day model was only doing a left turn.

http://www.youtube.com/watch?v=psCaubtK4uo

Now I have new servos, got the holder cut only to get it together. But it's winter and have no warm garage to work in so have to wait (what is a couple of months, been building for 10+ years now).

Another problem is heat, engine getting to hot. Have tested removing noice damper inside homebuilt muffler, ended up mounting original silencer instead, hood and sides can not be on model with this muffler. Have to find another solution. Will try make a exhaust system without muffler to see if temperature gets lower.

And there's still some issues in hydraulic system. Can say that I was quite close to remove engine and hydraulic drive line, replacing it with electric motors. I know now that my size of model is as small as possible to build with this, components, tubing, hoses and all oil needed to get it running is just to much. A scale 1:5 should have been useful, every bit inside is used (of course cab could been used for oil and others but that's no option for me).

Some design errors made on homebuilt hydr cylinders has to be corrected to, but I'm supriced how good cylinders for blade turned out. Still more than 3 months since model was runned, blade is in air! That's tight cylinders, and weight of blade is almost 50 lbs.

Yes Jack, have all drawing saved on the model, but there will never be another made by me, just to many other interesting models to be built.

During the last months I have been active building some railroad stuffs, will post that in a seperate tread later.

Merry Christmas and a Happy New Year to you all!
Dan

Re: D8R +463 in 1/5,6
 

Very nice dozer, to say the least!! Your issue with the motor may be not enough air flow over the motor to keep cool. Electric may be the best way to go. With your machining abilities, it should be no problem to make a drive system for the dozer. Ripper looks OK to me. Just needs to be pulled thru the dirt a few times and nobody will know its not yellow.

Re: D8R +463 in 1/5,6
 

The Honda engine has a built-in fan that should keep engine cool. Have been thinking to add extra fan to get more air in-out of engine room.
Can't so much about engine (either), but if muffler don't let exhaust out easy I guess engine will have to fight harder to get mowing. Will test with new exhaust pipe.
Yes, yes, know wrong color on ripper:o but a soon model is up running good, all paint will be gone:D

Re: D8R +463 in 1/5,6
 

Hi Dan Merry Christmas to you. Only a suggestion but you could try some computer fans under the hood to cool it and help remove exhaust gases. This is a very nice dozer and Big hope you get the kinks worked out so you can really enjoy using it. Ed

Re: D8R +463 in 1/5,6
 

D8R-dozer looks great and seems to have plenty of power. Hope you get the cooling problem worked out. This machine could do some big time pushing!!!

Re: D8R +463 in 1/5,6
 

Yes Ed, have had same idea using such fan being powered from rc battery (have a large one and radio has voltage warning). Still think it's the homemade muffler causing the problem. A friend of mine installed a electric device that starts fan automatic when engine gets to a preset temperature.

Dan

Re: D8R +463 in 1/5,6
 

Did finaly get new servos installed for hydr valves to drive motors. Did run good with full control:).
Next day it was planned to put model in (warm) storage during winter, started up engine only to realize that there was something wrong with valves for blade. Cylinders was pushing the blade downwards all time, only having control when lifting blade (then back down again):mad::mad:

Had to remove gears in hub reduction to move it for transport to storage and knowing that machine has to be disassembled AGAIN totaly (except left track) to get valves and servos for blade/ripper function out.

Not so happy anymore, model in storage now for next 3 -4 months. Don't know what's the problem but guessing I'll have to change servos for those functions to. A little frustrating, as said before, was very happy with blade sitting in air for 3 months time.
Next model will be electric:)
/Dan

Re: D8R +463 in 1/5,6
 

Let do like this
:mad::mad::mad::mad::mad::mad::mad::mad::mad:
http://i1014.photobucket.com/albums/...ps8088c9a2.jpg

http://i1014.photobucket.com/albums/...ps718842cf.jpg

After a long brake (winter) I finaly had new servos installed in almost complete empty shell. The positive is that new servos are stronger, easier to "hold" centre position on valve. They are a little bigger, did check that compared to hydraulic motor diameter, it should fit.

http://i1014.photobucket.com/albums/...ps430da44b.jpg

It did NOT, the lower connector to motor, it's screw hits the servo, making it impossible to get assembly in right place. The valve hits rear end of chassis, no margin there. After another hour trying to get in place I packed up.
It looks like model has his own life, trying to make it as hard as possible for builder.
As I see it today there's 3 options
1. replace servos to same as before
2. rebuild hydraulic connectors and valve position (not much room available before hitting cab floor, maybee a complete redesign of hydaulic system.
3. rebuild machine to electric drive

My interest in this model is dropping, after 11 years and say +2000h in it, not to mention the cost, it's to much to scrap (luckely I didn't have a big hammer today).
Will let it sitt there for a couple of days, then decide what to do.
/Dan

Re: D8R +463 in 1/5,6
 

D8R-sorry to hear that. This model is way to nice to give up on :eek: I can say this is one of the problems of almost finishing a model without checking all systems but you probably don't need or want to hear that :D. I no nothing about hyds. but I was not aware that it took a strong servo to hold valves on center. Could it be the quality of servo that you are using? I say just give it a few days and then slowly work out each problem. You have built a great model and I am sure you can figure this out.

Re: D8R +463 in 1/5,6
 

Hey dan how much room do you need ..Is it possible to turn the hex part round on your lathe then machine a hex into the backside so you could tighten with an allen wrench ..I take it thats an o-ring seal

Re: D8R +463 in 1/5,6
 

Yea don't give up, never give up,,, I am new to these things and have found many many misfortunes with build design. But after being excited to see it work to only be let down by something failing I've left it alone for a bit to come back with something that works better. I'm sure with the talent you have displayed in the building of this model that you will find a way to make it work. It's all there just have to find that final solution. Sometimes I think of breaking out the small toolbox I have in the corner, it's got a hammer and vice grips,, a big hammer!! I haven't had to use it yet,,lol!! Have you thought of low profile servos? This is a really cool model you have and how sweet will it be when you do get it running how you envisioned!!

Re: D8R +463 in 1/5,6
 

http://www.hobbyking.com/hobbyking/s...18sec_34g.html
Just some cheep low pro servos

Re: D8R +463 in 1/5,6
 

Hey Dan, This is quite the build and there's no doubt that none of us what to see you give in on this. As tracksntreadslou said; could you perhaps fabricate some smaller hydraulic fittings? The pipe work looks to dominate the rear section. Given the thread sizes, it was no doubt easy to pick "off the shelf" fittings for plumbing it up, but i'm sure a man like you with such skill could miniturise some of the bigger fittings. Perhaps it may hinder flow rates and performance to some extent, but would result in better setup of the servo's, etc........

Keep at it buddy!

Re: D8R +463 in 1/5,6
 

Hi Dan

This is a great model with fantastic engineering.
I know what you mean when you think the problems can't be solved. But don't give up!
Let it sink in, give it time, then you will find solutions and make it a better model.
See it as an engineering challenge.

Kerst

Re: D8R +463 in 1/5,6
 

Hey Dan, Like everyone has said; DON'T GIVE UP! I want to see this model work too. I know it's fun to operate a model but Modelman has said in the past to me that building it and the challenge is more fun than just operating it. I have found that out with my dragline. Once this is figured out you will be able to say; "I've been there and done that"
With my model as time went by and more information was acquired, there are parts earlier on in the build I made that I could go back and re do to make it even better. So with your trial and error now you know what you have to do and I know you can do it! Who cares how long it takes, This is supposed to be your hobby to relax. There isn't some customer who has no knowledge of what it takes to do something breathing down your neck wanting it done NOW!

Re: D8R +463 in 1/5,6
 

Sorry to read about your frustrations! It's such a nice model I'd hate to see you give up too. Sometimes you just have to take a step back and work on another project that can give you some level of satisfaction and accomplishment, while thinking of ideas and solutions to the problems with the model. You'll get it figured out! You've made it this far, and have overcome what I think would be the biggest hurdle already. This part of the project is just fine tuning. It's a pain to have to redesign and revamp things, but if you can come up with a better way, go for it! You'll be glad you did in the end.

Re: D8R +463 in 1/5,6
 

Thanks all friends here at RC T&C for nice words and suggestions. You are probably right that this is a part of the process building from scratch. But I thought I had ovecomed this stage now but obvius I havn't.
Next step will be to clean everything and move model inside workshop again. Have some ideas that needs to be checked, will keep you updated. Will go to us within 2 weeks to visit ATHS truck show in MO, that will be a nice break.
I'm a little afraid to start another modeling project, I have already one decided but will try to stick with this one a little more.
Thanks again, will remember your comments when hands full of oil!
Dan

Re: D8R +463 in 1/5,6
 

Finally got some inspiration to start with the model again:o.
All connections between the valves and hydraulic motors replaced with new parts. Those banjos are little smaller making it possible to keep the bigger servos (the blue ones) for blade and ripper functions. All tubing had to be redone to, changing here to a little smaller diameters.
http://i1014.photobucket.com/albums/...psjyajk62w.jpg
Now remove and mount everything again, install lower oiltank, engine, pumps and outside oiltank (fueltank in 1:1). As you see, tracks and hubs removed to be able removing hydraulic motors. Have got a lot paint damages on frame, it was painted with 2 component paint, it's chipping. Guess something gone wrong with the primer, bare metal shown Most other part with 1 c paint with out problem:mad:
/dan

Re: D8R +463 in 1/5,6
 

Good to see some progress, Dan. I was wondering about this build the other day.

Re: D8R +463 in 1/5,6
 

Great to see you working on this again Dan. :cool:

Hopefully you've overcome some of the prior issues you had before & this model works they way you want it to now. :)

Re: D8R +463 in 1/5,6
 

how is it coming Dan? very curious how the solenoids are working out. I have an old t66 davis track ditch witch that could use some of this technology. I would like to convert it and make it autonomous with a flailing mower for steeper pasture ground.

Re: D8R +463 in 1/5,6
 

Sorry Wiskybilt, have no report from tests yet. Got another problem yesterday when remounting the return oilhose system, didn't fit. This due to the relocated valves. Will have to redo the connection to rear oiltank or find a smarter way to connect this tank to return system.
/dan

Re: D8R +463 in 1/5,6
 

I'll keep checking. Can you use hard line to create more space?

Re: D8R +463 in 1/5,6
 

Your right, checking now how to find alternative route for a 15mm pipe instead of hose. Thanks for all comments!

Re: D8R +463 in 1/5,6
 

New piping tested. There's low pressure on return side, that's why I use copper tubes instead of steel (easier to work/bend and bigger inside diameter).
Final adjustment today, then solder everything together :D
https://c1.staticflickr.com/1/503/17...a05fffe7_z.jpg20150602_201440 by DgS Persson, on Flickr

Re: D8R +463 in 1/5,6
 

Looking goood�� hope to see it moving some dirt for you real soon!

Re: D8R +463 in 1/5,6
 

Sloooooowwwwlyyyy coming together. One problem fixed results in another one!
Did find some small LED lamps that will be shortened and connected to wires instead of batteries.
http://i1014.photobucket.com/albums/...pscd6rw21n.jpg

Pressure hose 1/2" to long, have to get a new one tomorrow
http://i1014.photobucket.com/albums/...psy3nhkbdr.jpg

All cylinder heads reworked. Gasket was wrongly placed just inside cleaning gasket. Will now be inside head and not possible to pop out when cylinder comes in end position. Today it's seems so unlogical to place it where I did from start but still learning:o

Re: D8R +463 in 1/5,6
 

Glad to see it working out for you. Seems like your looking a little closer to the finish line. That alone can be rewarding and disappointing at the same time.

Re: D8R +463 in 1/5,6
 

A short update:
Did try out latest changes yesterday, only to discover some leaks in 2 of the cylinders connections. Honda engine did not run well either, felt very weak.
So still no dirt moving, will probably leave machine at a friend to investigate what's coursing the problems.
Dan

Re: D8R +463 in 1/5,6
 

Would that friend be in the United States?:bounce:

Re: D8R +463 in 1/5,6
 

Guess you would be happy then, but sorry to say, it will still be in Sweden.
If I/we get it up and running it would of course be a challange to send it over to us to parcitipate at some shows.