Caterpillar M322D wheel excavator (42043 C-model)




Wheeled excavator built just from 1 model parts (42043 Mercedes Benz), with many functions

2 functions transfered from base to superstructure through big turntable - steering and engine drive

manual functions:
HOG steering via beacon light
stabilizing legs (2 side on front, 1 working as shovel at back) operated with the same beacon light (not enough power to lift excavator :( )
gear for rotating superstructure
working 6piston inline engine driven by rear wheels + openable hood
handle to operate function of the attachment (*1 , *2)

motorized functions:
motorized pneumatic piston
battery box working as counterweight

pneumatic function:
4 pneumatic pistons raising boom, dipper and attachments

*1 grabber shovel
*2 pneumatic hammer
*3 big excavator bucket
*4 smaller excavator bucket
(all of them use smaller pneumatic piston, so it can't be built at the same time)

Superstructure bodywork inspired by official lego 42006

except 42043 model, you would need:
* 2 loom bands (front stabilizing legs operation)
* 4697b pneumatic T-Piece from 42043 spare parts

183 pages of generated instructions (A4 landscape orientation) for base, superstructure with boom, 4 attachments and tubing schema - sample on bricksafe
Suited for experienced builder!

3 downsides:
* not enough gears for front stabilizing legs operation so not enough power to lift excavator :(
* superstructure is heavy due to motor and battery box and is leaning towards left side
* boom is heavy, even though it is raised via 2 pneumatic pistons it takes time

function color mapping schema

orange x motorized pneumatic piston
dark blue x supersturcture rotation
azure blue x rear wheel engine drive
green x operation function of attachment
red x base functions operator
--------> gray steering
--------> pink stabilizing legs

See my other MOCs from 42043

If you're interested in models not released yet (bricksafe - Work In Progress models), PM me or comment here, I should reprioritize it's completition

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Name Caterpillar M322D wheel excavator (42043 C-model)
Designer klimax
Designed 2019
Inventory 1539 parts
Theme Technic
Alternate Build of 42043-1 Mercedes Benz Arocs 3245


  • 7 months ago nigel1975 Level 24 PRO
    Great alternative MOC with lots of play-ability in the combined functions and attachments. I see you've used ~55% of the parts, enough left to design a Shears attachment for demolition work :-)
    I like the renders and composite photos. Will definitely give the build a go in the future.
    • 7 months ago klimax Level 12 Designed this MOC
      I've havent thought about shears, it wasn't in CAT documentation book of attachments, but it's great addition ;)
      • 7 months ago nigel1975 Level 24 PRO
        I noted the shears on pg11 of this version of the M322D specs. I thought they would be a nice option for picking Lego up and, if enough force, to break them up e.g. some stacked bricks.
        • 7 months ago klimax Level 12 Designed this MOC
          Yes, that is the specs I took as an inspiration.
          Seems I haven't read it carefully, the small picture (on mobile phone) on pg 11 looks like shovel, so I missed it.
          Once I'll built this model again I would think of adding this attachment
  • 7 months ago Nico71 Level 20 MOC Designer DESIGNER
    Nice model !
    • 7 months ago klimax Level 12 Designed this MOC
      thanks for appreciation, from you as expert technic builder it means much to me
  • 7 months ago szymanski1991 Level 11
    Pretty impressive, pack so many functions on this small model. Impressive indeed. I must buy it one day.
    • 3 months, 4 weeks ago klimax Level 12 Designed this MOC
      you're welcome
      • 3 months, 4 weeks ago szymanski1991 Level 11
        Funny time to reply, I just finished the base and assemblind superstructure of this build :D
        • 3 months, 3 weeks ago klimax Level 12 Designed this MOC
          hope you'll like it, enjoy the build :)
  • 7 months ago Thewood Level 10
    Nice model! :) Edit:: it would be awesome to see a full rc version of this!
    • 7 months ago klimax Level 12 Designed this MOC
      unfortunately there is no space inside model to put there any other motor or receiver :(
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