Currently I'm bulding a Lego version of the Case Quadtrac 620 in 1:16. It's mainly built in Studio, but tested several mechanism to make sure things are working as expected. Haven't assembled everything yet, exept the tracks and an early version of the rear frame. I'll likely build it after i finished organising my lego parts (haven't done that for years).

Here you can find some early sketches from 2008. Since then (and after a long dark age) quite a lot has changed. Even during the last couple of weeks. For a quick impression, this is the current state:

 

Here you can see some more rendered images and screenshots.

My goal is to get as close as possible to the original. That includes function, geometry and look. Planned and partially done is the following:

• Remote controlled with two SBricks and powered by Legos rechargeable battery box
• Driven by one or two large motors (hard coupled), speed should match 1:16 of the original max speed (40km/h)
• Steering done with two small actuators and controlled with one large motor (mainly because of the many pin holes for connecting it to the frame)
• Suspended cabin
• Front light
• Openable bonnet
• Authentic connection between front and rear unit, means no turn table
• Oscillation between rear and front unit
• PTO driven by one medium motor located in the front unit
• 3-point hitch lifted by two small pneumatic
• Motorized compressor (Mini Motor 71427, located in the rear unit ) for 3-point hitch
• Motorized switch (medium motor, located in the rear unit) for 3-point hitch
• Realistically oscillating tracks
• Spring-supported track tensioner
• Suspended rollers (these three rollers in the middle)
• Optional: Full lightning like the original
• Optional: Maybe a gearbox, but I'm afraid there will be no space left

One of the challenges is to fit everything inside the frame, which is 9 studs wide. That leaves 7 studs.

Questions, comments and criticism are more than welcome.

Edited October 8, 20204 yr by Andman
minor typos

Usage of black 40t gears will be pricey :)

Just now, M_longer said:

Usage of black 40t gears will be pricey :)

Usually I'm a "pure lego guy", but for these gears i would make an exception. I even consider to paint them, although it doesn't feel right.

I have made it very long ago (before PF) but tried to work with PF on such tracks...but those tracks are not so good for motorisation...I suggest you to use tracks from Liebherr (and big sprockets)...

I remember that black gears 40 and 16 cost (more than 15 years ago) a small fortune.

Good luck

This is my version

http://www.brickshelf.com/cgi-bin/gallery.cgi?f=365319

7 minutes ago, I_Igor said:

I have made it very long ago (before PF) but tried to work with PF on such tracks...but those tracks are not so good for motorisation...I suggest you to use tracks from Liebherr (and big sprockets)...

Your are right, especially when it comes to flat surfaces. But on carpet it works fine. At the beginning i also had issue with vibrations and the track popping of the big turntable. The first problem i solved by moving one of the tracks by one "unit". After that it ran much smoother. I can explain it in details with pictures, if you like. The second issue was solved by just carefully alligning al the gears and adding a track tensioner.

Edited September 2, 20204 yr by Andman

Hi,

I struggle with making a diff between my parts I won and the parts I need for the model. I put all my sets into a set list on rebrickable. From Studio I can create a wanted list on bricklink. But how can I now get a diff between both? Could someone help me out or put me into the right direction?

Somebody in a another forum pointed me to custom lists on rebrickable.com. Just upload a parts list or other supported files. When the list is created you can click on build, which generates a list of missing peaces based on your inventory.

Here is the current state. The bonnet is really hard to replicate with all the curves.

Been long time since you last posted, good looking anyway. and yes bonet is pain to replicate

I mostly post in the german forum because i get more likes ;-D but seriously. Had a break and didn't really know where to start with the bonnet. I'll try to post here more frequently.

After a long necessary break, i'm finally back with a more or less fresh mind and the necessary creativity to proceed with my Quadtrac. I have been busy building in Studio and will order the missing parts soon to build it.

Here is the current state:

Video

 

Edited November 30, 20213 yr by Andman
added video

Wow.. I'm a tractor man so fully appreciate this moc as i'm very familiar with the quadtrac. A gorgeous model.

Thanks @TeamThrifty :-) I hope it also work as expected.

Oh yes, that is what you like to see. It's looking truly beautiful. Functional AND studfull > studless forever and ever.

11 hours ago, arieben said:

Functional AND studfull > studless forever and ever.

Thanks! The inside is made studless. I don't prefer one over the other. I just use the advantages of both worlds.

Added side grill and improved the bonnet a bit. The lower line looks no a little cleaner. Hard to close the little gaps.